Date   
Re: [4SQRP] Hilltopper mods - 'how to get them'

Dave Benson
 

Thanks, Brian!

I was portable for the afternoon CWT sprint yesterday- 17 contacts on 20 and 40M. The ground's bare on south-facing slopes but still a foot of snow in the shade.

It's still a bit early for outdoor ops here in NH, but you take opportunities when they arise. Upper 50s and mostly sunny when I set up. It was down to 50F, overcast and winds gusting 35 by the time I packed up.
 
73- Dave, K1SWL


On Thu, Apr 4, 2019 at 7:47 AM KB9BVN - <kb9bvn@...> wrote:
Dave, 

Thank you very much for doing this.  I already loved my HT20 but after the mods, it's even better.  

Indiana Fireflies QRP Group met for Pizza last night and we were talking about how great the 4 States kits have been.

Outdoor Ops Season is almost here in Indiana....where it's 70 today and snowing tomorrow. 

Every day can be field day! 

de KB9BVN
Brian Murrey



On Thu, Apr 4, 2019 at 5:40 AM Dave Benson <davek1swl@...> wrote:
folks-

At this point, I've shipped all but two mod sets for the Hilltopper. Parts are due in today and then I can ship those.  About 20 sets have gone out.

I was surprised to discover that most of the padded mailers shipped as 'large envelope' rather than 'parcel'. That put the postage cost at $1.00 instead of almost $4.  Feel free to email me directly (below) to request a refund of the overage. Otherwise, consider it a contribution to my 'project fund'. I won't mind.

73- Dave Benson, K1SWL
davek1swl at gmail.com

---------- Forwarded message ---------
From: Dave Benson via Groups.Io <davek1swl=gmail.com@groups.io>
Date: Mon, Mar 25, 2019 at 4:28 PM
Subject: [4SQRP] Hilltopper mods - 'how to get them'
To: <main@4sqrp.groups.io>, <HilltopperKit@4sqrp.groups.io>


gang-

As my original post mentioned, fixes 1) and 2) are free for the asking.

Please contact me directly for these:   davek1swl at gmail.com
-----------------------
The price for all three is $7 via Paypal (A check's fine too)  The big difference is the need for a padded mailer, po$tage and Paypal fee- those alone add up to $5.

For this flavor:  Paypal to my e-mail address above.
-----------------------

I'll be able to ship later this week- I've just reordered parts

73- Dave, K1SWL



--
73 de KB9BVN
Brian Murrey

Re: [4SQRP] Hilltopper mods - 'how to get them'

KB9BVN - <kb9bvn@...>
 

Dave, 

Thank you very much for doing this.  I already loved my HT20 but after the mods, it's even better.  

Indiana Fireflies QRP Group met for Pizza last night and we were talking about how great the 4 States kits have been.

Outdoor Ops Season is almost here in Indiana....where it's 70 today and snowing tomorrow. 

Every day can be field day! 

de KB9BVN
Brian Murrey



On Thu, Apr 4, 2019 at 5:40 AM Dave Benson <davek1swl@...> wrote:
folks-

At this point, I've shipped all but two mod sets for the Hilltopper. Parts are due in today and then I can ship those.  About 20 sets have gone out.

I was surprised to discover that most of the padded mailers shipped as 'large envelope' rather than 'parcel'. That put the postage cost at $1.00 instead of almost $4.  Feel free to email me directly (below) to request a refund of the overage. Otherwise, consider it a contribution to my 'project fund'. I won't mind.

73- Dave Benson, K1SWL
davek1swl at gmail.com

---------- Forwarded message ---------
From: Dave Benson via Groups.Io <davek1swl=gmail.com@groups.io>
Date: Mon, Mar 25, 2019 at 4:28 PM
Subject: [4SQRP] Hilltopper mods - 'how to get them'
To: <main@4sqrp.groups.io>, <HilltopperKit@4sqrp.groups.io>


gang-

As my original post mentioned, fixes 1) and 2) are free for the asking.

Please contact me directly for these:   davek1swl at gmail.com
-----------------------
The price for all three is $7 via Paypal (A check's fine too)  The big difference is the need for a padded mailer, po$tage and Paypal fee- those alone add up to $5.

For this flavor:  Paypal to my e-mail address above.
-----------------------

I'll be able to ship later this week- I've just reordered parts

73- Dave, K1SWL



--
73 de KB9BVN
Brian Murrey

[4SQRP] Hilltopper mods - 'how to get them'

Dave Benson
 

folks-

At this point, I've shipped all but two mod sets for the Hilltopper. Parts are due in today and then I can ship those.  About 20 sets have gone out.

I was surprised to discover that most of the padded mailers shipped as 'large envelope' rather than 'parcel'. That put the postage cost at $1.00 instead of almost $4.  Feel free to email me directly (below) to request a refund of the overage. Otherwise, consider it a contribution to my 'project fund'. I won't mind.

73- Dave Benson, K1SWL
davek1swl at gmail.com

---------- Forwarded message ---------
From: Dave Benson via Groups.Io <davek1swl=gmail.com@groups.io>
Date: Mon, Mar 25, 2019 at 4:28 PM
Subject: [4SQRP] Hilltopper mods - 'how to get them'
To: <main@4sqrp.groups.io>, <HilltopperKit@4sqrp.groups.io>


gang-

As my original post mentioned, fixes 1) and 2) are free for the asking.

Please contact me directly for these:   davek1swl at gmail.com
-----------------------
The price for all three is $7 via Paypal (A check's fine too)  The big difference is the need for a padded mailer, po$tage and Paypal fee- those alone add up to $5.

For this flavor:  Paypal to my e-mail address above.
-----------------------

I'll be able to ship later this week- I've just reordered parts

73- Dave, K1SWL
_._,_._,_

Hilltopper mods - 'how to get them'

Dave Benson
 

gang-

As my original post mentioned, fixes 1) and 2) are free for the asking.

Please contact me directly for these:   davek1swl at gmail.com
-----------------------
The price for all three is $7 via Paypal (A check's fine too)  The big difference is the need for a padded mailer, po$tage and Paypal fee- those alone add up to $5.

For this flavor:  Paypal to my e-mail address above.
-----------------------

I'll be able to ship later this week- I've just reordered parts

73- Dave, K1SWL

Re: Hilltopper Mods

Charles W. Powell
 

Dave,

The chip is a ‘drop in’ replacement for the current chip?  Send me one and I will send you the cost by PayPal.  Looks to me like both mods, 6 dB + 6 dB makes 12 dB all together.  That should turn the RF gain down considerably!

I’ve already done the sidetone mod, and it is great.

Another side note: I don’t know why, but with changing the center frequency and sidetone to 600 Hz, I don’t note any loss.  In fact, if the station is offset to 800 Hz, I note it to be quite a bit down from moving it to my center frequency.  I used the Hilltopper 40 exclusively while I was out of town last week so I had time to get some empiric data on performance.

Let us know the total cost for the chip and postage.  Throw in R5 and C22 and I’ll replace those in as well.

72,

Chas - NK8O

On Mar 24, 2019, at 5:22 AM, Dave Benson <davek1swl@...> wrote:

Folks-

Here are several easy mods to improve Hilltopper performance. They address audio levels and quality.

1)   'Loud sidetone':

The value of R8  (now 22k) can be increased to 47K to 100K.  (This change has been posted before, but it's worth including in this summary )

2) 'Low audio'  

The values of R5 (150K) and C22 (470 pF) may be changed to 330K and 220 pF respectively.  This yields a gain increase of 6 dB without affecting that stage's rolloff characteristic.

These two components are in 'tight quarters'- between U3 and the pushbutton switch.  Cutting one or both component leads and tacking the new components on the underside of the board makes the change much easier. 

 But wait- there's more!......

As some of you have noted, there's a 'screech' on loud CW signals- it necessitates riding the gain control. I evaluated samples of a more robust op-amp-  the NJM4556AD.

3) Replacing the NE5532P with that new device eliminates the screech. You'll hear some distortion when limiting occurs, but it's much less objectionable than the NE5532's rude noises. Its 'limiting' threshold is also about 6 dB higher than the present device.  The net result of this change, combined with 2) above,  is 6 dB more audio without the rudities (that's a word!).

Note that if you increase the gain without replacing the IC, you'll find yourself riding the gain control more often
------------------------------------------------
Here's the deal:

If you'd like parts for fixes 1) and 2), simply send me your address and I'll drop them in the mail to you.

I can provide the NJM4556AD as well, but I'd need to charge for it at my cost.  Most of that is postage- nearly $4 for a 'non-flat' mailing these days.   This part is also readily available through Digikey and Mouser.

73- Dave Benson, K1SWL
email: davek1swl at gmail.com

Hilltopper Mods

Dave Benson
 

Folks-

Here are several easy mods to improve Hilltopper performance. They address audio levels and quality.

1)   'Loud sidetone':

The value of R8  (now 22k) can be increased to 47K to 100K.  (This change has been posted before, but it's worth including in this summary )

2) 'Low audio'  

The values of R5 (150K) and C22 (470 pF) may be changed to 330K and 220 pF respectively.  This yields a gain increase of 6 dB without affecting that stage's rolloff characteristic.

These two components are in 'tight quarters'- between U3 and the pushbutton switch.  Cutting one or both component leads and tacking the new components on the underside of the board makes the change much easier. 

 But wait- there's more!......

As some of you have noted, there's a 'screech' on loud CW signals- it necessitates riding the gain control. I evaluated samples of a more robust op-amp-  the NJM4556AD.

3) Replacing the NE5532P with that new device eliminates the screech. You'll hear some distortion when limiting occurs, but it's much less objectionable than the NE5532's rude noises. Its 'limiting' threshold is also about 6 dB higher than the present device.  The net result of this change, combined with 2) above,  is 6 dB more audio without the rudities (that's a word!).

Note that if you increase the gain without replacing the IC, you'll find yourself riding the gain control more often
------------------------------------------------
Here's the deal:

If you'd like parts for fixes 1) and 2), simply send me your address and I'll drop them in the mail to you.

I can provide the NJM4556AD as well, but I'd need to charge for it at my cost.  Most of that is postage- nearly $4 for a 'non-flat' mailing these days.   This part is also readily available through Digikey and Mouser.

73- Dave Benson, K1SWL
email: davek1swl at gmail.com

Re: Hilltopper 40 Power Out at 12 VDC

KB9BVN - <kb9bvn@...>
 

This is a fun and very learned group..I learn more every day I am here. 

de KB9BVN


On Thu, Mar 14, 2019 at 9:17 AM Dave Benson <davek1swl@...> wrote:
re class-C vs class E

There's another straightforward way to tell...by looking at the schematic.

The components on a class-E amplifier's collector/drain circuit should be resonant at the operating frequency. This primarily includes the collector/drain's RF choke and a capacitor to ground. (The PA device's output capacitance also needs to be factored in. )

If there's a capacitor to ground on the PA drain/collector, chances are good it's designed for class-E.

73-Dave

On Thu, Mar 14, 2019 at 6:18 AM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
OT I know.

Still looking for a Palm Pico Paddle.  Thought one of the listeners here might have one to sell.

Thank you.

Dave K8WPE. Djwilcox01 at gmail dot com

David J. Wilcox K8WPE’s iPad

On Mar 13, 2019, at 11:02 PM, Charles W. Powell via Groups.Io <doctorcwp@...> wrote:

Oh good.  Some more fun with the scope!

72,

Chas - NK8O

On Mar 13, 2019, at 8:30 PM, WA0ITP <wa0itp@...> wrote:

Correct!  Put your scope probe on the collector of the finals  If it is in Class E, You should see only positive rectangular pulses, such as the ones below.  The LPF filters out the harmonics making it sign wave. 

Dave has mentioned that the HT runs in Class C.  The second graph below show most classes and their conduction angles.  Class C is sinusoidal but is biased off for most of the cycle.  It can be very efficient too.

<oamobnajgjncnmhh.dib>


<nobdbcoledmglenc.png>
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 3/13/2019 6:32 PM, Charles W. Powell via Groups.Io wrote:
Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF








--
73 de KB9BVN
Brian Murrey

Re: Hilltopper 40 Power Out at 12 VDC

Dave Benson
 

re class-C vs class E

There's another straightforward way to tell...by looking at the schematic.

The components on a class-E amplifier's collector/drain circuit should be resonant at the operating frequency. This primarily includes the collector/drain's RF choke and a capacitor to ground. (The PA device's output capacitance also needs to be factored in. )

If there's a capacitor to ground on the PA drain/collector, chances are good it's designed for class-E.

73-Dave


On Thu, Mar 14, 2019 at 6:18 AM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
OT I know.

Still looking for a Palm Pico Paddle.  Thought one of the listeners here might have one to sell.

Thank you.

Dave K8WPE. Djwilcox01 at gmail dot com

David J. Wilcox K8WPE’s iPad

On Mar 13, 2019, at 11:02 PM, Charles W. Powell via Groups.Io <doctorcwp@...> wrote:

Oh good.  Some more fun with the scope!

72,

Chas - NK8O

On Mar 13, 2019, at 8:30 PM, WA0ITP <wa0itp@...> wrote:

Correct!  Put your scope probe on the collector of the finals  If it is in Class E, You should see only positive rectangular pulses, such as the ones below.  The LPF filters out the harmonics making it sign wave. 

Dave has mentioned that the HT runs in Class C.  The second graph below show most classes and their conduction angles.  Class C is sinusoidal but is biased off for most of the cycle.  It can be very efficient too.

<oamobnajgjncnmhh.dib>


<nobdbcoledmglenc.png>
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 3/13/2019 6:32 PM, Charles W. Powell via Groups.Io wrote:
Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF






Re: Hilltopper 40 Power Out at 12 VDC

David Wilcox <Djwilcox01@...>
 

OT I know.

Still looking for a Palm Pico Paddle.  Thought one of the listeners here might have one to sell.

Thank you.

Dave K8WPE. Djwilcox01 at gmail dot com

David J. Wilcox K8WPE’s iPad

On Mar 13, 2019, at 11:02 PM, Charles W. Powell via Groups.Io <doctorcwp@...> wrote:

Oh good.  Some more fun with the scope!

72,

Chas - NK8O

On Mar 13, 2019, at 8:30 PM, WA0ITP <wa0itp@...> wrote:

Correct!  Put your scope probe on the collector of the finals  If it is in Class E, You should see only positive rectangular pulses, such as the ones below.  The LPF filters out the harmonics making it sign wave. 

Dave has mentioned that the HT runs in Class C.  The second graph below show most classes and their conduction angles.  Class C is sinusoidal but is biased off for most of the cycle.  It can be very efficient too.

<oamobnajgjncnmhh.dib>


<nobdbcoledmglenc.png>
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 3/13/2019 6:32 PM, Charles W. Powell via Groups.Io wrote:
Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF






Re: Hilltopper 40 Power Out at 12 VDC

Charles W. Powell
 

Oh good.  Some more fun with the scope!

72,

Chas - NK8O

On Mar 13, 2019, at 8:30 PM, WA0ITP <wa0itp@...> wrote:

Correct!  Put your scope probe on the collector of the finals  If it is in Class E, You should see only positive rectangular pulses, such as the ones below.  The LPF filters out the harmonics making it sign wave. 

Dave has mentioned that the HT runs in Class C.  The second graph below show most classes and their conduction angles.  Class C is sinusoidal but is biased off for most of the cycle.  It can be very efficient too.

<oamobnajgjncnmhh.dib>


<nobdbcoledmglenc.png>
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 3/13/2019 6:32 PM, Charles W. Powell via Groups.Io wrote:
Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF






Re: Hilltopper 40 Power Out at 12 VDC

WA0ITP
 

Correct!  Put your scope probe on the collector of the finals  If it is in Class E, You should see only positive rectangular pulses, such as the ones below.  The LPF filters out the harmonics making it sign wave. 

Dave has mentioned that the HT runs in Class C.  The second graph below show most classes and their conduction angles.  Class C is sinusoidal but is biased off for most of the cycle.  It can be very efficient too.




72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 3/13/2019 6:32 PM, Charles W. Powell via Groups.Io wrote:

Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF





Re: Hilltopper 40 Power Out at 12 VDC

prose062
 

I built a HT 40 in January for someone else.  I tested it at 4.8 watts on 12.0 volts, and 5.1 watts on 12.7 volts.  Output was clean, 2nd harmonic measured 46 dB down from carrier.  May vary a bit from build to build.

Paul - K0EET 

On Thu, Mar 7, 2019 at 6:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF

Re: Hilltopper 40 Power Out at 12 VDC

Charles W. Powell
 

Question:  Can one tell from the waveform of the output of the BS170s what class amplifier is in operation?  If I understand correctly, Class E would show only a series of pulses, whereas class C would show a “round topped” upright square wave.

Any guru comments on this?

72,

Chas - NK8O

On Mar 8, 2019, at 4:25 AM, Dave Benson <davek1swl@...> wrote:

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL

On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF




Re: Hilltopper 40 Power Out at 12 VDC

Dave Benson
 

Stan-

Good question!  (and nice going on all the kit building)

There shouldn't be much difference in power output between the two bands. There's plenty of drive from the paralleled logic gates. As a result, the PA devices should be in saturation either way.  As an aside, I'd heard from someone who tried the scheme on 50 MHz. He got 4W out.

From what I've heard, the QCX may be more prone to low power output. I don't know if that's a common occurence, though.  The QCX is configured for class-E but the component values don't make sense to me.  In the case of the Hilltopper, I was concerned about peak voltages (4*Vcc) and tolerance stack-ups. As a result, the Hilltopper runs class-C and not class-E.

73- Dave, K1SWL


On Thu, Mar 7, 2019 at 8:45 PM StanWB2LQF <sjl219@...> wrote:

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF

Re: Hilltopper 40 Power Out at 12 VDC

Charles W. Powell
 

Interesting that someone should ask.  I just put mine on a variable power supply and it didn’t seem to fall off from 5 watts until it hit 11.5v.  But going up didn’t change it much either.  I had just finished testing a QCX (20) and I wanted to see how they compared.  The QCX showed a definite change but the Hilltopper did not.

72,

Chas - NK8O

On Mar 7, 2019, at 7:58 PM, AG1P Ron <ag1p@...> wrote:

There is a post on second page of the Messages titled Hilltopper 40 Performance. Several indicated just over 5W @ 12 volts. That was also my experience. Other members can add their experiences as well.
 
72 - Ron - AG1P
4SQRP Volunteer Moderator
 
From: HilltopperKit@4SQRP.groups.io [mailto:HilltopperKit@4SQRP.groups.io] On Behalf Of StanWB2LQF
Sent: Thursday, March 07, 2019 3:49 PM
To: HilltopperKit@4SQRP.groups.io
Subject: [HilltopperKit] Hilltopper 40 Power Out at 12 VDC
 

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF


Re: Hilltopper 40 Power Out at 12 VDC

AG1P Ron
 

There is a post on second page of the Messages titled Hilltopper 40 Performance. Several indicated just over 5W @ 12 volts. That was also my experience. Other members can add their experiences as well.

 

72 - Ron - AG1P

4SQRP Volunteer Moderator

 

From: HilltopperKit@4SQRP.groups.io [mailto:HilltopperKit@4SQRP.groups.io] On Behalf Of StanWB2LQF
Sent: Thursday, March 07, 2019 3:49 PM
To: HilltopperKit@4SQRP.groups.io
Subject: [HilltopperKit] Hilltopper 40 Power Out at 12 VDC

 

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF

Hilltopper 40 Power Out at 12 VDC

StanWB2LQF <sjl219@...>
 

I'm about to purchase a Hilltopper 40 but first I would like to know how close to 5 watts output I can get from 12 VDC?  I built five QCX transceivers and not one of them ever approached 5 watts on 12 VDC and they also use three BS170 transistors.

In fairness to QCX Labs, they do indeed specify that the QCX transceivers operate on approx 6 to 16 volts and, of course, output varies directly with voltage.

Followup question:  For whatever power out 12 VDC provides for the Hilltopper 40 should I assume it will be EQUAL or LOWER for the Hilltopper 20?

Thanks in advance for some enlightenment; I'm a new group member.

72, Stan WB2LQF

Re: Ham Radio Deluxe interface

Charles W. Powell
 

It even works to the point of taking input frequencies as well.  RumLogNG has a feature in which one can input the frequency in the “Call Sign” box and hit Enter.  It updates the frequency perfectly on the radio.  Kudos not only to Lloyd for a wonderful bit of code but also to Dave for a great radio design.

Chas - NK8O

On Mar 3, 2019, at 12:18 PM, Charles W. Powell via Groups.Io <doctorcwp@...> wrote:

Well Lloyd, I've discovered that the with RumLogNG (Mac OS X) that the cat control will only read if I constantly refresh the serial port.  BUT - if I set the radio as KX2, it not only updates but it is also instantaneous.  With the RIT engaged, the VFO 2 update is INSTANTANEOUS.   So again, your little bit of code is absolutely marvelous.

72,

Chas - NK8O

P.S., Yes.  72 is the QRP version of 73 - for those who want to give the very least!

Re: Ham Radio Deluxe interface

Charles W. Powell
 

Well Lloyd, I've discovered that the with RumLogNG (Mac OS X) that the cat control will only read if I constantly refresh the serial port.  BUT - if I set the radio as KX2, it not only updates but it is also instantaneous.  With the RIT engaged, the VFO 2 update is INSTANTANEOUS.   So again, your little bit of code is absolutely marvelous.

72,

Chas - NK8O

P.S., Yes.  72 is the QRP version of 73 - for those who want to give the very least!

Re: ADV: Re: ADV: Re: ADV: Re: ADV: Re: ADV: Re: [HilltopperKit] Hilltopper 40 problem....HELP!!

jrdock@ckt.net
 

We live and learn Dave. Hi Hi


Pro

Jack R. Dock ... How about we give GOD a reason to continue blessing America?  In defense of America I pledge my life, my fortune and my sacred honor.
War does not determine who is right, only who is left.
                                                 

On Feb 28, 2019, at 6:30 AM, Dave Benson <davek1swl@...> wrote:

Jack-

That's the second upside-down Si5351 board I know of.  I fixed the first one, but I have to say- you did a better job on the rework than I did.

It's one of those things where the problem is glaringly obvious- AFTER it's pointed out to you.  I've embarked on a number of troubleshoots where I should have checked the simple things first!  Sometimes a case of  'it works better plugged in'.  I've learned to do a close visual inspection before firing up the test equipment. :-)

73 -Dave

On Wed, Feb 27, 2019 at 8:47 PM jrdock@... <jrdock@...> wrote:
I think you are right Jim.  It just bothered me that I had looked at it for several weeks and never really looked at it!  Took me about a half hour to get that little jewel out.  Used a bamboo skewer to walk it out.  Heat one side then the other till it came off then cleaned the holes turned it over and resoldered it.

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Pro

Jack R. Dock ... How about we give GOD a reason to continue blessing America?  In defense of America I pledge my life, my fortune and my sacred honor.
War does not determine who is right, only who is left.
                                                 

On Feb 27, 2019, at 7:12 PM, Charles W. Powell via Groups.Io <doctorcwp@...> wrote:

Easy to do Jack.  I recently built an audio pre-amp that I put one of the ICs in the wrong place.  Managed to get it out cleanly with a lot of patience but it wasn’t something that was going to be chalked up to a cheap mistake.  Darned thing cost too much for that.  I bet there’s not a builder here that hasn’t put something in the wrong spot, upside down, backward, or what-have-you.  Well, 95%.  The other 5% aren’t telling the truth?

72,

Chas - NK8O

On Feb 27, 2019, at 5:30 PM, jrdock@... wrote:

OK Jim here goes .... I had been looking at this thing for 3 weeks trying to see what was wrong.  We had our builders club meeting and Joe (W0MQY) was working on his HT-40 so Bill (WB0LXZ) offered to help me trouble shoot.  Bill wasn’t really all that familiar with the kit but was very good with schematics.  We checked all of the voltages and so on and everything was checking out but it still wouldn’t work.  Gave up for the evening and a couple of days later I was talking to Joe and he said his 40 was working great.  He offered to take a look at mine and see what he could do with the scope.  I said I would be right over, warm up the scope.  Got over there and he took one look at the board and he said “I know what’s wrong with it”.  I said “ how’s that?”  He said “you’re Si5351 board Is is upside down”.
Moral of the story, Always read the directions even if you have built one before that works and a fresh pair of eyes never hurts.  Never get to old to learn.
So if someone tells you all the voltages check on the schematic and all the parts are in the right place tell them to turn over the Si5351 board!  Hi Hi

Jack .... WD0CFH

Pro

Jack R. Dock ... How about we give GOD a reason to continue blessing America?  In defense of America I pledge my life, my fortune and my sacred honor.
War does not determine who is right, only who is left.
                                                 

On Feb 27, 2019, at 2:31 PM, Dave Benson <davek1swl@...> wrote:

Jack-

That's great news- thanks for letting us know!  I don't think either Jim Pruett or I will make Ozarkcon, so feel free to share anytime it's convenient.
.
73- Dave, K1SWL


On Wed, Feb 27, 2019 at 1:11 PM jrdock@... <jrdock@...> wrote:
Good news Dave, got it fixed and every thing is working great.  Joe Porter (W0MQY) found the problem.  I will tell you what happened at OzarkCon ......🤫
Jack ... WD0CFH