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Re: How much TX Power allowed into a MagicBox T/R Switch?

Jim Kortge
 



On 11/10/2019 2:11 AM, qrper72@... wrote:

Hello,

I'd like to use a tube transmitter with an old tube professional receiver.
Well I want to switch T/R smoothly with using my MagicBox. I wonder how much power is allowed. Someone says that the maximum input power is 10W and the other one says 5W. Is there specification?

ja9mat Hidehiko.

Greetings Hidehiko San,

The MagicBox can handle 10 watts safely, but not a lot more.  I've never tested it above 10 watts, so don't know at what power level the smoke starts to come out of it!  :-)

Have fun with your tube gear.

72/73,

Jim, K8IQY
Re: Murania Radio Low Audio Outout

Johnny AC0BQ
 

The mods are listed in the Miranda Sub group.
72
Johnny AC0BQ 

On Sun, Nov 10, 2019 at 9:21 AM Johnny Matlock via Groups.Io <jomatlock=gmail.com@groups.io> wrote:
Gm guys
My audio was quite low until I did the 
Mod that was posted on the group.
It performs a lot better now.
72
Johnny AC0BQ 

On Sun, Nov 10, 2019 at 9:17 AM Charles W. Powell via Groups.Io <doctorcwp=yahoo.com@groups.io> wrote:
Curt,

I never set my Murania up in the stock format, but rather did the mod to make it into a regenerative receiver.  I don’t find the volume room filling that way, but with the radio nearby it has adequate audio.  Search the forum for the mods to the radio.  Either way, I think the audio volume is somewhat limited.  With the regen mod, the volume range is greatly limited but I’m told it’s louder.  Someone correct me if I am wrong.

73,

Charles - NK8O

On Nov 9, 2019, at 10:41 PM, Curt M. <WU3URADIO@...> wrote:

[Edited Message Follows]

Hi guys, I finished Murania the other day and the speaker the output is really low. I double checked all the the components and everything seems fine. It wasn’t specified if +/- on the speaker had to go on any specific terminals on the secondary of the transformer but I suspect they don’t.

I was expecting that just like with my older transistor radios I would be able to set this on the counter and listen to the baseball games in the summer. I pretty much have to hold the radio within a foot of my head to make it out well. I adjusted the loop for the best sound and my battery is new. I may be able to put a small audio amplifier in the same case but before I do that I wanted to see if this is what everyone else has experienced? It was a fun kit to build but I’m disappointed in the speaker output.  I may not have built it if I knew it was going to be this low.  


Maybe the audio transformer is defective. The manual had me primed for loud audio being that they tell you to set the volume at 50% while testing. Volume at 50% on my radio is nearly impossible to hear. 


Curt M.


--
Check out the 4SQRP website at 4sqrp.com

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Check out the 4SQRP website at 4sqrp.com
Re: Murania Radio Low Audio Outout

Johnny AC0BQ
 

Gm guys
My audio was quite low until I did the 
Mod that was posted on the group.
It performs a lot better now.
72
Johnny AC0BQ 

On Sun, Nov 10, 2019 at 9:17 AM Charles W. Powell via Groups.Io <doctorcwp=yahoo.com@groups.io> wrote:
Curt,

I never set my Murania up in the stock format, but rather did the mod to make it into a regenerative receiver.  I don’t find the volume room filling that way, but with the radio nearby it has adequate audio.  Search the forum for the mods to the radio.  Either way, I think the audio volume is somewhat limited.  With the regen mod, the volume range is greatly limited but I’m told it’s louder.  Someone correct me if I am wrong.

73,

Charles - NK8O

On Nov 9, 2019, at 10:41 PM, Curt M. <WU3URADIO@...> wrote:

[Edited Message Follows]

Hi guys, I finished Murania the other day and the speaker the output is really low. I double checked all the the components and everything seems fine. It wasn’t specified if +/- on the speaker had to go on any specific terminals on the secondary of the transformer but I suspect they don’t.

I was expecting that just like with my older transistor radios I would be able to set this on the counter and listen to the baseball games in the summer. I pretty much have to hold the radio within a foot of my head to make it out well. I adjusted the loop for the best sound and my battery is new. I may be able to put a small audio amplifier in the same case but before I do that I wanted to see if this is what everyone else has experienced? It was a fun kit to build but I’m disappointed in the speaker output.  I may not have built it if I knew it was going to be this low.  


Maybe the audio transformer is defective. The manual had me primed for loud audio being that they tell you to set the volume at 50% while testing. Volume at 50% on my radio is nearly impossible to hear. 


Curt M.


--
Check out the 4SQRP website at 4sqrp.com
Re: Murania Radio Low Audio Outout

Charles W. Powell
 

Curt,

I never set my Murania up in the stock format, but rather did the mod to make it into a regenerative receiver.  I don’t find the volume room filling that way, but with the radio nearby it has adequate audio.  Search the forum for the mods to the radio.  Either way, I think the audio volume is somewhat limited.  With the regen mod, the volume range is greatly limited but I’m told it’s louder.  Someone correct me if I am wrong.

73,

Charles - NK8O

On Nov 9, 2019, at 10:41 PM, Curt M. <WU3URADIO@...> wrote:

[Edited Message Follows]

Hi guys, I finished Murania the other day and the speaker the output is really low. I double checked all the the components and everything seems fine. It wasn’t specified if +/- on the speaker had to go on any specific terminals on the secondary of the transformer but I suspect they don’t.

I was expecting that just like with my older transistor radios I would be able to set this on the counter and listen to the baseball games in the summer. I pretty much have to hold the radio within a foot of my head to make it out well. I adjusted the loop for the best sound and my battery is new. I may be able to put a small audio amplifier in the same case but before I do that I wanted to see if this is what everyone else has experienced? It was a fun kit to build but I’m disappointed in the speaker output.  I may not have built it if I knew it was going to be this low.  


Maybe the audio transformer is defective. The manual had me primed for loud audio being that they tell you to set the volume at 50% while testing. Volume at 50% on my radio is nearly impossible to hear. 


Curt M.
Re: How much TX Power allowed into a MagicBox T/R Switch?

Johnny AC0BQ
 

Gm Hide 
Here is a link to the manual.
It’s says 10 watts.
I would be more concerned about the keying voltage of the tube type transmitter that may be too high?
72
Johnny AC0BQ 


On Sun, Nov 10, 2019 at 7:31 AM <qrper72@...> wrote:

Hello,

I'd like to use a tube transmitter with an old tube professional receiver.
Well I want to switch T/R smoothly with using my MagicBox. I wonder how much power is allowed. Someone says that the maximum input power is 10W and the other one says 5W. Is there specification?

ja9mat Hidehiko.

--
Check out the 4SQRP website at 4sqrp.com
Re: Great CW operating article

n4mj
 

John, VE3IPS, I agree - FT8 is NOT ham radio...  Can see that it might be useful for "coordinated" propagation studies by designated researchers/organizations but it is NOT ham radio.
73 de n4mj//glenn


 
“PLEASE REMOVE all email addresses before you send it on and use BCC option when forwarding"
  Thank you! 



On Sunday, November 10, 2019, 07:31:59 AM CST, John <ve3ips@...> wrote:


Thanks Doc for this article as I think FT8 isnt ham radio
John ve3ips
--
Sent with a Palm Pilot. Ve3ips.wordpress.com
Radio: it's not just a hobby, it's a way of life
All content is personal and confidential
Re: Great CW operating article

John
 

Thanks Doc for this article as I think FT8 isnt ham radio
John ve3ips
--
Sent with a Palm Pilot. Ve3ips.wordpress.com
Radio: it's not just a hobby, it's a way of life
All content is personal and confidential
How much TX Power allowed into a MagicBox T/R Switch?

Hidehiko Komachi - JA9MAT
 

Hello,

I'd like to use a tube transmitter with an old tube professional receiver.
Well I want to switch T/R smoothly with using my MagicBox. I wonder how much power is allowed. Someone says that the maximum input power is 10W and the other one says 5W. Is there specification?

ja9mat Hidehiko.
Murania Radio Low Audio Outout

Curt M.
 
Edited

Hi guys, I finished Murania the other day and the speaker the output is really low. I double checked all the the components and everything seems fine. It wasn’t specified if +/- on the speaker had to go on any specific terminals on the secondary of the transformer but I suspect they don’t.

I was expecting that just like with my older transistor radios I would be able to set this on the counter and listen to the baseball games in the summer. I pretty much have to hold the radio within a foot of my head to make it out well. I adjusted the loop for the best sound and my battery is new. I may be able to put a small audio amplifier in the same case but before I do that I wanted to see if this is what everyone else has experienced? It was a fun kit to build but I’m disappointed in the speaker output.  I may not have built it if I knew it was going to be this low.  


Maybe the audio transformer is defective. The manual had me primed for loud audio being that they tell you to set the volume at 50% while testing. Volume at 50% on my radio is nearly impossible to hear. 


Curt M.
Nouveau 75 First QSO

Curt M.
 

Hi guys, while I don’t have the best antenna setup for 75m I put together the Nouveau 75 and I’ve been calling CQ off and on over the last few evenings. Tonight a station came back to me!  The other station was about 130 miles away and I had a few minute QSO with them. He said my signal wasn’t real strong but the audio sounded fine. 

I’m just using a home built end fed antenna 44’ long and only 10’ off the ground so that’s saying something for his station and the output on the Nouveau 75. Surprisingly when I told him I was using a 20w PEP kit radio he called the radio by name so evidently the word is getting out about this radio. 

Just figured I would post of my success with the radio for anyone else that hasn’t been heard yet using their Nouveau 75. 


Curt M.
Portable QRP gear for sale

Ray Cadmus
 

Downsize time...  My old legs tell me to start with some portable stuff.  I'm afraid my portable operating is in the past. I have an idea of the value of most of this equipment but how does one put a price on homebrew.  Anyway - make an offer on whatever takes your fancy.
 
Photos available - email requests to rcadmus@...
 
Elecraft K1 - 4 band - 40, 30, 20 & 15 - extended vfo range - no antenna tuner
 
SmallWonders PSK-20
 
Small Dell netbook running Linux used for fldigi with PSK-20
 
KD1JV Mountain Topper 40/20 in custon pcb case
 
Scorpian mini keyer
 
4sqrp tenna-dipper
 
end fed 1/2 wave tuner
 
A plastic case for those last 4 items courtesy of the grocery deli section.
 
PAC-12 antenna's (2) One commercial, one homemade in a plastic tool case. (no phasing harness)
 
Homemade buddy-pole/buddy stick in a custom wooden case. Includes tri-pod for stick use.
 
Regards,
Ray W9EUM (former W0PFO) Springfield, MO
 
 
 
Re: Great CW operating article

Charles Wells
 

Thanks for posting this article.  As a budding CW operator trying to accumulate the courage to make the first qso I really appreciate it.  Although the article is several months younger than me, I've come to amateur radio only recently.  Many thanks
73/72
Chas AD0UY

On Sat, Nov 9, 2019, 08:46 Dr Jim Kennedy via Groups.Io <phdad_ccm=yahoo.com@groups.io> wrote:
A truly well written and informative article about CW operating. http://atcweb.com/tsn/Accent.pdf 
Hope you all enjoy.
--
*72/73, Doc - K2PHD
FN20qv - SKCC#5669 - NAQCC#9194 - FISTS#18988*
Friendly reminder about the SSS

John Lonigro
 

Folks:

Don't forget.  The Second Sunday Sprint is tomorrow night, 7:00-9:00 pm CST (8:00-10:00 pm EST, and 5:00-7:00 pm PST).  There is sometimes some confusion when we switch from Daylight Saving Time to Standard Time.  If you prefer UTC, until DST starts again in the spring, the contest is from 0100-0300Z Monday.

As usual, try to get your score posted as soon as possible after the contest ends (qrpcontest.com). I try to tabulate everything Tuesday evening or early Wednesday morning.

72,

John, AA0VE
4SQRP Contest Coordinator
Nouveau on-the-air

w9ran
 

With the instability problem out of the way I've used the Nouveau on the air and can report that it received rave reviews on this morning's Midwest Classic (AM) Radio Net on 3885 kHz.    From my QTH in northwest Illinois the reports were "loud and clear" and S7 to S9 from Detroit and St. Louis (250-300 miles) and "10 over 9" from 60 to 80 miles away.   Several commented favorably on the audio quality.

Now the rest of the story:   When I first checked in I was using a small converted CB amplifier using a single sweep tube that produces a resting carrier of 20 watts and 80 watts PEP on voice peaks.   But I switched the amplifier off before asking for signal reports and all the above were on the barefoot signal, not through the amplifier!

Clearly the amplifier makes a difference but this test just proves that with a clear frequency and good antenna (full size 75 meter dipole at 50' in this case) the barefoot Nouveau 75 can do a fine job.

Here's a picture of the Nouveau 75 on it's D&A "Hawk" CB amplifier perch:  https://i.imgur.com/cuFVzBl.png

I'd converted the amplifier to 80/40 meters some time ago, replacing their inefficient tank circuit (except on 11 meters, for some reason?) with a tapped toroid and upgrading the power supply.  It uses a single 6KG6 and would be an easy project to duplicate using most any sweep tube - the schematic can be found online.

73, Bob W9RAN
Great CW operating article

Dr Jim Kennedy
 

A truly well written and informative article about CW operating. http://atcweb.com/tsn/Accent.pdf 
Hope you all enjoy.
--
*72/73, Doc - K2PHD
FN20qv - SKCC#5669 - NAQCC#9194 - FISTS#18988*
Re: Selling Hilltopper 20 and QCX 40

KF6VCI <kf6vci@...>
 

Dang! I missed that message. (Am still looking for another 40 m QCX 40 / 30 / 20
or 5-Watter (built, please)?

72,
Chris KF6VCI

On Sat, Nov 9, 2019 at 8:32 AM K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:
QCX has sold. Thanks all!

> On Nov 8, 2019, at 12:24 PM, K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:
>
> HT20 is sold!
> 73, Will
> K0WDO
>
>
>> On Nov 8, 2019, at 8:28 AM, K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:
>>
>> Good morning, I have a new still sealed in the box Hilltopper 20 kit. Included is a second package with the audio upgrade parts from Dave as well as a second IC with the updated firmware. Asking 100 shipped.  New baby has left little time to build kits.
>>
>> One kit I did get finished is a new QCX 40, in a W4MHZ case with Anderson powerpoles, onboard case key and a mini-heatsink. Works great, asking 75 shipped.
>>
>> Email me direct if you have questions or would like to see pictures.
>>
>> K0WDO@...
>>
>> Thanks and 73,
>> Will
>> K0WDO
>>
>>
>>
>>
>>
>>
>
>
>
>






--
Kind Regards / Mit freundlichen Gruessen

Chris Wagner
+880 189 303 4250, Skype: hs0zfe, LINE and WhatsApp: +66 98 483 7745
Inside Bangladesh: 880 184 7305 146 (I'm using this number to call back)
Re: nouveau 75 Dave Cripe/Voltage Checks

Charles W. Powell
 

I haven’t checked/noticed any heating with my Nouveau 75.  Would you advise this as a routine mod?

73,

Charles - NK8O

On Nov 7, 2019, at 1:19 PM, nm0s_qrp via Groups.Io <ai9e_qrp@...> wrote:

I will suggest another mod that might be a little easier to pull off, just remove R47.  The key is to reduce the bias on Q12.

Re: Selling Hilltopper 20 and QCX 40

K0WDO Will Osborn
 

QCX has sold. Thanks all!

On Nov 8, 2019, at 12:24 PM, K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:

HT20 is sold!
73, Will
K0WDO


On Nov 8, 2019, at 8:28 AM, K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:

Good morning, I have a new still sealed in the box Hilltopper 20 kit. Included is a second package with the audio upgrade parts from Dave as well as a second IC with the updated firmware. Asking 100 shipped. New baby has left little time to build kits.

One kit I did get finished is a new QCX 40, in a W4MHZ case with Anderson powerpoles, onboard case key and a mini-heatsink. Works great, asking 75 shipped.

Email me direct if you have questions or would like to see pictures.

K0WDO@...

Thanks and 73,
Will
K0WDO
Upcoming Event: 4SQRP Second Sunday Sprint - Sun, 11/10/2019 7:00pm-9:00pm #cal-reminder

main@4SQRP.groups.io Calendar <main@...>
 

Reminder: 4SQRP Second Sunday Sprint

When: Sunday, 10 November 2019, 7:00pm to 9:00pm, (GMT-06:00) America/Chicago

View Event

Organizer: John Lonigro

Description: 4SQRP Second Sunday Sprint. See http://www.4sqrp.com/4sqrpOnTheAir.php for details.
Re: Selling Hilltopper 20 and QCX 40

K0WDO Will Osborn
 

HT20 is sold!
73, Will
K0WDO

On Nov 8, 2019, at 8:28 AM, K0WDO Will Osborn via Groups.Io <K0WDO=yahoo.com@groups.io> wrote:

Good morning, I have a new still sealed in the box Hilltopper 20 kit. Included is a second package with the audio upgrade parts from Dave as well as a second IC with the updated firmware. Asking 100 shipped. New baby has left little time to build kits.

One kit I did get finished is a new QCX 40, in a W4MHZ case with Anderson powerpoles, onboard case key and a mini-heatsink. Works great, asking 75 shipped.

Email me direct if you have questions or would like to see pictures.

K0WDO@...

Thanks and 73,
Will
K0WDO