Date   

Test

WA0ITP
 

test sri to clutter your inbox
-- 
72 WAØITP
I love this radio stuff.
Back to the bench, Winter is too valuable to waste.
www.wa0itp.com
www.4sqrp.com


Re: Bayou Jumper?

Jim, N5IB
 

The two output pins of the NJM2113 audio amp chip (U1) are each biased at about 6 volts DC. That's why they can't be allowed to be grounded - it shorts out the bias voltage and zaps the output stage.

So you are correct - if you are using polarized capacitor(s) for DC blocking, the positive lead(s) should be connected towards the chip's pin(s)

You might get away with just one capacitor - in series with the ring terminal. That's the terminal that's likely to get grounded if using a powered speaker, or a speaker with a mono plug that has a ground path. But you have to be sure that the tip terminal of your external device doesn't have a DC path to ground somehow. Many powered speakers or audio filters already have a blocking capacitor in series with their input. Check their schematic or physically inspect the device if possible. If you're not sure, put caps in both leads.

Value depends on what is to be connected. Many powered speakers or audio filters have a fairly high input impedance, so a smaller capacitor is sufficient.
For example - suppose the input impedance is 100K. At 300 Hz, even as small as a 0.1 uF cap has a reactance of only about 5K. So it would not introduce very much voltage drop. But if the input impedance were like that of a normal speaker or headphone (a few tens of ohms), very little signal would get through.

This is why putting the capacitor in the external cable can be a convenience. You won't interfere with the normal use of your headphones, and only a smaller value capacitor(s) will probably be needed.

If the capacitor(s) get installed between the PC board and the headphone jack, and if you still intend to use headphones on occasion, the the capacitor(s) will need to be much larger - probably at least 10 uF, but need not be larger than 50 uF or so.

N5IB


Re: BJ build - TX Xtal doesn't swing

ussv dharma
 

What is a tx that wont swing?


If you don't change direction you WILL arrive exactly where you're headed!!
 
MSGT. Susan Meckley, USA (Ret.)
W7KFI-5  & AFZ4SM
 

--------------------------------------------

On Tue, 5/1/18, Jess Gypin <ontarget1911@gmail.com> wrote:

Subject: Re: [4SQRP] BJ build - TX Xtal doesn't swing
To: main@4SQRP.groups.io
Date: Tuesday, May 1, 2018, 9:54 AM

It has been brought up in the
group in the last week or so.

> On May 1, 2018, at 7:41 AM, Raimund Reh
<raimund.reh@web.de>
wrote:
>
> Hi Dave
-no it's not your brain...
> and I
did it my way... not like Franky but take a look at the
fotos I add...
> I also think we are not
alone with this expereance of none oscillating Q4 and we
wonder why none is asking...
> ... cheers
to you all guys - Ray
>
>
>
> <IMG_20180501_WA0001.jpg>
> <IMG_20180501_WA0009.jpg>


Re: BJ build - TX Xtal doesn't swing

Duane Brayton
 

You are definitely not alone on no crystal osc. I found after many hours of work, that the bias of the oscillator of
is very important.  It needs to be at least 3.00 volts. Check my report in the database. 
Good luck & 72
Duane Brayton KE0IUV

Sent from TypeApp

On May 1, 2018, at 6:53 PM, Jeff Fein <jeffrey_travers@...> wrote:
I am sure some of us like me just assumed we blew it and replaced it on our own.  They are not expensive and in my case I could get them much faster locally.
Cheers Jeff
Vk3GMO

-----Original Message-----
From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Raimund Reh
Sent: Tuesday, May 1, 2018 11:42 PM
To: main@4SQRP.groups.io
Subject: Re: [4SQRP] BJ build - TX Xtal doesn't swing

Hi Dave -no it's not your brain...
and I did it my way... not like Franky but take a look at the fotos I add...
I also think we are not alone with this expereance of none oscillating Q4 and we wonder why none is asking...
... cheers to you all guys - Ray








Re: Bayou Jumper?

Bob Parr
 

Darn. no 'c'. Well still like the way you guys think! The manual said at least 1 uf. would 10 be better? Also it says if using electrolytic with polarity, Positive side to the tip and or ring of the headphone jack. Assuming I put these caps in the board as opposed to making a cable, I would put the positive side to the board and negative to the tip and ring of the jack?

Bob
KG5GTE

JP2 and JP3 are only on the rev A(c) boards.
You can find that "revA(c)" designation on the silk screened
legend just above the L5 and L6 on the top side of the main board.
The earlier green panel main boards are just "revA"

N5IB


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Re: Bayou Jumper?

Jim, N5IB
 

JP2 and JP3 are only on the rev A(c) boards.
You can find that "revA(c)" designation on the silk screened legend just above the L5 and L6 on the top side of the main board.
The earlier green panel main boards are just "revA"

N5IB


Wednesday Evening 40 and 80 meter Nets - Wed, 5/2/18 8:00pm-9:00pm #cal-reminder

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

Reminder:
Wednesday Evening 40 and 80 meter Nets

When:
Wednesday, 2 May 2018
8:00pm to 9:00pm
(GMT-05:00) America/Chicago

Where:
40 and 80 Meters

Description:
The 40 Meter Net will be at 8:00 pm central or 0100 UTC on 7.122 +-.
NCS will be Bill KV6Z.

Wednesday evening 80 Meter CW Net. will be at 0130 UTC Thursday (8:30PM Central Time Wednesday). 
The net will be called on 3.564 MHz +/- QRM.



Net control operators are Johnny AC0BQ or Paul N0NBD.

View Event.


Re: Bayou Jumper?

Bob Parr
 

Where are JP 2 and 3? I only see JP1 on the manual. I know mine is a rev A but I am not sure if it is an A(c).

Bob

The Soup'er does NOT provide any DC isolation on the speaker lines.
So you still need to make sure that neither audio output lead has a
DC path to ground, as you saw in the Appendix of the manual.

If you have one of the newest, rev A(c), circuit boards, there
are some extra pads provided (JP2 and JP3) where the appropriate
blocking capacitor(s) can be mounted. Then you cut the exposed
trace(s) between the pad(s) on the bottom side of the board to put
the cap(s) into the circuit.

A powered speaker with a self-contained battery supply can be used
without needing a DC block. But if either of the external speaker
connections has a DC path to the same ground as the BJ (like back
through a wall wart power supply) it would short out and damage
the audio chip.

N5IB


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Re: BJ build - TX Xtal doesn't swing

Jeff Fein
 

I am sure some of us like me just assumed we blew it and replaced it on our own. They are not expensive and in my case I could get them much faster locally.
Cheers Jeff
Vk3GMO

-----Original Message-----
From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Raimund Reh
Sent: Tuesday, May 1, 2018 11:42 PM
To: main@4SQRP.groups.io
Subject: Re: [4SQRP] BJ build - TX Xtal doesn't swing

Hi Dave -no it's not your brain...
and I did it my way... not like Franky but take a look at the fotos I add...
I also think we are not alone with this expereance of none oscillating Q4 and we wonder why none is asking...
... cheers to you all guys - Ray


Re: Wednesday Evening 40 and 80 meter Nets - Wed, 5/2/18 8:00pm-9:00pm #cal-reminder

ussv dharma
 

I will be there...boob tube be dammed


If you don't change direction you WILL arrive exactly where you're headed!!
 
MSGT. Susan Meckley, USA (Ret.)
W7KFI-5  & AFZ4SM
 

--------------------------------------------

On Tue, 5/1/18, Michael McEwen <michael.t.mcewen@gmail.com> wrote:

Subject: Re: [4SQRP] Wednesday Evening 40 and 80 meter Nets - Wed, 5/2/18 8:00pm-9:00pm #cal-reminder
To: main@4sqrp.groups.io
Date: Tuesday, May 1, 2018, 1:36 PM

I'm trying guys...
can't get my antenna up  due to physical issues. Have
40 EF wire... what is the best height for an inverted V
?On Mon, Apr
30, 2018, 8:00 PM main@4SQRP.groups.io
Calendar <main@4sqrp.groups.io>
wrote:Reminder:
Wednesday Evening 40 and 80 meter Nets

When:

Wednesday, 2 May 2018
8:00pm to 9:00pm

(GMT-05:00) America/Chicago




Where:
40 and 80 Meters



Description:
The 40 Meter Net will be at 8:00 pm central or 0100 UTC on
7.122 +-.NCS will be Bill KV6Z.Wednesday
evening 80 Meter CW Net. will be at 0130 UTC Thursday
(8:30PM Central Time Wednesday).  The net will be
called on 3.564 MHz +/- QRM. Net control
operators are Johnny AC0BQ or Paul N0NBD.



View
Event.


Re: Wednesday Evening 40 and 80 meter Nets - Wed, 5/2/18 8:00pm-9:00pm #cal-reminder

Mlike McEwen
 

I'm trying guys... can't get my antenna up  due to physical issues. Have 40 EF wire... what is the best height for an inverted V ?


On Mon, Apr 30, 2018, 8:00 PM main@4SQRP.groups.io Calendar <main@4sqrp.groups.io> wrote:

Reminder:
Wednesday Evening 40 and 80 meter Nets

When:
Wednesday, 2 May 2018
8:00pm to 9:00pm
(GMT-05:00) America/Chicago

Where:
40 and 80 Meters

Description:
The 40 Meter Net will be at 8:00 pm central or 0100 UTC on 7.122 +-.
NCS will be Bill KV6Z.

Wednesday evening 80 Meter CW Net. will be at 0130 UTC Thursday (8:30PM Central Time Wednesday). 
The net will be called on 3.564 MHz +/- QRM.



Net control operators are Johnny AC0BQ or Paul N0NBD.

View Event.


Re: BJ build - TX Xtal doesn't swing

Jess Gypin
 

It has been brought up in the group in the last week or so.

On May 1, 2018, at 7:41 AM, Raimund Reh <raimund.reh@web.de> wrote:

Hi Dave -no it's not your brain...
and I did it my way... not like Franky but take a look at the fotos I add...
I also think we are not alone with this expereance of none oscillating Q4 and we wonder why none is asking...
... cheers to you all guys - Ray



<IMG_20180501_WA0001.jpg>
<IMG_20180501_WA0009.jpg>


Re: BJ build - TX Xtal doesn't swing

Jess None
 

Send an email to the person that kitted the BJ. They will send you a replacement. Email address is on the website.

On May 1, 2018, at 12:14 AM, Raimund Reh <raimund.reh@web.de> wrote:

" #16937
..
I'm pretty sure that IRF-510 transistors that are marked ""Y64K AP" work reasonably well at Q4, but those marked "618 P 77 WS" would kill the oscillator."

So my IRF-510 is(!) marked "618 P 77 WS" - I cut him out and Q4 oscillates. Wow!
Unfortunately I haven't an subst. IRF-510 e.g. Mouser #844-IRF510PBF factory marked "N77K BJ") on hand.
so how?

Thank you all for kind assistance
cheers - Ray



Re: BJ build - TX Xtal doesn't swing

Raimund Reh
 

Hi Dave -no it's not your brain...
and I did it my way... not like Franky but take a look at the fotos I add...
I also think we are not alone with this expereance of none oscillating Q4 and we wonder why none is asking...
... cheers to you all guys - Ray


Re: BJ build - TX Xtal doesn't swing

David Wilcox
 

Guys,

This is just another instance of the wrong part (either in the kit or from your junque box).  I know it takes longer but with the low cost of those Chinese part testers I am now testing each part before installing.  Also it slows me down enough to rethink each part (why and what for) as I install it.

It is surprising how reading the same instructions over and over again, and on different days, how much the meaning changes.  Maybe is is just my old brain but going slow makes for a better build.

Dave K8WPE

On Apr 30, 2018, at 3:58 PM, Richard Dickerson <richard.dickerson@...> wrote:

Check tank capacitor. I had wrong value and mine wouldn't oscillate 


Re: BJ build - TX Xtal doesn't swing

Raimund Reh
 

" #16937
..
I'm pretty sure that IRF-510 transistors that are marked ""Y64K AP" work reasonably well at Q4, but those marked "618 P 77 WS" would kill the oscillator."

So my IRF-510 is(!) marked "618 P 77 WS" - I cut him out and Q4 oscillates. Wow!
Unfortunately I haven't an subst. IRF-510 e.g. Mouser #844-IRF510PBF factory marked "N77K BJ") on hand.
so how?

Thank you all for kind assistance
cheers - Ray


Re: Bayou Jumper?

Jim, N5IB
 

That'll be the 22 pF cap for use at C31 if needed.
The "220" means 22 x (10 to the power zero) = 22 x 1 = 22 pF

Much to small a capacitance to use for the DC block at the audio output. That will have to be a few micro farads, at least.

N5IB


Re: Bayou Jumper?

Bob Parr
 

Yes the back side was 220 A1K.

Can these be used for the DC blocking?

Bob
KG5GTE

The cap marked "10" is most likely the 10 pF cap included in the
Bayou Jumper kit in case you needed to use it at C20a to lower the
receive tuning range.

There would have also been a 22 pF cap to be used if needed at C31.

The "719" doesn't seem like a standard capacitor marking. Anything
on the other side of it?

N5IB


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Wednesday Evening 40 and 80 meter Nets - Wed, 5/2/18 8:00pm-9:00pm #cal-reminder

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

Reminder:
Wednesday Evening 40 and 80 meter Nets

When:
Wednesday, 2 May 2018
8:00pm to 9:00pm
(GMT-05:00) America/Chicago

Where:
40 and 80 Meters

Description:
The 40 Meter Net will be at 8:00 pm central or 0100 UTC on 7.122 +-.
NCS will be Bill KV6Z.

Wednesday evening 80 Meter CW Net. will be at 0130 UTC Thursday (8:30PM Central Time Wednesday). 
The net will be called on 3.564 MHz +/- QRM.



Net control operators are Johnny AC0BQ or Paul N0NBD.

View Event.


Re: Bayou Jumper?

Jim, N5IB
 

The cap marked "10" is most likely the 10 pF cap included in the Bayou Jumper kit in case you needed to use it at C20a to lower the receive tuning range.

There would have also been a 22 pF cap to be used if needed at C31.

The "719" doesn't seem like a standard capacitor marking. Anything on the other side of it?

N5IB

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