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Re: Hallicrafters in an old ABC News clip

 

On Fri, May 3, 2024 at 09:54 AM, Dale WB3BEF wrote:

Would be interested if you have a link to where you saw this, or what season/episode numbers was it?

?

The old ABC News clip appears at 12:38 in this Youtube video:

https://youtu.be/zRdhoYqCAQg?si=4oJy76zQ7a5B9fOt
Re: SR2000 /SR400 RX/TX offset fix

 
Edited

Very Cool,

In the Yaesu FT-857 the radio had a feature that allowed the operator to adjust the Carrier Point for either lower or upper sideband in receive or transmit?+/- 300Hz (p.97 of the operations manual).??
This tweak reminds me of that Carrier Point feature. Makes me think one could substitute a 10k pot for the fixed resistor and have one more adjustment to tinker with....;-)

73
dave
wa3gin

On Fri, May 3, 2024 at 12:00?AM W7WRX via <clark=[email protected]> wrote:
Yes!? ?I now have 2 hours of talk time on it. With the dd 103 counter, there is nonoffset and everyone is happy.

C

On May 2, 2024 8:24 PM, "Jeff AC0C via " <keepwalking188=[email protected]> wrote:

Great idea!

73/jeff/ac0c
alpha-charlie-zero-charlie
On 5/2/2024 6:40 PM, W7WRX wrote:
These radios drop approximately 40 cycles on TX.? This is annoying in modern times.

This drop happens in ALL modes.? I isolated the VFO from the radio and found the issue is the VFO itself. It's not a voltage regulation problem.? The 12ba6 is an odd ball vfo tube and why they used a sharp cutoff tube like this I do not know.?

Rather than rebuild and modify the radio, my friend, Jim k7jeb and I decided to offset the TX voltage to the varactor.? This is done with a 1meg resistor and a 10K.??

Place the 1meg from terminal 12 on relay to the ground terminal next to it.?

Next, unhook the wire from pin 8 on relay.? Insert a 10K resistor in series with relays terminal and the wire.?

That's it.? The offset is gone..it will be within a cycle.?

The rit and cal pot all work normally.??

Hope this helps someone.?
Re: Hallicrafters in an old ABC News clip

 
Edited

Probably a S-27 Bruce..

Paul?
N6FEG?


On Fri, May 3, 2024, 6:44 AM Bruce KX4AZ via <bruce=[email protected]> wrote:
I noticed a Hallicrafters rig in an old ABC News clip that appeared in a recent Last Week Tonight episode covering the history of UFOs, back to the WW2 era. I am curious if anyone has a guess on the model in this very low resolution snapshot..
Re: Hallicrafters in an old ABC News clip

 
Edited

¿ªÔÆÌåÓý

That¡¯ll most likely be an S-27 (or maybe an S-36, later version of the 27).? Would be interested if you have a link to where you saw this, or what season/episode numbers was it?

?

Dale WB3BEF

?

From: [email protected] <[email protected]> On Behalf Of Bruce KX4AZ
Sent: Friday, May 3, 2024 9:44 AM
To: [email protected]
Subject: [HallicraftersRadios] Hallicrafters in an old ABC News clip

?

I noticed a Hallicrafters rig in an old ABC News clip that appeared in a recent Last Week Tonight episode covering the history of UFOs, back to the WW2 era. I am curious if anyone has a guess on the model in this very low resolution snapshot..
Hallicrafters in an old ABC News clip

 
Edited

I noticed a Hallicrafters rig in an old ABC News clip that appeared in a recent Last Week Tonight episode covering the history of UFOs, back to the WW2 era. I am curious if anyone has a guess on the model in this very low resolution snapshot..
Re: SR2000 /SR400 RX/TX offset fix

 
Edited

¿ªÔÆÌåÓý

Yes!? ?I now have 2 hours of talk time on it. With the dd 103 counter, there is nonoffset and everyone is happy.

C

On May 2, 2024 8:24 PM, "Jeff AC0C via groups.io" <keepwalking188@...> wrote:

Great idea!

73/jeff/ac0c
alpha-charlie-zero-charlie
On 5/2/2024 6:40 PM, W7WRX wrote:

These radios drop approximately 40 cycles on TX.? This is annoying in modern times.

This drop happens in ALL modes.? I isolated the VFO from the radio and found the issue is the VFO itself. It's not a voltage regulation problem.? The 12ba6 is an odd ball vfo tube and why they used a sharp cutoff tube like this I do not know.?

Rather than rebuild and modify the radio, my friend, Jim k7jeb and I decided to offset the TX voltage to the varactor.? This is done with a 1meg resistor and a 10K.??

Place the 1meg from terminal 12 on relay to the ground terminal next to it.?

Next, unhook the wire from pin 8 on relay.? Insert a 10K resistor in series with relays terminal and the wire.?

That's it.? The offset is gone..it will be within a cycle.?

The rit and cal pot all work normally.??

Hope this helps someone.?
Re: SR2000 /SR400 RX/TX offset fix

 
Edited

¿ªÔÆÌåÓý

Great idea!

73/jeff/ac0c
alpha-charlie-zero-charlie
On 5/2/2024 6:40 PM, W7WRX wrote:

These radios drop approximately 40 cycles on TX.? This is annoying in modern times.

This drop happens in ALL modes.? I isolated the VFO from the radio and found the issue is the VFO itself. It's not a voltage regulation problem.? The 12ba6 is an odd ball vfo tube and why they used a sharp cutoff tube like this I do not know.?

Rather than rebuild and modify the radio, my friend, Jim k7jeb and I decided to offset the TX voltage to the varactor.? This is done with a 1meg resistor and a 10K.??

Place the 1meg from terminal 12 on relay to the ground terminal next to it.?

Next, unhook the wire from pin 8 on relay.? Insert a 10K resistor in series with relays terminal and the wire.?

That's it.? The offset is gone..it will be within a cycle.?

The rit and cal pot all work normally.??

Hope this helps someone.?
Re: Sprague capacitors variants

 

¿ªÔÆÌåÓý

Don,

?

Maybe it can help your searches or maybe not: there is a site where you can see all Allied Electronics Catalogues from 1929 up to 2015.

Sprague and many other capacitors manufacturers listed within.

Just go to :

?

73, Jacques, VE2JFE in Montreal

?

Yet thanks Jim, it worked ! ,then¡­

I went down the Sprague group looking for the 109p ?[ads from about 1955 to 1959] and I could not see ¡°109p¡±. ?those 109p¡¯s had HCX? and there seemed to be nothing matching.

What is also confusing is that some metalized ?caps were called Black Beauty , but I have never found a metalized called ?¡°Black Beauty¡± ?in ads.

don??? va3drl

Re: 5T restoration - IF cans and R4 toasting

 
Edited

Calling this one complete.? I just need to add terminal posts/strip on the rear for the three antenna leads, not sure how they where originally terminated.? Only pictures I've seen show the three wires coming thru the grommet on rear of chassis and hanging there.? If anyone has a pic or details on on the antenna leads where dressed I could use the input.
Thank you.


--
Dan
K1DTS

VID_20240502_201057126.mp4
VID_20240502_201057126.mp4

Re: Sprague capacitors variants

 

¿ªÔÆÌåÓý

Yet thanks Jim, it worked ! ,then¡­

I went down the Sprague group looking for the 109p ?[ads from about 1955 to 1959] and I could not see ¡°109p¡±. ?those 109p¡¯s had HCX? and there seemed to be nothing matching.

What is also confusing is that some metalized ?caps were called Black Beauty , but I have never found a metalized called ?¡°Black Beauty¡± ?in ads.

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Thursday, May 2, 2024 4:13 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Sprague capacitors variants

?

Don

Did you try the URL I sent a few hours ago?

Jim

?

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy

?

?

On Thursday, May 2, 2024 at 02:06:56 PM CDT, don Root <drootofallevil@...> wrote:

?

?

Ditto here

?

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow
Sent: Thursday, May 2, 2024 2:00 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Sprague capacitors variants

?

Can't get this to load. Tried both Firefox and Edge

_,_._,_


--
don??? va3drl ?


--
don??? va3drl
SR2000 /SR400 RX/TX offset fix

 
Edited

These radios drop approximately 40 cycles on TX.? This is annoying in modern times.

This drop happens in ALL modes.? I isolated the VFO from the radio and found the issue is the VFO itself. It's not a voltage regulation problem.? The 12ba6 is an odd ball vfo tube and why they used a sharp cutoff tube like this I do not know.?

Rather than rebuild and modify the radio, my friend, Jim k7jeb and I decided to offset the TX voltage to the varactor.? This is done with a 1meg resistor and a 10K.??

Place the 1meg from terminal 12 on relay to the ground terminal next to it.?

Next, unhook the wire from pin 8 on relay.? Insert a 10K resistor in series with relays terminal and the wire.?

That's it.? The offset is gone..it will be within a cycle.?

The rit and cal pot all work normally.??

Hope this helps someone.?
Re: Sprague capacitors variants

 

Don
Did you try the URL I sent a few hours ago?
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Thursday, May 2, 2024 at 02:06:56 PM CDT, don Root <drootofallevil@...> wrote:


Ditto here

?

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow
Sent: Thursday, May 2, 2024 2:00 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Sprague capacitors variants

?

Can't get this to load. Tried both Firefox and Edge

_,_._,_


--
don??? va3drl

Re: Sprague capacitors variants

 

¿ªÔÆÌåÓý

Ditto here

?

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow
Sent: Thursday, May 2, 2024 2:00 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Sprague capacitors variants

?

Can't get this to load. Tried both Firefox and Edge

_,_._,_


--
don??? va3drl
Re: Sprague capacitors variants

 

Latest update to the "Vintage Tubular Capacitor" article can be found here:

An overview of what Mr. Acorn has published can be found here:
He appears to be young for a tube guy so there is hope.....
Regards,
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Thursday, May 2, 2024 at 02:49:57 AM CDT, Richard Knoppow <1oldlens1@...> wrote:


Got it, thank you. Boy, Sprague made a lot of capacitors.


On 5/1/2024 11:11 PM, Jim Whartenby via groups.io wrote:
Copy the URL then go to the wayback machine and enter the copied
address.? Click on the most current save then open the address.
Jim
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Sprague capacitors variants

 

Got it, thank you. Boy, Sprague made a lot of capacitors.


On 5/1/2024 11:11 PM, Jim Whartenby via groups.io wrote:
Copy the URL then go to the wayback machine and enter the copied
address.? Click on the most current save then open the address.
Jim
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: Sprague capacitors variants

 

Copy the URL then go to the wayback machine and enter the copied address.? Click on the most current save then open the address.
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Thursday, May 2, 2024 at 01:00:10 AM CDT, Richard Knoppow <1oldlens1@...> wrote:


Can't get this to load. Tried both Firefox and Edge


On 5/1/2024 7:57 PM, wekemp@... wrote:
There is a most interesting online document written by a Jesse Acorn
about ¡°Vintage Tubular Capacitors: Paper or Polymer?¡± at

<>.

Included is a table of 200 capacitor types by manufacturer with the
physical/dielectric parameters. He lists eight types of Sprague Black
Beauty capacitors. Also of note is any capacitors he had identified as
containing PCB oils are highlighted in Red letters (none of which were
Sprague).

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

Re: Sprague capacitors variants

 

Can't get this to load. Tried both Firefox and Edge


On 5/1/2024 7:57 PM, wekemp@... wrote:
There is a most interesting online document written by a Jesse Acorn
about ¡°Vintage Tubular Capacitors: Paper or Polymer?¡± at

<>.

Included is a table of 200 capacitor types by manufacturer with the
physical/dielectric parameters. He lists eight types of Sprague Black
Beauty capacitors. Also of note is any capacitors he had identified as
containing PCB oils are highlighted in Red letters (none of which were
Sprague).

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: Sprague capacitors variants

 

Very nice, thank you!
Regards,
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Wednesday, May 1, 2024 at 09:57:44 PM CDT, wekemp@... <wekemp@...> wrote:


There is a most interesting online document written by a Jesse Acorn about ¡°Vintage Tubular Capacitors: Paper or Polymer?¡± at .

Included is a table of 200 capacitor types by manufacturer with the physical/dielectric parameters. He lists eight types of Sprague Black Beauty capacitors. Also of note is any capacitors he had identified as containing PCB oils are highlighted in Red letters (none of which were Sprague).
Re: Sprague capacitors variants

 

There is a most interesting online document written by a Jesse Acorn about ¡°Vintage Tubular Capacitors: Paper or Polymer?¡± at .

Included is a table of 200 capacitor types by manufacturer with the physical/dielectric parameters. He lists eight types of Sprague Black Beauty capacitors. Also of note is any capacitors he had identified as containing PCB oils are highlighted in Red letters (none of which were Sprague).
Re: Sprague capacitors variants

 
Edited

¿ªÔÆÌåÓý

Re signatures

A long time back this is how I managed to get an auto signature. That signature box was not obvious to me when it was empty, so maybe others have the same problem¡­ image here:

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE
Sent: Wednesday, May 1, 2024 11:16 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] Sprague capacitors variants

?

Hi ¡±?Wekemp¡± (it can be good that you sign your postings, btw¡­)

?


--
don??? va3drl
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