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Re: CW Sidetone ideas

 

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Floyd,

When you get all the kinks out of?the side-tone mod, post a schematic of your project.


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of Floyd - K8AC via groups.io <floydsense@...>
Sent: Monday, December 9, 2024 6:49 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] CW Sidetone ideas
?
On Fri, Dec 6, 2024 at 03:33 PM, Don VE3IDS wrote:
It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?
I've just started to work on a CW sidetone technique for the HT-44.? Great idea of Walt's to use a diode and pin 8 of the octal plug to accomplish the keying.? I built a little LM555 based sidetone oscillator based on the design at AA8V's website.? I found that I could connect the output to the 500 Ohm terminal on the rear of the SX-117 and that enables you to hear the sidetone in the headphones or the speaker.? Haven't worked out any volume differences yet.
?
73, Floyd - K8AC
Re: CW Sidetone ideas

 

On Fri, Dec 6, 2024 at 03:33 PM, Don VE3IDS wrote:
It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?
I've just started to work on a CW sidetone technique for the HT-44.? Great idea of Walt's to use a diode and pin 8 of the octal plug to accomplish the keying.? I built a little LM555 based sidetone oscillator based on the design at AA8V's website.? I found that I could connect the output to the 500 Ohm terminal on the rear of the SX-117 and that enables you to hear the sidetone in the headphones or the speaker.? Haven't worked out any volume differences yet.
?
73, Floyd - K8AC
Re: HT-44 Common Problem?

 

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Floyd,

I have seen that a couple of times over the years. It boils down to the balance of all triodes in V3 and V4.? The triodes in each tube need to be matched and V3 and V4 need to be matched. If either of the tubes suffers an intermittent short, large loss of gain or becomes gassy you can lose R16 and 17.?

(You probably already know this, but I thump the tubes in the tube tester while doing the shorts test to check for intermittent shorts.)

If you find it difficult to balance the system, look for drifted resistors or leaky capacitors. The respective components in the V3 circuit need to be very close to equal to those in the V4 circuit.

?


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of Floyd - K8AC via groups.io <floydsense@...>
Sent: Monday, December 9, 2024 9:32 AM
To: [email protected] <[email protected]>
Subject: [HallicraftersRadios] HT-44 Common Problem?
?
This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
Re: HT-44 Common Problem?

 
Edited

I had to replace those resistors in a HT44 also. I recall measuring the current and it was exceeding the dissipation of the 2 watt resistors.

Unable to get my hands on 5 watt resistors, I put 10 watt 25k resistors in there.






On Mon, Dec 9, 2024, 9:32 AM Floyd - K8AC via <floydsense=[email protected]> wrote:
This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
HT-44 Common Problem?

 

This is the second HT-44 where I've run into this problem.? I use the HT-44 heavily on CW and my current one has logged hundreds of QSOs in contests.? The other day it suddenly had no output on any band, same symptom observed on another HT-44 I owned.? In digging into the problem, I found the cause to be the same as on the other HT-44.? Resistors R16 and R17 (22K , 2 watt) were cooked and V3, a 12BH7 associated with those resistors tested weak.? I replaced the resistors and the 12BH7 and now all is well again.? Had to adjust the pots to null the carrier for SSB.? I wonder if others have experienced that problem?? Not sure if the cause of the failure was the tube, or maybe the two resistors are undersized for the current?
?
73, Floyd - K8AC
Re: CW Sidetone ideas

 
Edited

I used one of these in a SR 150


It was powerful enough to just parallel across the speaker lines and drive the speaker directly.?

73 Don ve3ids?

On Fri., Dec. 6, 2024, 1:53 p.m. Steve Marquie via , <=[email protected]> wrote:

?

Great suggestions. I have a external sidetone oscillator, and will give the “Pin #8” option a try. Once, I used a TO Keyer that I’d modified to accept a straight key input as an sidetone. Unfortunately, I don’t have that any longer.

?

73

Steve

?

?

?

ClimaTEQ, LLC

?

Steve Marquie, President

W8tow.sm@...

517-927-9322

YouTUBE

?

ClimaTEQ, LLC is a Campbell Scientific Partner

Project Management Institute PMI

Member AASC

?

From: [email protected] <[email protected]> On Behalf Of John K5MO via
Sent: Friday, December 6, 2024 1:09 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] CW Sidetone ideas

?

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.

?

?

Found on Ebay

?

John K5MO

?

On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=[email protected]> wrote:

Good day all

I enjoy using various vintage "separates" on CW, with a bug.

The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.

But, Collins and Drake have a sidetone.?

Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?

73

W8tow

?


Virus-free.
Re: CW Sidetone ideas

 
Edited

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?

Great suggestions. I have a external sidetone oscillator, and will give the “Pin #8” option a try. Once, I used a TO Keyer that I’d modified to accept a straight key input as an sidetone. Unfortunately, I don’t have that any longer.

?

73

Steve

?

?

?

ClimaTEQ, LLC

4565 Hawthorne Lane

Okemos, MI 48864

?

Steve Marquie, President

W8tow.sm@...

517-927-9322

YouTUBE

?

ClimaTEQ, LLC is a Campbell Scientific Partner

Project Management Institute PMI

Member AASC

?

From: [email protected] <[email protected]> On Behalf Of John K5MO via groups.io
Sent: Friday, December 6, 2024 1:09 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] CW Sidetone ideas

?

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.

?

?

Found on Ebay

?

John K5MO

?

On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=[email protected]> wrote:

Good day all

I enjoy using various vintage "separates" on CW, with a bug.

The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.

But, Collins and Drake have a sidetone.?

Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?

73

W8tow

?


Virus-free.
Re: CW Sidetone ideas

 
Edited

I use the several Curtis keyers that are boatanchor proof, and can be set for paddles or manual keying.




Found on Ebay

John K5MO



On Fri, Dec 6, 2024 at 11:57?AM Steve Marquie via <=[email protected]> wrote:
Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?
Re: CW Sidetone ideas

 
Edited

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The simplest way is to connect an external tone oscillator to pin 8 of J3 Through a diode.



Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of Steve Marquie via groups.io <w8tow.sm@...>
Sent: Friday, December 6, 2024 11:57 AM
To: [email protected] <[email protected]>
Subject: [HallicraftersRadios] CW Sidetone ideas
?
Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?
CW Sidetone ideas

 

Good day all
I enjoy using various vintage "separates" on CW, with a bug.
The common issue is what to do for sidetone when using a straight key or bug. Typically,? not music the Rx, and have a fast hand on the RF gain control works well.
But, Collins and Drake have a sidetone.?
Has anyone added a sidetone to HT44/ SX117 or HT32B/SX101 SX115 combos?
73
W8tow
?
Re: SX-140 with 6M Preamp Installed?

 

?
Common practice back in the "good of days" when we were a lot more creative. Maybe original owner didn't want the preamp "box" hanging off the back end of the receiver and he had room inside the receiver to mount it. Over the years, I've installed homebrew preamps in receivers and VHF/UHF transceivers. Sometimes when I was selling the rig at a hamfest, I even remembered to add a schematic for the addition inside the manual.
Pete, wa2cwa
?
?
On Thu, 05 Dec 2024 13:46:07 -0800 "John Limbach, K8NN" <john@...> writes:

Anyone seen one like this?? I bought this off eBay years ago and it's been sitting in a box until yesterday.? Took it out for a look and was surprised to find that I had two more tubes than shown in the manual or schematic.? And a large box mounted as shown in the picture with a 6AG5 tube on it's top and a cable running from the box to underneath the chassis.? There was also an extra IF looking transformer and an additional 6BA6 mounted between the new trans can and the existing one.
?
I can barely make out, scratched into the top of the box, 6M Preamp and some voltages, I'm guessing are what the cable has to pick off from under the chassis.
?
Tested the tubes and brought it up on the variac and Dim Bulb.? Dial lamps light up but no audio (or smoke).? Haven't started troubleshooting yet as I got sidetracked with the
extra tubes and transformer, not to mention "The Box".? ?Any insight on this?
?
Thanks,
?
K8NN
?
SX-140 with 6M Preamp Installed?

 
Edited

Anyone seen one like this?? I bought this off eBay years ago and it's been sitting in a box until yesterday.? Took it out for a look and was surprised to find that I had two more tubes than shown in the manual or schematic.? And a large box mounted as shown in the picture with a 6AG5 tube on it's top and a cable running from the box to underneath the chassis.? There was also an extra IF looking transformer and an additional 6BA6 mounted between the new trans can and the existing one.
?
I can barely make out, scratched into the top of the box, 6M Preamp and some voltages, I'm guessing are what the cable has to pick off from under the chassis.
?
Tested the tubes and brought it up on the variac and Dim Bulb.? Dial lamps light up but no audio (or smoke).? Haven't started troubleshooting yet as I got sidetracked with the
extra tubes and transformer, not to mention "The Box".? ?Any insight on this?
?
Thanks,
?
K8NN
?
Re: Taming a VFO - HT46

 

Walt and Jacques - Thanks for your kind offers. It is nice to know I have options. For now the series capacitor combo that I have been tweaking is adequate. Drift is much better than before. So I am going to move on the the pulling or chirp problem. If I can get that solved I may come back and ask you guys for a capacitor.?
?
For a transmitter that is so clean and pretty this little bugger sure has some challenging problems inside. 73 - Jerry
Re: Taming a VFO - HT46

 
Edited

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Jerry,

?

I found a 82pF, N080 capacitor in my parts “inventory”, it seems to be NOS, but it test at 92pF.

See attached.

If ever you may need it, just send me your mail address, in case that Canada Post strike ends soon enough…

?

73, Jacques, VE2JFE in Montreal

?

It looks like the problem was one of those big offenders you mentioned Walt. Specifically C85 82pfN80. It measures 82pf but seems to have lost it's temperature compensation characteristics. Now the challenge is finding a replacement.??

Surplus Sales of Nebraska seems to be the only supplier of tubular capacitors but they don't have much in that range. I considered trying a Class 1 disk ceramic but most of those are NP0 or N750. My junk box produced a 62pfN150 and I have been playing with a series and parallel NP0 to get in the ball park. That is pretty crude, not a permanent solution and I'm still not where I need to be with the drift problem. Back to googling "dogbone" "tubular ceramic" "temperature compensating capacitor" etc.?
Re: Taming a VFO - HT46

 
Edited

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I have found that 82pf N80 difficult to find also. I have successfully used an 82pf N30 as a replacement.
I have a couple left. If you have no luck finding?an N80 shoot me an email at cateswa at msn dot com.




Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of W0PWE via groups.io <j.b.hall@...>
Sent: Wednesday, December 4, 2024 9:09 AM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] Taming a VFO - HT46
?
It looks like the problem was one of those big offenders you mentioned Walt. Specifically C85 82pfN80. It measures 82pf but seems to have lost it's temperature compensation characteristics. Now the challenge is finding a replacement.?
?
Surplus Sales of Nebraska seems to be the only supplier of tubular capacitors but they don't have much in that range. I considered trying a Class 1 disk ceramic but most of those are NP0 or N750. My junk box produced a 62pfN150 and I have been playing with a series and parallel NP0 to get in the ball park. That is pretty crude, not a permanent solution and I'm still not where I need to be with the drift problem. Back to googling "dogbone" "tubular ceramic" "temperature compensating capacitor" etc.?
Re: Taming a VFO - HT46

 

It looks like the problem was one of those big offenders you mentioned Walt. Specifically C85 82pfN80. It measures 82pf but seems to have lost it's temperature compensation characteristics. Now the challenge is finding a replacement.?
?
Surplus Sales of Nebraska seems to be the only supplier of tubular capacitors but they don't have much in that range. I considered trying a Class 1 disk ceramic but most of those are NP0 or N750. My junk box produced a 62pfN150 and I have been playing with a series and parallel NP0 to get in the ball park. That is pretty crude, not a permanent solution and I'm still not where I need to be with the drift problem. Back to googling "dogbone" "tubular ceramic" "temperature compensating capacitor" etc.?
Re: Non-Hallicrafters question (audio amp)

 

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we are in the wrong group but?
i own an A300 that uses 7408/6v6 output. simple amp w/a great sound w/only 12 watts out.
???????????? barry

From: [email protected] <[email protected]> on behalf of Richard Knoppow via groups.io <1oldlens1@...>
Sent: Sunday, December 1, 2024 5:08 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] Non-Hallicrafters question (audio amp)
?
That's the one





-------- Original message --------
From: don Root <drootofallevil@...>
Date: 12/1/24 1:48 PM (GMT-08:00)
Subject: Re: [HallicraftersRadios] Non-Hallicrafters question (audio amp)

Citation 2--- That’s a monster with a ton of iron! ..now that I see one

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jacques_VE2JFE via groups.io
Sent: Sunday, December 1, 2024 3:52 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Non-Hallicrafters question (audio amp)

?

Hi Richard,

A Citation II !

This is a special amplifier: video pentodes used as input + drivers, with multiple feedback loops.

I have one that waits to be “restored”.

See attached.

?

73, Jacques, VE2JFE in Montreal


--
don??? va3drl

Re: Taming a VFO - HT46

 

Thanks you Walt. I appreciate all your help. I will try to implement your suggestions tomorrow.?
Re: Identify transformer

 

Well, that's the reactance of an inductor. Someone measured the
inductance with a bridge. That measurement may or may not change with
the level of the drive from the bridge. In any case what I meant was the
expected inductance for a transformer for different applications. It
will also vary with the frequency the transformer is used at. For
instance the inductance of an audio transformer determines its low
frequency response. What I would have to look up is the inductance
required for a power transformer. The formulas are not hard to find,
covered in many engineering texts, but I am too lazy at the moment.


On 12/2/2024 3:44 PM, don Root wrote:
Richard, ???The old formula I learned is X= 2πfL.

?for 60 cycles--- ?6.28 **60** 12 = 4521.6 ?[a lot of X-ohms ?]
?compared to 85 R-ohms, but that must be the magnetizing inductance at
some low voltage. ?

yes turns ratio measured by voltage ratio would help
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: Identify transformer

 

开云体育

Richard, ???The old formula I learned is X= 2πfL.

?for 60 cycles--- ?6.28 *60* 12 = ??4521.6 ?[a lot of X-ohms ?] ?compared to 85 R-ohms, but that must be the magnetizing inductance at some low voltage. ?

yes turns ratio measured by voltage ratio would help

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io
Sent: Monday, December 2, 2024 6:11 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] Identify transformer

?

This is still an odd transformer. There have been systems of color
code for transformer leads for many decades. In some cases manufacturers
had their own codes, usually shown in their catalogs. In most cases
there is a code to show starting and finishing sides of each winding.
Someone who knows more about transformer design might be able to
tell from the inductance whether this is a power or audio transformer.
You can't really tell turns ratio from DC resistance since the windings
may have different size wire. Inductance will tell more but the
inductance of an iron core inductor will vary with the level. Probably
putting a low voltage on one winding and measuring the voltage on the
other will tell you what the turns ratio is. Its open frame so one can
?

??


--
don??? va3drl
861 - 880 of 31979