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uBitx with first mod and question

 

Here is my uBitx after first mods. I added a Sotabeams CW audio fiilter. The old TR switch now controls the filter. Down is the original wide SSB, middle is the normal CW and top is narrow CW. The right light is spot indicator controlled by the CW filter and lights when you are well tuned. Unfortunately adding the filter (goes before final AF amp)? raised the receiver noise. I'm working on shielding to restore the original performance.? Suggestions would be appreciated.
It still needs anti pop, a better bezel, ...

Karl Schwab
 

Mods sound good, but to a "rare" Heathkit? Benton Harbor Lunchbox?? Karl


On Tuesday, January 9, 2018 8:53 AM, KD8CGH <rkayakr@...> wrote:


Here is my uBitx after first mods. I added a Sotabeams CW audio fiilter. The old TR switch now controls the filter. Down is the original wide SSB, middle is the normal CW and top is narrow CW. The right light is spot indicator controlled by the CW filter and lights when you are well tuned. Unfortunately adding the filter (goes before final AF amp)? raised the receiver noise. I'm working on shielding to restore the original performance.? Suggestions would be appreciated.
It still needs anti pop, a better bezel, ...



[email protected]
 

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Rare? I have over 15 of them $ 5.00 at swat meet's many times FREE.


On 1/9/2018 9:23 AM, Karl Schwab via Groups.Io wrote:

Mods sound good, but to a "rare" Heathkit? Benton Harbor Lunchbox?? Karl


On Tuesday, January 9, 2018 8:53 AM, KD8CGH <rkayakr@...> wrote:


Here is my uBitx after first mods. I added a Sotabeams CW audio fiilter. The old TR switch now controls the filter. Down is the original wide SSB, middle is the normal CW and top is narrow CW. The right light is spot indicator controlled by the CW filter and lights when you are well tuned. Unfortunately adding the filter (goes before final AF amp)? raised the receiver noise. I'm working on shielding to restore the original performance.? Suggestions would be appreciated.
It still needs anti pop, a better bezel, ...




 

I'm well familiar with the Heathkit? Twoer "Benton Harbor Lunchbox". I built one a in Junior High school shop many decades ago. It disappeared from my life over the years.
This Sixer was not only dead but decomposed. Although I could scrub off the case, it's insides were covered in some kind of corrosion that didn't just come off.
 

More info on the mod. I added wires:
? from the volume wiper to the rotary center.
? from rotary position 1 to Audio connector (original wiper destination)?
? rotary 2 & 3 to AF filter in
? AF filter out to tie point at rotary rotary 1 (back to Audio connector)

I tried replacing the wires with shielded mono audio cable with one end of shields tied together and grounded but it didn't help.
The filter itself is on a perfboad mounted to the right edge of the speaker so it is also very near the Raduino.

Any suggestions on next thing to try?
Vince Vielhaber
 

Looks great!!!

Vince.

On 01/09/2018 08:52 AM, KD8CGH wrote:
Here is my uBitx after first mods. I added a Sotabeams CW audio fiilter.
The old TR switch now controls the filter. Down is the original wide
SSB, middle is the normal CW and top is narrow CW. The right light is
spot indicator controlled by the CW filter and lights when you are well
tuned. Unfortunately adding the filter (goes before final AF amp)
raised the receiver noise. I'm working on shielding to restore the
original performance. Suggestions would be appreciated.
It still needs anti pop, a better bezel, ...
--
Michigan VHF Corp.

Dave Bottom
 

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That Sixer package looks great!?

Now you just need to add filters for 6M and maybe a pair of RD16HVF1s in the PA! ? LOL

I was already imagining adding 6M.

Dave WI6R

Sent from my iPhone

On Jan 9, 2018, at 6:23 AM, Karl Schwab via Groups.Io <ktschwab@...> wrote:

Mods sound good, but to a "rare" Heathkit? Benton Harbor Lunchbox?? Karl


On Tuesday, January 9, 2018 8:53 AM, KD8CGH <rkayakr@...> wrote:


Here is my uBitx after first mods. I added a Sotabeams CW audio fiilter. The old TR switch now controls the filter. Down is the original wide SSB, middle is the normal CW and top is narrow CW. The right light is spot indicator controlled by the CW filter and lights when you are well tuned. Unfortunately adding the filter (goes before final AF amp)? raised the receiver noise. I'm working on shielding to restore the original performance.? Suggestions would be appreciated.
It still needs anti pop, a better bezel, ...

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<hw3s.jpg>
 

I found out that the problem the noise was caused by a poor ground. If the filter is very well grounded it works well with no additional noise.
??? 73
???? Bob?? KD8CGH
 

you willing to part with 2 of them at 10 bucks a piece plus shipping

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