[Heathkit] SB-102 mods

[Greg Mijal]

Hearhkit put out a mod that changed the resistor you are speaking of from 
100K to an 82k.
I had so many problems tweaking the S meter behind the front panel  of my 
101 that I used a larger sized 200 ohm pot and bolted it on a piece of 
copper on top of the vfo.  The rig works better too.
73's
Greg
WA7LYO
Kinston NC
----- Original Message ----- 
From: "Drew P." <drewrailleur807 at yahoo.com>
To: <heathkit at mailman.qth.net>
Sent: Wednesday, August 18, 2010 12:48 AM
Subject: Re: [Heathkit] SB-102 mods


> Paul wrote:
>
> "Have encountered several modifications to an SB-102
> Not being intimately familiar with the 101 / 102 I am asking group for
> anyone recognizing the mods and their possible validity
> #1 An extra trim pot in series with the original S meter zero. There are
> several other resistor changes as well."
>
> My SB-101 had a similar modification.  The S meter would not zero.  I 
> believe that the pot was a kludge to atempt to compensate for a circuit 
> fault. The actual fault was that one of the 100k resistors in the s 
> metered IF amplifier's screen circuit had opened. Replacing the open 
> resistor, replacing the out-of-tolerance other 100K screen circuit 
> resistor, and removing the mod restored setability to the s meter zero.
>
> Many 100k resistors and many other high resistance resistors in this radio 
> were way out of spec, 500% and more and some outright open.  This caused a 
> number of faults.
>
> "#2 An added trim pot added to the board near V19. Turning the pot changes
> the frequency."
>
> I am not familiar with this one. Perhaps it is to add RIT?
>
> Drew
>
>
>
>
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