[FoxHunt] HTX-202 Audio S-Meter Mod

Thu, 6 Jun 2002 12:41:54 -0400

IC4 is a Motorola mc3372 IF strip.  Check the link:

http://pubpages.unh.edu/~aperkins/pdf/mc3372.pdf

Pin 13 is labeled Meter Drive and in one of the diagrams is labeled RSSI
Output which I believe is the S-Meter output of the chip.  In the HT
schematic this is connected back to pin 10, Filter Input.  Filter output,
pin 11 appears to be DC coupled and drives a line labeled SGL.  The junction
of R33 and R34 might be a possible S-meter dc voltage pickoff point.

Let me know.

73, Jess, w4pqk

-----Original Message-----
From: Marvin Johnston <[email protected]>
To: [email protected] <[email protected]>
Date: Thursday, June 06, 2002 11:34 AM
Subject: Re: [FoxHunt] HTX-202 Audio S-Meter Mod

>
>Bob Simmons, WB6EYV, taps into the HTX-202 S meter circuit to use the
>HTX-202 with his Yagi Plot setup. I checked his website
>(http://www.silcom.com/~pelican2/) but didn't see any mention of the
>mods. He does read this list, and can probably answer the question.
>
>Marvin, KE6HTS
>
>Dennis Boone wrote:
>>
>> As an electronic technician, I'm not a bad computer sysadmin, but I
>> went looking for such a point a few years ago for exactly the same
>> reason.  My fuzzy memory seems to recall that the only place s-meter
>> intelligence was available outside of an IC was in a form suitable for
>> driving a display, e.g. bcd, serial, or some such.  I'd love to be
>> proven incompetent on this one, though.
>>
>> Dennis Boone
>> KB8ZQZ
>>
>>  > I know a ham that claims to have done most of the factory service work
>>  > on the 202 for RS.  I posed the same question him a few years ago and
he
>>  > could not come up with a point.  He seemed to be sincere  but you
never
>>  > know.  The tight front end would make it a great fox hunting rig.
>>  > Please post the information if you find a mod.
>>
>>  >  > Has anyone ever tried to find a point on the Radio Shack
>>  >  > HTX-202 HT PCB to tap off the voltage/signal from the
>>  >  > S-meter display circuit chain?  I'd like to see if I can add
>>  >  > a voltage driven osc for a audio S-meter to a -202.
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