[TMC] TMC Digest, Vol 87, Issue 3

[Richard Knoppow]

----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <tmc at mailman.qth.net>
Sent: Monday, September 17, 2012 9:39 AM
Subject: Re: [TMC] TMC Digest, Vol 87, Issue 3


> Bob,
>
> Don't know whether this will help or not but the TMC 
> document number for
> the MSR-4,5 manual is IN-196.  The TMC part number for Z1, 
> the 19.1 KC IF
> filter, is FX-153.  For Z2, the audio low pass filter, it 
> is FX-152.
>
> Robert D.
>
> In a message dated 09/17/2012 11:24:43 AM Central Daylight 
> Time,
> robt.mcclain at att.net writes:
>> Richard,
>>
>> I might be able to help you.  In your MSR/GSB manual, are 
>> there any
>> drawing reference numbers by the schematics you refer to 
>> ?
>>
>> I have the entire lot of TMC engineering drawings and 
>> might have something
>> like the graph you need.  But I need something to start 
>> with to find them
>> like a reference number, look closely.  I cannot 
>> guarantee anything though.
>>
>> Cheers,
>>
>> Bob McClain
>> K4ATP

    I may have a downloaded version of one of the MSR 
manuals but I can't find it at the moment.  There are 
sketches of the pass band on the schematics but they are not 
detailed.  I wondered how this filter compares with, say, 
the Collins mechanical filters of similar bandwidth.  The 
sketches suggest the TMC filter is a Chebichev (sp.) type 
which can have very good skirt steepness.  I need to 
re-organize my TMC stuff. One problem is that I had a great 
deal of stuff on a 1Tb drive that crashed. It was gathered 
when I had access to a very high speed connection which I do 
not at home so I can't really duplicate much of it.
    This is really idle curiosity since I have not found an 
MSR which I can afford.  I would love to find one to use on 
either an SP-600-JX or, it will work on a 500khz IF on an 
R-388.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com