From: "Al Parker" 
Subject: Re: [drakelist] TR-4 with one distorted sideband


HI Tom,

    Jim Quinn has mentioned the early soupcan filters.  I rean some tests
on 3 of them a few yrs ago, I've  pasted them in below, you may need to
adjust for the margins.  The info may answer some of your questions on
freq., etc.   You should make sure your carrier freq. is, in fact, inside
the upper & lower freqs., and centered.  I've had one that fell outside,
and the filters were OK.

                I have run tests on 3 different "soupcan" filters, to
determine actual frequency, and loss.  Input & output were each loaded
with 3300 ohms.  URM 25D signal generator, Tektronics 453 scope, DSI 5600A
freq. ctr used as test instruments.



filter #1    "X" freq.  9000.8kc    7.2  db loss    3.3 kc difference in
freq.

                "-" freq.     8997.5       10.1 db loss    2.9 db dif in
loss



filter #2     "X" freq.  9000.5      1.9 db loss       2.7 kc difference
in freq.

                 "-" freq.     8997.8      7.9 db loss         6.0 db dif
in loss



filter #3    "X" freq.  9000.1       4.9 db loss         2.8 kc difference
in freq.

                "-" freq.     8997.3       4.6 db loss           0.3 db
dif in loss



#1 has shifted some in frequency,  #2 will give too much loss on one
sideband,  #3 should be usable, maybe #1



Even if you have a later TR-4, the freq.s will be about the same, note
that the carrier freq. in the above all falls just below 9.000.

73,

Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info




----- Original Message ----- 
From: "Tom Laird" 
To: 
Sent: Thursday, November 27, 2003 1:23 PM
Subject: [drakelist] TR-4 with one distorted sideband


>
> I an trying to fix a TR-4 with one distorted sideband for a local old
> timer. I already replaced the
>  9.000mhz crystal hoping that was the problem, but didn't fix it. Now I
> am thinking it may be one of the filters. but it hard to figure out
> which one because of the funky way Drake does it's sideband switching.
> Am I on the right track? And how can I tell which filter may have the
> problem? One more question. What frequencies are the two filters suppose
> to pass?
>


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