[Swan] 250C

[n4tua at aol.com]

Glen,
I do have a signal generator. URM-25? and the 250C does not hear the 
signal very well. I am using about .5uV with 30% modulation and can 
just make out the signal as audible. Maybe I am not using enough 
signal. When I go up to say 5uV there seems to be little change in 
audio output. The 250C sure hears that whatever it is signal from my 
TS-140S receiver. I think I will take the frequency counter and sniff 
around the Kenwood and fine out what frequency that is and about how 
strong it is. I am stumped this time.
Thanks, Collin


-----Original Message-----
From: Glen Zook <gzook at yahoo.com>
To: Discussion of equipment manufactured by Swan <swan at mailman.qth.net>
Sent: Fri, 27 Jul 2007 11:19 am
Subject: Re: [Swan] 250C



You really need to get a signal generator with a
calibrated output. There are quite a few older
tube-type generators that can be obtained for under
$100 that work quite well (some "well under").
Generators like the Measurements Model 80, the HP 606
and 608, military URM-25, URM-26, TS-497 series, and
so forth can be found fairly easily.

You are going to just "chase your tail" trying to
determine the sensitivity of any receiver without
having the proper test equipment.

Glen, K9STH


--- n4tua at aol.com wrote:

I still continue with the 250C. It seems deaf but is
it really? I have been doing some A/B testing using
the Swan 250C as (B), and the Kenwood TS-140S with a
homebrew 6 meter converter as (A). The Kenwood hears
very well I think but the 250C does not seem to hear
any signals yet. I have check about everything I know
to check and the receiver seems to be correct. Still
no signals OTA. I did notice that while A/B testing
that the 250C picks up a signal +10db over from the
Kenwood. When the Kenwood is at about 10.239mhz the
250C hears a loud signal at about 50.045mhz. Not sure
what this is but it is coming in through the antenna
on the 250C. With the coax disconnected and a wire on
the antenna connector the signal increases. Any
ideas?









Glen, K9STH

Website: http://k9sth.com



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