At least in the later R-4Cs, the 2.4 filter is mounted inside under the chassis
in the rear. The external mounted filters are 1500, 500, 250.
73,
Bob WW3QB
________________________________
Steve,
The 2.4 filter plugs into the back....as does the 1.5, .5 or whatever you want
in those slots. The 2.4's are pretty available.
There is a front end filter and I think it is 8khz on the chassis.
I'm going from memory here...whaich may be ok. most of the time....-:)
73,
Lee
-----Original Message-----
From: Steve Wedge <[email protected]>
To: Drake List <[email protected]>
Sent: Tue, Jan 31, 2012 7:11 pm
Subject: [Drakelist] R-4C 2.4 filter bad?
I haven't dug into this receiver yet, but it seems to me that the 2.4 kHz SSB
filter is bad. R-4C, late serial number.
* Using the S-meter, the signal strength of the calibrator is lower in 2.4 by
10 dB, than the reading in both 1.5 and .5.
* The decrease in gain is solid and not intermittent. Rocking the MODE switch
doesn't reveal any changes.
* It's also a noticeable loss listening on-the-air.
I see what appears to be the filter on the top side of the chassis, under where
the two carrier oscillator crystals are. Has anyone had any grounding issues
with this filter that have fixed a similar problem? I figure if there's a bad
ground, it could affect the insertion loss of this filter.
If it's bad, then comes the pain of finding a replacement. If anyone has an
extra one for sale, let me know.
Steve Wedge, W1ES/4
Live free or die: Death is not the worst of evils.
John Stark.
All my computers have my signature with various pearls of wisdom appended
thereto.
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