'Twas looking at it this evening, and this is going to take some
disassembly. I wish it had the same form factor as the optional filters so
I could try moving/swapping it.
Am I correct in assuming that I could jumper this filter with a 150 ohm
resistor to check the signal level? I'm just wanting to be sure that the
filter really is bad before going through the time and expense of replacing
it (after all, it could be a switch contact). The case is making good
contact with the chassis and GND.
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.
--------------------------------------------------
From: "Garey Barrell" <[email protected]>
Sent: Tuesday, January 31, 2012 11:00 PM
To: <[email protected]>
Cc: <[email protected]>; <[email protected]>
Subject: Re: [Drakelist] R-4C 2.4 filter bad?
Lee -
No, the 2.4 kHz filter is under the chassis, along the back wall.
I know all about that 'memory' stuff! :-)
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
[email protected] wrote:
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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