Steve,
What is the P/N of the 2.4 filter?
I may have a spare I could loan you to try out??
73,
Lee
-----Original Message-----
From: Steve Wedge <w1es1...@earthlink.net>
To: k4oah <k4...@mindspring.com>
Cc: Drakelist <drakelist@zerobeat.net>
Sent: Thu, Feb 2, 2012 1:02 pm
Subject: Re: [Drakelist] R-4C 2.4 filter bad?
Glad I had both you and the list in my reply - seems zerobeat is now
sending my
messages to Spam Purgatory for some reason. I shouldn't be surprised:
my whole
week has been like that.
I am with you, though, that there's probably an issue with the
connections. The
filter seems to be behaving properly aside from the tremendous
insertion loss.
The receiver itself has seen a bunch of modifications, so there well
could be
something that got disturbed. I'll be working to get it working as
best it can
- including trying to exorcise the tremendous amount of hiss in the
audio.
The weather is entirely too nice right now for me to be in the house
when I get
home, so this will probably wait until the weekend - when the temps are
supposed
to drop and it's supposed to rain some more.
I am still trying to remember why I saw a 150 resistor on the back
panel of my
first R-4C, under the filter cover...
73,
Steve, W1ES/4
-----Original Message-----
From: Garey Barrell <k4...@mindspring.com>
Sent: Feb 2, 2012 11:54 AM
To: w1es1...@earthlink.net
Cc: Drakelist <drakelist@zerobeat.net>
Subject: Re: [Drakelist] R-4C 2.4 filter bad?
Steve -
Well, I'm 0 for 2. The 2.4 kHz filter has a pin and a stud at each
end, while
the SSB/CW filters
have two pins at each end. Sorry. You can probably hold the filter
in place
on one of the sockets
to check it, but ...
I still suspect the coax from the filter or the switch....
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>
Bob Loving wrote:
Steve, I think Garey meant that the 2nd IF filters in the R-4C, like
the
filters in the TR-7, are
all designed for 50-Ohm terminations. That makes them quite easy to
test
outside of the receiver
or transceiver (or test the antenna to filter input or the filter
output to
speaker paths). The
8-kHz wide roofing filter and any of the Sherwood or Inrad
substitute roofing
filters are designed
for the 1-kilohm terminations mentioned by Garey. Any substitute 2nd
IF
filters are 50-Ohm designs.
Bob K9JU
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