[Premium-Rx] The "Sound" Of Receiver IF Amplifiers

[Carcia, Frank A. HS]

The R7 has a third IF 50 kHz if I recall. This is similar to the R4. The TR7
is set up to
run 12 volts and has a couple inverters to generate minus voltages and a
higher positive voltage. These inverters have been known to generate noise.
I think there are modifications out there to fix this noise problem. There
is also a regulator modification for the pto to
reduce noise coming out of it.  fc

-----Original Message-----
From: Ed Tanton [mailto:n4xy at earthlink.net]
Sent: Tuesday, October 07, 2003 6:38 PM
To: premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] The "Sound" Of Receiver IF Amplifiers


Hi Bob... I own R-7 production prototype number XXX 3 
<http://www.qsl.net/n4xy/Images/Electronics/Ham_Radio/Receivers/Drake/rcvr_D
rake_R-7_01.jpg> 
and <http://www.qsl.net/n4xy/receivers-3.html> purchased from Mike Elliot, 
W8KRR, who-along with Jim Jaeger-were the 1st two engineers on the TR-7 
project at Drake. This receiver was Mike's own. To the best of my 
knowledge, the receivers in the TR-7 and R-7 are essentially the same. The 
R-7 adds some antenna switching functionality, and a preamp. The primary 
difference between the x-7 series and the x-7A series is an added lightning 
protection discharge 'tube'. More information is available in John 
Loughmiller's book about Drake: "A Family Affair". Note that is MY R4-B 
dial on the back cover.


73 Ed Tanton N4XY <n4xy at earthlink.net>

Ed Tanton N4XY
189 Pioneer Trail
Marietta, GA 30068-3466

website: http://www.n4xy.com

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LM: ARRL QCWA AMSAT & INDEXA;
SEDXC NCDXA GACW QRP-ARCI
OK-QRP QRP-L #758 K2 (FT) #00057

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