[Milsurplus] Fw: Pre-WWII Aircraft Radio Transmitters & Frequency Meters

[DeWitt Clay]

Jay, 
I made a few corrections below as on the tubes used in the LJ-1, etc.. There is 
also a six page description in the text of the new LM model employing an AT cut 
Xtal and 3 tubes: 77, 6A7, and 76. The author notes at the time of writing of 
May, 1936 that further information on the LM will be forth coming in manuals 
issued with the equipment. Range 195-20000 KC.

Receivers: from August 1936 Navy Aircraft Radio pamphlet
The RU is the receiver described as standard for all aircraft. The RU-2, RU-2A, 
RU-3, and RU-4. The RU-2A and RU-3 are describes in detail. It further states 
that the RU-2A was designed for beacon instalation and is electrically identical 
to the RU-2. Improvements incorporated in the RU-3 include CW reception and 
AVC. It states the RU-4 is similar to the RU-3.

Receivers listed in use in the December, 1942 Aircraft Radio pamphlet:
RU, RAX, and ARB

73, DeWitt  N4QNX




________________________________
From: "jcoward5452 at aol.com" <jcoward5452 at aol.com>
To: n4qnx at yahoo.com; milsurplus at mailman.qth.net
Sent: Mon, June 13, 2011 9:56:40 AM
Subject: Re: [Milsurplus] Fw: Pre-WWII Aircraft Radio Transmitters & Frequency 
Meters

Thanks DeWitt.
 That is very interesting.Anyone actually have an LJ?
 Jay KE6PPF




-----Original Message-----
From: DeWitt Clay <n4qnx at yahoo.com>
To: milsurplus <milsurplus at mailman.qth.net>
Sent: Sun, Jun 12, 2011 8:09 pm
Subject: [Milsurplus] Fw: Pre-WWII Aircraft Radio Transmitters & Frequency 
Meters


  I got out the chapter on Frequency meters from the 1936 Aircraft Radio 
pamphlet  and have started to look it over. It states that the LJ and LJ-1 were 
the the  meters availible for use to set up transmitters and receivers at the 
time of  writing the pamphlet. The LJ was used with  the GO transmitter. It 
states that  the LM was coming out at about that time, said to be very promising 
with its  single, low drift AT cut xtal and likely superior to the LJ. The LJ 
meter  somewhat resembles the LM in appearence, size, and power 
requirements. The LJ is  a 3 tube set employing a 75, 6A7, and 37. Frequency 
coverage given as 200-1500  KC and 2000-13600 KC. The LJ is a Xtal 
Oscillator-Heterodyne type like the LM  but had 10 Xtals ground to Navy 
frequencies (X or Y cut) for direct checks also  for calibrating the heterodyne 
oscillator as in the LM we are familiar with. The   LJ-1 is a 4 tube affair (37, 
6A7, 75, 37) employing an extra audio stage to drive  high or low impedance 
headphones. It is similar to the LJ type frequency meter  employing 10 xtals for 
check points also but these are ground for harmonic  operation except for a few 
direct frequencies on the low IF range. Ranges 200 to  1500 KC and 3000 to 13575 
KC. Power for the LJ and LJ-1 is from RU junction box.  73, DeWitt  N4QNX     
________________________________ From: "jcoward5452 at aol.com" 
<jcoward5452 at aol.com> To: n4qnx at yahoo.com; milsurplus at mailman.qth.net; 
arc5 at mailman.qth.net Sent: Sun, June 12, 2011 5:29:57 PM Subject: Re: 
[Milsurplus] Pre-WWII Aircraft Radio Transmitters  Hello DeWitt,  First I've 
heard of a LJ frequency meter. Can you descibe and elaborate? Do any   exist 
today? What time frame was it used? WW I or between the wars? I am  intrigued! 
 Thanks,              73 Jay Ke6PPF     -----Original Message----- From: DeWitt 
Clay <n4qnx at yahoo.com> To: milsurplus <milsurplus at mailman.qth.net> Sent: Sun, 
Jun 12, 2011 1:00 pm Subject: Re: [Milsurplus] Pre-WWII Aircraft Radio 
Transmitters   Ray,  The Navy had the LJ and LM frequency meters to set up the 
GO, GP, GF on   frequency. The specs for the GO (1933) called for the rig to  
maintain a given  frequency setting to +- .05% of F. The GO-3, GO-7, GO-8, and  
GO-9 Westinghouse  rigs are most likely similar in design and  appearence. The 
data for the GO-3  (1933) and GO-9 (1940) shows that quite  clearly. I have no 
data on the tube  lineup for the GO-1, GO-2, GO-4, GO-5, GO-6  so I can't 
comment. I'm making a  guess that the Westinghouse GO-7, and   GO-8 closely 
follow the GO-3 and GO-9 in   appearence and design.   73, DeWitt N4QNX   
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