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

[DeWitt Clay]

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, 37,37) employing an extra audio stage to drive 
high or low impedance headphones. It is also a Xtal-Heterodyne type also 
employing 10 xtals for check points but these are mainly ground for harmonic 
operation except for a few direct frequencies on the low range. Range 200 to 
1500 KC and 3000 to 13575 KC. Got to get this out, hi! More next time.
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