[ARC5] [Milsurplus] Pre-WWII Aircraft Radio Transmitters

[jcoward5452 at aol.com]

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, 
he Navy had the LJ and LM frequency meters to set up the GO, GP, GF on 
requency. The specs for the GO (1933) called for the rig to 
aintain a given frequency setting to +- .05% of F. The GO-3, GO-7, GO-8, and 
O-9 Westinghouse rigs are most likely similar in design and 
ppearence. The data for the GO-3 (1933) and GO-9 (1940) shows that quite 
learly. I have no data on the tube lineup for the GO-1, GO-2, GO-4, GO-5, GO-6 
o I can't comment. I'm making an educated guess that the Westinghouse GO-7, and 
GO-8 closely follow the GO-3 and GO-9 in appearence and design. 
73, DeWitt N4QNX 


---- Original Message ----
rom: Ray Fantini <RAFANTINI at salisbury.edu>
o: DeWitt Clay <n4qnx at yahoo.com>; milsurplus <milsurplus at mailman.qth.net>
ent: Sun, June 12, 2011 1:04:02 PM
ubject: Re: [Milsurplus] Pre-WWII Aircraft Radio Transmitters
More on the GO series, the GO transmitter used two 860 (VT-17) tubes in a MOPA 
ircuit and  that tetrode was introduced  in March of 1929, a master oscillator 
A type transmitter of that era (1930-33) would be inherently unstable and 
roduce little power at frequencies above 20 MHz. In a MOPA circuit every tuning 

djustment can have an effect on stability and frequency. In the early thirties 
t was difficult to determine power or frequency above 20 MHz, no less produce a 

orking reliable design that can be bolted into an aircraft. I can see the older 

eries GO transmitters working great up to 9 or 12 MHz  but 25 or 26 MHz another 

hing entirely. The GO-3, GO-7, GO-8, GO-9 used three tubes, a oscillator, 
river to decouple the oscillator from the PA and a 803 PA. 

ay more stable design but still subject to instability from shock and 
ibration. I will still stand by my earlier statement that the PA of the 
rimitive GO series was capable of being configured as a doublers or maybe 
ripler to have the transmitter be able to operate the oscillator at a lower 
requency with improved stability with the LO set to 5.25 MHz and the output 
ank tuned to 21.0 MHz you’ll get something on 21.0 and a lot of stuff on 10.5 
oo, all reasons to support a radical redesign as evidence by the apparent 
ifference in GO-7 and above transmitters. Need a schematic to answer that 
uestion.
ay F
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