Here's a better picture and block diagram of the RCA 7016 FM
Exciter. The motor can be seen in the center. Notice that the
plastic compartment that has the flywheel for the motor also has
about 1/4" of silicon oil to act as a damper to prevent low frequency
sound such as thumps from causing it to unlock.
See:
<http://www.pa.msu.edu/~edmunds/Tube_FM_Exciter_Transmitter/rca_mi_7016_fm_exciter_reactance_tube.pdf>http://www.pa.msu.edu/~edmunds/Tube_FM_Exciter_Transmitter/rca_mi_7016_fm_exciter_reactance_tube.pdf
Burt
RCA made the MI-7016 exciter for their early FM transmitters that was
all tube, and phase locked to a crystal that was in the 100 kHz
region. The crystal frequency was determined by dividing the desired
operating frequency (88 to 108 MHz) by1296. It was lovingly called,
"The Iron Fireman". It had a two-phase motor that drove a capacitor
in the oscillator tank. It really did perform well, even by today's
standards. I think it was originally a Western Electric
design. When the 7016 exciter first came out the FM band was 44 to
54 MHz, but when the band moved up to 88-108 MHz the transmitter
design added a 4-125A double stage right after the exciter. Some of
these rigs were still operating well up into the 70's See:
<http://www.radiomuseum.org/r/rca_fm_exciter_unit_mi_7016mi.html>http://www.radiomuseum.org/r/rca_fm_exciter_unit_mi_7016mi.html
I had a 1 KW version of it on Two-Meters for a short time. I still
have the crystal from the exciter that put the transmitter on 146.40 MHz.
Now you have some ideas to go with to begin your project. :>
Burt, K6OQK
From: Didier Juges <shali...@gmail.com>
A real treat would be to do the GPS receiver with tubes ;)
Didier
Joseph Gray <jg...@zianet.com> wrote:
>>Otherwise you might just as well lock it up instead.
>
>Hmm, a 1970 vintage tube transmitter with a GPSDO frequency lock :-)
>
>Thanks to everyone for the suggestions. I will spend more time with
>this
>rig and see what works.
>
>Joe Gray
>W5JG
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
www.biwa.cc
K6OQK
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