The
AIRMEC type 871 ZD 00783 Oscillator Test No1 CT212
This signal generator covers 85Khz to 32Mhz in 7 bands, providing
carrier, AM and FM modulation.
It has a precision attenuator and has a highly ruggesdised cast
aluminium case that is fully sealed.
The construction method
and
techniques is strongly suggestive of Bristish Larkspur series of
military radio equipment . it can be powered by mains or battery.
The navy grey colour scheme is highly suggestive of having
been
made for the naval market, however naval equipment is never so heavily
ruggedised or even fully sealed. Internally it has been
constructed from quality mil spec components and construction is off
the highest quality.
I purchased this unit
for $10 at a
hamfest about ten years ago and has proven very usefull in keeping my
other military radios going. However, it is a bit sick now,
there
is a large amount of hum causing FM modulation and it isnt power supply
related.
There is one and only one design deficiency in this unit that annoys
me. The Tuning control on the front panel is mechanically
coupled to the dial and variable capacitor through a rubber friction drive.
This , I suspect, was designed to prevent backlash and permit
easy assembly of the front panel assembly to the oscillator sub
chassis. Over the years the rubber drive wheel has lost its
tackyness and it is quite hard to set the frequency precisely.
otherwise, given half an hour to warm up and thermally stabilise
its frequency stability is rock solid , as you would expect from its
biuld quality.
Mine still gets used to do actual work. Not bad for a piece of kit approaching 50 years.
but
now, thanks to the hard work of the people at VMARS, the complete EMER
(manual to you! ) is available here at www.vmarsmanuals.co.ok/archive/files_index.htm
some of the key words for documentation, EMER Tels
Z341 Z342 Z344 and also T&M F142 . Look
for documents numbers 1287,1288,1289 and 1290 which are
complete and contain the schematics.
They are a free download, but as they are
copyrighted to VMARS I cannot host the files here.
Wed Dec 12 13:35:35 EST 2007 created page
Wed Oct 8 14:08:38 EST 2008 email sig, VMARS
document download site
