[Milsurplus] T-827 Part 1

[Brad Latta]

Here are the instructions for ligning up the Spectrum
Generator module in the Synthesizer section of this HF
transmitter. It is located on the R.H.S. just in front
of the 5Mcs frequency standard, looking from the
front. There are 3 sections to this module, a 100Kc
spectrum, a 10Kc spectrum & either a 5kc or 1kc
spectrum. The 100kc section is a divide by 5, so it is
the 1st section from where the 500kc signal is input
(J3). set up the signal generator for a 500kc signal
of -6 dBm, & input to J3. Power of +20Vdc should be
applied to the +ve terminal, (red). Dont forget to
ground the chassis! Using a frequency counter, align
the multiturn pot in the 100kc section for 100kc
frequency output on J6. This output will 'lock' to the
incoming 500kc signal. Adjust the pot for midrange
locking. If there is no 500kc input, the output will
drift. 
       Align the 10kc,5kc &/or 1kc spectrum the same
way.
       Using a Spectrum Analyser, (a good modern
accurate one is good for this!), for the 100kc section
set the start frequency to 15.3Mcs & stop freq to
16.2Mcs. Tune the ferrite slugs (T1,L5 & T2) for
Maximum center frequency amplitude (15.75Mcs). The
diplay should look like a 'hill', with a peak & sides
that slope down either side. depending on the
resolution there may be smaller peaks & dips, but the
overall shape is a 'hill'.
       Tune the other sections in the same way, the
10kc section is start 3.82Mcs & stop 3.91Mcs (center
3.865Mcs)
       1kc section start 122kcs, stop 131kcs
       5kc section start 110kcs, stop 115kcs
  Sorry for the bandwidth, but hope this helps those
with T-827 transmitters, the spectum generator is a
critical part of the synthesizer!
                                   Brad


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