[R-390] sweep alignment

[Tom-WB3AKD]

Steve,

I'm using an HP 3336B which is a synthesized level generator.  This is a
fairly smart box that allows you to set start and stop frequencies and its
as dead on as you would ever need at 455.  Also has a sawtooth output for
driving the X-axis on the scope.  I;s seen the for < 200 on the big "E".
Paid $50 buck for mine at a hamfest, but if I  keep the top cover on, it
sometimes won;t boot.  Havent figured out what that's about yet.

Down sides:  Weird output connector (WECO) adaptor about 15 bucks at
Trompeter.   Minimum output level -72 dBm which means you need additional
attenuators to get the level down to run the IF at max gain.  Also has no
internal mod source although will amplitude and phase modulate with external
audio source.

Up side:  GPIB compatible (if you're into automation): coverage from audio
tol 21 MHz in teensy steps.  Up  to 60(?) MHz output on the back with no
level control.

Can specify sweep range very precisely which is a big plus for sweeping IF's
and filters etc.

A pretty $#/^-Hot tool from my point of view.  I once used it to verify the
sampling rate on an A/D converter.  Took 256000 samples of 1KHz, did an FFT
(that took a while) and then looked for which BIN the peak showed up in.
Worked great and shut down the weenie that was trying blow up our test
procedure.

Setup:  3336B (via attenuator) drives IF input (Alternately the antenna
input but better to use IF input) at low level (keep from saturation the IF
when in MCG mode at Max RF gain).  Sweep output from 3336B drives X-axis of
Tek 475 scope.  IF output from Rx drives the V-axis of the scope.     Sweep
time of 10 ms for wide BW but need to drop it down to .1 sec for xtal
filters.

My two pence.

73

Tom WB3AKD

----- Original Message -----
From: "Steve Hobensack" <stevehobensack@hotmail.com>
To: <r-390@mailman.qth.net>
Sent: Sunday, January 12, 2003 10:22 AM
Subject: [R-390] sweep alignment


> What type/brand of sweep gen would be good? What is the hook-up? How would
> one install markers at 447 and 463kc? Thanks
> ......Steve....KJ8L
>
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