[ARC5] Frequency Meter?

[Fuqua, Bill L]

Mistyped I was referring to the GR 1001A
________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of Fuqua, Bill L [wlfuqu00 at uky.edu]
Sent: Wednesday, February 15, 2017 2:15 PM
To: Richard Knoppow; arc5 at mailman.qth.net
Subject: Re: [ARC5] Frequency Meter?

   I wonder if the 805B will also produce SSB like the GR101A.
Now, that I have gotten your attention, I have to explain.
   In 1968 I was working in a lab at Tennessee Tech University checking out my
newly acquired SB8b T-1000 spectrum analyzer. The best signal generator available was a
GR 1001A. The SB8 T-1000 had a 5 MHz first IF and and a 6BE6 mixer. So you could either
enter enter a 5 MHz signal and analyze it directly or inject a local oscillator signal and observe
signals up in to the UHF bands.
   I tuned the GR signal generator to 5 MHz ( top end of the dial) and observed the carrier.
All was fine and good. Was getting excited not that I had a my own working spectrum analyzer.
I then added the modulation, and saw that I had the carrier and only one side band, the upper
side band.  I was sure  that something was wrong with my spectrum analyzer. I then switched
the 1001a to the next band up (5-15MHz)  where the tuning cap was at max. at 5MHz and saw both
sidebands. That was when I realized the signal generator was generating both AM and FM. The
modulated output tube was acting somewhat as a reactactance modulator and frequency modulating
the oscillator. The AM upper sidebands were in phase and adding while the lower sidebands were
out of phase and canceling.
  Since I have come across several 1001a signal generators and observed they all do the same
thing. SSB full carrier when set to just the right frequency.

73
Bill wa4lav

________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of Richard Knoppow [1oldlens1 at ix.netcom.com]
Sent: Wednesday, February 15, 2017 12:49 PM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Frequency Meter?

    General Radio 805B.  It appears in the 1939 GR catalog which is
available from   http://www.ietlabs.com/
    The GR version comes with a separate power supply which is contained
in the same cabinet. There was probably an 805A but  don't have
information on it.

On 2/14/2017 10:38 PM, Fuqua, Bill L wrote:
>    Looks like the predecessor to the GR 1001a signal generator.
> Also appears to use external power supply.
> It is a signal generator. AM modulated with calibrated signal level output.
> Very nice for the time.
> 73
> Bill wa4lav

--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
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