[R-390] GR 1001-A Signal Generator retry with details

[Barry]

One nice feature of those generators is a separate 2V output that can be switched in.  You can hang your frequency counter off that and, by switching the output to the 2V setting, monitor your counter while changing frequencies.  When you get it set, then switch back to the normal output.  It keeps counter noise out of the output signal.

One other thing to note is the output impedence changes between 10 ohms and 50 ohms depending on the output attenuater's setting.  I made a smal 50:1l matching box for this if anyone needs it.

Barry - N4BUQ


 On Thu 19/01/12 12:36 PM , "Bill Hawkins" bill at iaxs.net sent:
> Not many replies to the sketchy note I sent last week. Maybe if I
> added some details I could send this classy GR instrument to a new
> home. It can't stay here.
> 
> So I took it out, brought it up on a Variac, and monitored the B+.
> No problems and no smoke, all functions working. Put it back in the box
> and tested the dial extremes, all ranges are within the +/- 1% spec.
> The 15 to 50 MHz range has trouble at the low end, but is usable above
> 17 MHz. No other ranges fall off like that. 18 MHz (a dial mark) reads
> 17.9 MHz on the counter, and 50 MHz reads 49.5.
> 
> Not sure the Racal-Dana 1992 counter is rated for 50 MHz, but
> there are six zeroes after the leading 1 for 10 MHz from an HP Z3801
> GPS receiver.
> 
> Burned it in for 2 hours, mostly within the 0.25% drift spec. It comes
> with a manual with schematic and alignment instructions. The alignment
> tool is still clipped inside the case. I don't have an RF voltmeter, so
> I can't comment on output voltage accuracy.
> 
> FWIW, power consumption at 115 VAC line is the rated 65 watts.
> 
> There are no obvious scratches on the case or front panel, but there
> is light corrosion of the nickel plating. It should have its face
> washed, but I'd rather the new owner did that. It looks and smells 
> brand new inside the case. Pictures on request.
> 
> I'm asking $120 for it, but I'm influenced by a good story about why
> you want it. Money isn't everything.
> 
> The generator itself is 21 wide, 14 high, 11 inches deep, and weighs
> 54 pounds. I'd be shipping from zip 55438 in Bloomington, Minnesota.
> 
> Bill Hawkins
> 952-835-6840
> 
> Former owner of an R389, 90, 90-A, 91 and 92. Still have some manuals. 
> 
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