[R-390] HP-606* vs URM-25*?

[ELDIM]

Hello Tom & Crew,
The HP-606A is definitely a step up from the vintage AN/URM-25(*) series
Signal Generators.
However, the URM-25 Series did have a feature that I admired and appreciated
which was the external X200 microvolts that was sure handy to keep a Freq
Meter connected to. The 25 covered 10 KHz to 50 MHz in eight ranges, whereas
the 606A covers 50 KHz to 65 MHz in six ranges.  The 25 is smaller, lighter,
and takes up much less bench space but that is where it ends. The 606A has
much better accuracy of 1 % plus 100 Khz  & 1 MHz internal Calibrator. The
606B was another step up but required the HP 8708A Synchronizer that
provided PLL plus some more amenities. Of course, you can use it without the
synchronizer and essentially you still have a 606A.  The 606A sold for $1350
back in 1963. I have used both in the Air Force from 61 but the 25 was
replaced by the 606A somewhere along the line.  Wealso had a HP-608 Series
which covered 10 MHz up to 400 + Mhz depending on the model.  This was also
a very nice generator for its time and its' earlier military counterpart
from the AN/URM-26 series. In any event, either generator is very capable of
aligning radios receivers from the bygone era. Ypou're sure to fall in love
with the 606A on your journey to upgrade. I now use the 8640B which is the
"cats meow".  There are a lot of other signal generators that fill the bill
as well.

73,
Glen Galati, KA7BOJ
Tacoma, WA
eldim at att.net

----- Original Message -----
From: "Tom Norris" <r390a at bellsouth.net>
To: <boatanchors at theporch.com>
Cc: <R-390 at mailman.qth.net>
Sent: Monday, January 17, 2005 10:26 PM
Subject: [R-390] HP-606* vs URM-25*?


> I've had a URM-25D for years and have
> never had any problems. I ran across an
> HP-606A recently and it's in the process
> of being shipped.
>
> I've never used a 606, (though I've used
> a 608 for higher freqs.) How does the
> HP-606 compare to the URM-25D?
> At the very least, it seems to be heavier.
>
> Thanks
>
> Tom NU4G
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