Dana Whitlow writes:
> My dad worked in the absorption air conditioning field using ammonia and
> water,
> and he once told me that ammonia-water was hell on aluminum copper points, or
> even aluminum tubing that had impurities in the form of tiny copper flakes in
> it.
An aluminum-cop
Bob kb8tq writes:
>I think it’s safe to say that the interaction between the ammonia and whatever
>the
>structure is made of will be exciting on a number of levels. Corrosion is only
>the first
>item on a very long list ….
Just stick with a single metal and keep water away, and you sh
Just as a side note, the absorption refrigerator in my motorhome is loaded
with lots of copper tubing throughout, and the whole system is charged with
copious amounts of ammonia, so I would assume copper to be just fine from a
compatibility standpoint.
-Matt
Well aside from the fact that I have about one piece of gear that goes up
to 23 GHz. A old HP bolometer to a HP 431 meter. Still works from what I
can tell. Really nothing else in the shack. But ebay sure has plenty of
WR42 stuff. Unfortunately at those special ebay prices. So doesn't look too
like
I just stripped one of these units out of an Argo Systems AS-210 to use
as a stand alone reference.
The system ran before I did this, so I was sure all the hardware was
working.
It is marked FRK-L (manual says this the low temp operating version),
and says
Efratom p/n 2A5A2A. I did not see any
Hi
The “normal” FRK-L is the low phase noise version of the FRK.
There are two “external control” options. One is a 10K pot the
other is a EFC voltage. Simple answer is to short the wires / leave
them open.
The big deal is finding out if the beast still locks and how much
signal is getting to
As Bob says you can use an internal or external supply and 10K pot to
ground or leave open.
With respect to the internal regulator. I think there are two things at
startup: the voltage is higher and drops after ignition. So go with the 24V
supply about 2 amps should work and to some extent that wil
I was just looking at a HP8566, and found that it can reach the right
range, right on the hairy edge of its capability. It's specified range
is to 22 GHz, but you can tell it to go up to 24 GHz stop frequency -
beyond that it will ignore numeric entries, or adjust the other
parameters to limit it
If you look at the schematics of the C-field adjustment circuits, you'll
find where the tweaking is available for fine tuning the Rb system. I
think that's the only "frequency adjustment" spot to worry about. The
other is the tweak for the crystal oscillator to accommodate long term
drift there
