If you want to do duplex measurements here is what I would do. Look for an
IFR 1000S for your primary service monitor. Then look for an IFR 500.
Those things should be cheap and plentiful by now. Use the 500 as the
source and the 1000 as your calibrated receiver. Acquire some directional
(or non-directional) transmission line couplers off of ebay or
rec.radio.swap. Then measure away.
You could even get a simpler generator like an HP, dang it, forgot the
number but I think it went up to 1200 mHz or so, or a wavetek that goes to
512 mHz or something similar. Yes, it is not automatic but as I recall,
duplex testing with one service monitor was not all it was cracked up to be.
I would not suggest an HP-608 or a Model 80 unless you can afford to keep
them powered up 24/7 in a climate controlled room. Then theres the tube
budget.
Although, I seem to remember Skip's Model 80 did just fine tuning up the
receiver in my Hammerlund "Outercom" xcvr back in the 70's. Or was that the
60's? Nevermind! I learned how to tune a receiver that day, RF anyway.
Just learned about IF's last week.
BTW, if I never said it back then, thanks Skip!
td
wb6mie
From: "wb6ymh" <[EMAIL PROTECTED]>
Subject: Service monitor question (was Re: Re: Cushman CE-4)
The CE-5 has 1 Khz steps and does not do full duplex.� There are
various options on the IFRs some have tracking generators.
I've done a bit of googling for IFRs and Cushmans, but I guess they
are too old, I found very little information other than old for sale
ads.� (And one guy that had a picture of himself and his CE-50 along
with his other "family album" pictures !)
There seem to be quite a few Motorola service monitors on ebay, but
from what I remember they had a reputation for being unreliable.
I'll bet the CE-5 drifts a little less than the model 80 it's
replacing (grin).
73's Skip WB6YMH
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