hello ,to have a few informations about your
NM-12AT,just ask google..you will find a pdf with pictures
,accessories,specifications...it seems yours has a problem,if you cannot
find the problem and repair it,you can maybe increase the sensibility by
adding before the receiver a preamplifier ,in your case maybe a low nf
operational amplifier ,Maxim and AD make execellent.Your receiver will not
be repaired but can be more useful.

I found nothing for the nm52
best regards
73 alain F1gqb


--
Alain Nierveze
www.radio-astronomie.com

"Scott Dorsey" a écrit dans le message de news:
...
nierveze wrote:
hello,thanks for your answer,I also have a nm67 and a nm57,all working
well,no documentation of course!!!

I have an NM-12AT! I never did succeed in getting manuals for mine.

they are very useful to measure gain or nf of preamplifiers,or simply as
receivers.I have been using the nm57 on 137 mhz during lots of years to
get
pictures from wheather sats.

That is pretty sensitive. The NM-12AT is not sensitive enough to get
the local airport beacon, although it will detect a signal from my
signal generator. I do not understand the calibration and meaurement
procedure and my suspicion is that the front end is damaged because the
sensitivity is so poor.

Is the anyone that has some information:sensitivity,nf,frequency and
bandwith if the if,and some other things.???

No, I wish I did!
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."