From: "Gerry" 
Subject: RE: [drakelist] 2-NB coil value?


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It looks like about 1.8mH would resonate with the 68pf cap across the =
coil
but I think even an RF choke will work in this circuit. I breadboarded a
similar circuit way back when and didn't have the excact coil needed =
however
I found a 455kHz IF transformer with a tapped primary and used it. Just
leave the secondary open. The circuit was very similar in operation to =
the
R-4B noise blanker except the 2-C version was all solid-state. Effective =
on
pulse type interference.

=20

-----Original Message-----
From: owner-drakelist{at}www.zerobeat.net
[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of KS7J
Sent: Saturday, January 24, 2004 11:24 AM
To: drakelist{at}www.zerobeat.net
Subject: [drakelist] 2-NB coil value?

=20

I've managed to locate original parts for making my own 2-NB, except I =
don't
know the value of the tuned coil, T1, it doesn't show that in the =
schematic
that I d/l.=20

=20

Anyone have a manual with a parts list?=20

Any leads as to where I could find an approximate original replacement?

Also, are those 4-pin plugs still available somewhere?=20

=20

Tnx!

=20

- Casey, KS7J


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It looks like about 1.8mH would =
resonate
with the 68pf cap across the coil but I think even an RF choke will work =
in
this circuit. I breadboarded a similar circuit way back when and =
didn’t
have the excact coil needed however I found a 455kHz IF transformer with =
a
tapped primary and used it. Just leave the secondary open. The circuit =
was very
similar in operation to the R-4B noise blanker except the 2-C version =
was all
solid-state. Effective on pulse type
interference.

 

-----Original =
Message-----
From:
owner-drakelist{at}www.zerobeat.net =
[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of KS7J
Sent: Saturday,
January =
24, 2004
11:24 AM
To: =
drakelist{at}www.zerobeat.net
Subject: [drakelist]
2-NB =
coil
value?

 

---