Last night I used the NC-156 receiver, with its 1500 KHz IF, on the Gray
Hair Net on 1945 KHz. With the 1500 KHz filter (parallel-resonant 1000pF
and 11.25µH) in series with the antenna lead, the 1945 KHz AM signals
were strapping with only a very faint beat note which varied in pitch as I
tuned
Just a little tidbit of an interesting story, at least for me, HIHI
On a similar incident of BC interference:
Back when I was about 18 yrs old, I was experiencing AM radio interferences
from two stations at the same time. Now this was a long time ago so some of
the details here may be incorrect
Last night I had a chance to play some more with this.
Perusing the junquebox yielded a 3-section, 400pF/section broadcast band
air variable and a piece of air-wound coil stock about 2 diameter and
about 2.5 long, #16 tinned wire, with spacing between turns about equal
to the wire diameter. The
Larry:
Let me jump in on that trap thing for just a
moment.
You are trying to reject what frequency / frequencies?
And you want to pass what frequency / frequencies?
Reading your last mail here leaves me confused as to
what you wanted to do. I thought you wanted to
reject 1500 or so and
- nothing to write home about, and
hardly optimized, but good enough considering the time and effort I care
to invest in this particular project.
73/TNX,
-Larry/NE1S
- Original Message -
From: Jim Tonne [EMAIL PROTECTED]
Sent: Mon, August 11, 2008 13:33
Subject:Re: [AMRadio] 1500 KHz trap for NC
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Szendrei
Sent: Monday, August 11, 2008 12:54 PM
To: Jim Tonne; Discussion of AM Radio in the Amateur Service; Glowbugs
Subject: Re: [AMRadio] 1500 KHz trap for NC-156
Hi Jim,
Apologies if my post was confusing.
Yes, I'm attempting to reject 1500
Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Szendrei
Sent: Friday, August 08, 2008 7:09 PM
To: Glowbugs; AM Reflector
Subject: [AMRadio] 1500 KHz trap for NC-156
Hello all,
I'm working on putting an AM station together for a friend, consisting
of a Viking II and NC
-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Larry Szendrei
Sent: Friday, August 08, 2008 7:09 PM
To: Glowbugs; AM Reflector
Subject: [AMRadio] 1500 KHz trap for NC-156
However, the IF in the NC-156 is 1500 KHz, and as you might expect there
is bleed-through of broadcast
Gents:
I just called on my favorite filter design program Elsie
and came to the conclusion that going clear down to
about 3 uH (resonated with 3000 pF) would be
advisable in a 50 ohm system. The two items would
be connected in parallel to form a trap, and that trap
would be placed in series
Thanks to all that responded, still digesting the all the great
information.
Not much radio time left to play this weekend, but will try to play with
it some more during the week after work, and when I get something
working to my satisfaction, I'll report back.
Much appreciated.
73,
Hello all,
I'm working on putting an AM station together for a friend, consisting
of a Viking II and NC-156, both quite cosmetically-challenged, but
complete.
I did a bunch of work to bring them back to operation, including
significant audio improvements in the Viking.
However, the IF in
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