[HBR] 160 Meter Coils

[Hopperdhh at aol.com]

Tom (and all),

I downloaded Hallicrafters "sx101mk2" from BAMA.  It does have 160M with a 
1650 Kc 1st IF.  I didn't see any traps, etc.  That tells me that the IF 
feedthrough issue shouldn't keep us from making coils for 160.  Maybe it isn't 
perfect -- like 60 or 80 db down, but its definitely worth going for.

Dan K9WEK


In a message dated 12/26/2006 11:16:03 PM Eastern Standard Time, 
Hopperdhh at aol.com writes:
Tom,

I never tried 160 back in the '60s because of Loran.  The pulse noise was 
terrible.  Also, we were only allowed, I think 25 Kc or maybe two places in 
the 
band of that bandwidth.  And then there was the antenna problem, and the fact 
that most factory gear didn't have 160.  I don't know which was my biggest 
obstacle!

Do you have 100 KHz for the 2nd IF?  That is, are we talking about 1610 KHz 
for the first IF?

Yeah, 69 turns takes about 23 feet of wire.  I used a coil winder with a 
turns counter on it.  It is something I made years ago when I used to wind 
small 
transformers.  You crank it with your right hand and feed the wire with your 
left hand.  The arm mechanically increments a Veeder-Root counter every turn. 
 
The pawl of the counter also keeps the arm from turning backwards, which 
helps 
to hold it when you need a break or get to the end.  For the test coil, I 
just 
taped the ends so I didn't have to drill holes in the form and ruin it.

I believe the Hallicrafters SX-101 (not the -A) had 160 M, and a 1650 KHz 1st 
IF.  If its on BAMA, I'll look at the schematic and see if this is the case.

Maybe we can work each other on SKN.  I'll be the guy with the bad fist since 
I only work CW about once a year!

Dan K9WEK


In a message dated 12/26/2006 10:41:32 PM Eastern Standard Time, 
daileyservices at qwest.net writes:
Xtal is 1710, and the main-tuning cap is a Miller 1461-BS, alright.

---yeah, conspicuous, is the fact that in MY material, there is never
anyting mentioned about the 160m band... then again, I recall that around
those times, hams were "moving up" into the higher bands, and 160m took a
real tumble in popularity.  My old boss at Burstein-Applebee in KC (WØOSD
SK) used to go on-and-on about how great the cycle in 1959 was, and I recall
that 1964 (I was a US Navy Radioman 2nd. Class at the time) was a pretty
darned good year for HF props, so the 160m band, most likely might just have
been back-burner... thus the lack of interest.

Of course, then there's the obvious - Close to the 1st. IF; Lots of wire to
get in a small space; hard to run all that wire out off your doorknob, and
still keep it straight... all that stuff.

TOm
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