[HBR] 160m coils for HBR-11?

[Hopperdhh at aol.com]

Big Nick,

The Hallicrafters SX-100 and early SX-101's had a  1650 Kc 1st IF and 
covered 160 Meters.  As for the tuning capacitance being  too small, the ratio of 
Fmax to Fmin on 160 is less than on 80  meters.

Yes, you would have to watch the winding capacitance.  How  about using 
powered iron toroids so that fewer turns are needed.  I have  been tempted to 
try this with the HBR anyway.  The Q would be at least as  high as the air 
wound coils -- around 200 or so.  Hope Ted doesn't mind me  suggesting that.  
Another option may be to use universal wound  coils that could be modified 
by unwinding to the required inductance.   Possible candidates would be old 
IF transformers or BC  coils.

73,

Dan K9WEK


In a message dated 4/9/2009  11:34:04 A.M. Eastern Daylight Time, 
bignick at execpc.com  writes:


Hello
all,

I found a comment
made by Ted  Crosby in his HBR-13 QST feature:

"Often,
I’m queried  about font-end coils for the broadcast and 160-meter
bands.  Sorry, but  these are
impracticable; the range of the tuning capacity too small for the  required
frequency coverage at these relatively low frequencies.  Also,  in both 
instances the
frequencies are too close to the receiver’s  first i.f. for
trouble-free operation."

As  suspected
:-(

73

--Big Nick AKA  KC9KEP


>
I thought of winding a set, myself.... the the wire  would end up being 
> PRETTY DARNED SMALL with the capacity for enough  turns*... not to
mention 
> the possibility of interaction with the  1st. IF. 
> 
> *(it would put you quite a ways from the doorknob -  HI
HI HI ) 
>  
>
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