[HBR] 160m coils for HBR-11?

[bignick at execpc.com]

Hmm .. Good food for thought!

I can wind universal coils: 
http://www.youtube.com/watch?v=FIOocMoRsYQ

As a mater of fact, I made my own BFO tapped coil with my coil
winder for my HBR-11.

I may just try this regardless of what
Ted said :-)

--KC9KEP

> 
> 
> 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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