[HBR] modifying the 262kHz K-Tran IFs to 100kHz

[bignick at execpc.com]

AA1XV,

Excellent advice!

I should have asked the
group before I tried moving the coil!

(Actually, your method
should be posted somewhere under hints & kinks :-)

Out of
fear of destroying any more IF Xformers, I left the coils where the are
and had started wiring yesterday.

Do you suppose the over
coupling will be a problem?

Thanks again,

--Big Nick
KC9KEP


> bignick at execpc.com wrote: 
>>
Hello all, 
>> 
>> I am using the 262kHz 
>> K-Tran IFs in my HBR-11. 
>> 
>> So, I
thought I'd make the 
>> modifications suggested at: 
>> 
>> http://www.qsl.net/k5bcq/HK/HK.html#SUB 
>> 
>> Adding 430 pF mica caps was no issue, but trying
to do the 
>> following: 
>> 
>>
"heat the upper (easy access) coil until the 
>> wax melts
and slide it to the end of the coil form " 
>> 
>> turned out to be near disastrous for me :-( 
>> 
>> I used an Unger 
>> heat gun and tried to CAREFULLY
heat the wax/upper coil. 
>> 
>> As I 
>>
heated, I gently pushed on the coil with a tool in an attempt to slide 
>> it 
>> one 
>> its form. 
>>

>> There really isn't much room to slide it; 
>>
I'd guess about 1/8" at most. 
>> 
>> While I
was trying to slide 
>> the coil, I suddenly realized that the
plastic coil form 
>> was starting 
>> to bubble up
for the heat & was turning to mush! 
>> 
>> I
quickly 
>> removed the heat and tried to hold the plastic form
is the 
>> "correct" 
>> position while it
cooled. 
>> 
>> It's plenty 
>>
distorted, but if I'm lucky, it still may work. 
>> 
>> So, if anyone 
>> else tries this, be careful. Also,
let me know if you were 
>> successful. (I may just settle for
over-coupled 
>> transformers.) 
>> 
>>

>> 
>> 
>> I see that someone is selling
one of these 
>> transformers for $40 on eBay so 
>>

>> 
>> 
>> I wouldn’t want to
se any get melted 
>> J 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> Thanks and 73! 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>
--Big Nick AKA KC9KEP 
>> 
>>
http://69.65.28.126/~ehdjn2fa/temp/HBR_WEB/chassis_top.jpg 
>>

>> 
>>
______________________________________________________________ 
>> HBR mailing list 
>> Home:
http://mailman.qth.net/mailman/listinfo/hbr 
>> Help:
http://mailman.qth.net/mmfaq.htm 
>> Post:
mailto:HBR at mailman.qth.net 
>> 
>> This list hosted
by: http://www.qsl.net 
>> Please help support this email list:
http://www.qsl.net/donate.html 
>> 
>> 
> I
did not have that problem.... but it was a couple of years ago and did 
> three succesfully. just stuck my 25 watts soldering iron at each
end and 
> gently pushed the coils toward the ends. It took a few
seconds and the 
> forms were NOT deformed. 
> 
>
I have eight that I might use on a second HBR but if I change my mind, 
> I'll give a chance to the group first and if there is no interest,
will 
> offer them on the auction place. 
> 
> 73,

> AA1XV 
> 
>
______________________________________________________________ 
>
HBR mailing list 
> Home:
http://mailman.qth.net/mailman/listinfo/hbr 
> Help:
http://mailman.qth.net/mmfaq.htm 
> Post:
mailto:HBR at mailman.qth.net 
> 
> This list hosted by:
http://www.qsl.net 
> Please help support this email list:
http://www.qsl.net/donate.html 
>