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

[Hugo W. Catta]

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
>
>
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>   
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