Hi!
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To be safe, a layer of plumbers PTFE tape on balun before winding the coils is helpful.
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73
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Rahul VU3WJM
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Steve Hartley wrote:
Ashhar and freinds
I have solved my balun core problem. As you guessed, it was caused by sharpe
edges inside the core. I small file and emery paper removed them and
windings now well isolated from core.
For UK builders, Robin at Sycom (sycomcomp.co.uk) stocks the cores - part
number FX2754 about 50p each, I think.
Now, on with the Tx.
73, Steve, G0FUW
----- Original Message -----
From: "Ashhar Farhan"
To:
Sent: Friday, July 08, 2005 6:14 AM
Subject: Re: [BITX20] BALUN Core Winding
>
> the problem with balun is that it has a sharp edges. these edges nick the
> enamelled wire being passed around. and the wire gets scrapped and touches
> the core. if more than two wires get nicked, they short, showing high
> resistance like you said.
>
>
you need to be careful in not pulling the wire too tighly around the
> edges of the balun. a better way might be to coat the corners with a bit
> of paint.
>
> - farhan
>
> On Thu, 7 Jul 2005, g0fuw wrote:
>
> > Guys
> > I am building a BITX and have the rx working very nice.
> > However, there is a problem of microphics around the detector/af amp.
> > Ceramics replaced, as per past postings. No change.
> > I have now traced this to the balun core and find I have a 'short' of
> > about 60k between one of the windings and the core.
> > I have tried different wire and smoothing the holes before winding but
> > every time I get a 'short'.
> > I have tried a toroid core and that works without the problem.
> > Interested to know if anyone else has experienced this and if they
> > found a fix!
> > 73, Steve, G0FUW
> >
>
>
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
> Yahoo! Groups Links
>
>
>
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>
>
>
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