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
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----- Original Message -----
From: "Ashhar Farhan" <farhan@...>
To: <BITX20@...>
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
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