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Author Topic: Coil in PJ-80  (Read 97 times)

ON4CKM

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Coil in PJ-80
« on: December 22, 2019, 09:55:02 AM »

I'm building the PJ-80 ARDF receiver kit. It is very similar to the R3500D.

There are two shielded coils inside. I found that T2 is broken inside. One of the coil sides has infinite resistance. I'm looking for a replacement, but there is not much to be found on the specs of this shielded coil. It is a Toko style shielded cap. It has a white cap and the number 1057 on the side. Full installation manual can be found on http://crkits.com/pj80kitbuilding.pdf.

The other one (black capped, 1056 printed on it) seems to be OK.

Any help on identifying the part and finding a source where it can be bought is very welcome.

73, Cedric ON4CKM
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W9IQ

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Re: Coil in PJ-80
« Reply #1 on: December 22, 2019, 11:31:58 AM »

I would think an email to Adam Rong rongxh@gmail.com would get you the answer or a replacement part.

- Glenn W9IQ
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

W1VT

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Re: Coil in PJ-80
« Reply #2 on: December 22, 2019, 04:10:44 PM »

It may be possible to carefully unwind the broken coil and replace it with new wire.  Count the number of turns as you unwind it.
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WB6BYU

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Re: Coil in PJ-80
« Reply #3 on: December 22, 2019, 04:26:31 PM »

Before unwinding it, I'd remove the cover and see if one of the wires didn't
get soldered properly to the pin.  With thecthin enameled wire used in such
transformers, it isn't uncommon for the insulation not to get removed
properly to make a good joint.  A good magnifier will help.

If you need to rewind it, make a careful count of the turns, as one side of
T2 is the VFO coil, and the value will affect the tuning range.  Hopefully
the break is in the output link side and doesn't require removing the
other winding.
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