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Old 31st Jan 2020, 10:08 am   #159
allan
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Join Date: Oct 2005
Location: South coast near Ringwood/Christchurch, Dorset, UK.
Posts: 230
Default Re: RCA AR88D Comms Receiver.

Congratulations.
I'll start my AR88 refurbishment next John, although none of mine look as good as yours.
If you're going to put up a long wire I recommend trying an "unun". I made one a few weeks ago and it works really well. It's an auto-transformer wound on a toroid with about 9:1 step down. The larger the toroid and the more turns of wire the better the LF performance, and adding a ground wire to a metal plate stuck in the soil adds extra performance. Lots of constructional details around and I put mine in a small plastic box. It took 30 minutes to make it. I might try a 16:1 version next for VLF.
I think I have three AR88LF and one AR88D. See if you can spot them.
http://www.radiomuseum.co.uk/plans.html
Allan G3PIY
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