Re: Direct Connection between FSL and PL 360?

Gary DeBock

On Tue, Jul 6, 2021 at 07:16 PM, Steve Ratzlaff wrote:

Well, I'm afraid without some real unsoldering work which would leave the FSL unusable, your idea won't work. The Pl360/365/SSB etc. all use the SiLabs DSP chip which tunes the antenna inductance (which plugs into the radio in this radio's unique case). The antenna inductance has to be in the correct range to tune the AMBC band. The FSL's tuning cap has to be disconnected.

Plus the Pl360 et al have a small approx. 1" ferrite rod loopstick inside the radio which is always in the circuit and which can interact with the plug in antenna.


All of Steve's comments on the PL-360 have been experimentally verified. The PL-360 stock loopstick is the deafest antenna in Ultralight history, but it does have one nice redeeming factor-- it is easily unplugged and discarded. But as Steve says, an even worse internal antenna stays in the PL-360 circuit even when you do this.

Back a few years I designed 7.5 inch (19cm) Longwave and Medium Wave plug-in loopsticks for the PL-360, which worked like gangbusters and were ordered by 25 hobbyists. The big advantage of these enhanced loopsticks is that no radio "surgery" on the PL-360 is required. These loopsticks will work equally well with all the new SSB variants of the PL-360, and the related technical article is posted at

Gary DeBock (in Puyallup, WA, USA)


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