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Author Topic: 10 meter fm  (Read 359 times)
KC9AZL
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Posts: 250




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« on: March 04, 2002, 06:02:50 PM »

Is there a way to convert ssb to fm?  Is there a way to add pl to a HF rig?
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K0CBA
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Posts: 299




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« Reply #1 on: March 04, 2002, 08:58:12 PM »

For all practical purposes, no.  They are completely different critters using different approaches to signal generation and reception.   Even if you could do it, you'd have more tied up in parts, circuits and labor than you would buying a seperate rig AND you would be on 10 FM years sooner.  There is/was an outfit called Comspec that made CTCSS encoder/decoder units that can be wired in to almost any rig.
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K5DVW
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Posts: 2193




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« Reply #2 on: March 05, 2002, 09:14:33 AM »

If you unbalanced the balanced modulator, added a varactor and modulation circuit for driving it to the main VCO, and redesigned the VCO control loop parameters, then yes. But I doubt you'd want to do that. You'd have to also design a FM demodulator and somehow wire it into your radio's IF for reception. Unless you were patient, had access to a lot of test equipment, and really knew your way around your radio circuitry, it wouldn't be advisable.

K5DVW
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WB2WIK
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Posts: 20595




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« Reply #3 on: March 05, 2002, 03:14:01 PM »

There is no practical way to do this.

However, adding "PL" to an HF rig is quite easy.  Most modern, fully-featured HF rigs do include the FM mode, and memories, and also include CTCSS, or "PL."  Those that don't include PL standard, have a tone board as an option.

If you have an older rig, or one that is not "full featured," adding a PL board can still be accomplished.  The easiest way is to simply buy a postage-stamp-sized tone board from Communications Specialists Inc. <http://www.com-spec.com>  Those come with complete wiring information on installation in just about any kind of equipment.

But, if your rig doesn't work FM at all, the tone board (PL generator) won't do much good.

WB2WIK/6

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