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From: barron@liant.com
Subject: Re: My Spread Spectrum Letter to FCC
Date: Mon, 2 Dec 1996 15:07:58 -0600 CST
Bob,


> What bothers me at the moment is that all of the TAPR STA participants
> who have a specific experiment are listed as 900 MHz Frequency Hopping
> with one watt. This is probably inevitable, given just 6 months by the
> STA. My opinion is that there is **SO** much crud on 900 that
> interference tests on that band will be essentially meaningless.

All the more reason for weak signal ops to participate. There can be a meaningful investigation of this if the weak signal use their equipment to test whether SS signals will adversely affect their performance.

As an example. An SS transmitter is turned on and a long sequence sent (or not) every time slice. The choice of transmit or not is random and not known to the WS listener. The WS listener listens to the WS calling freq and attempts to determine when the SS transmitter is actually sending. Will the WS station be able to tell the difference? Maybe. Maybe it all depends on the antenna positioning, power, proximity, etc.

Actually one can do this type of testing without an STA just by using Part 15 devices that are available to everyone. Has anyone else ever tried this?


> What we all need is a longer-duration STA for TAPR to give them time to
> field some DS and FH gear that resembles "the future", and on other
> bands, and nearer the 100 watts that the FCC proposed. Then we could
> evaluate the effects of what the FCC proposed.

Hmmmm.... I thought it was TAPR and the ARRL which proposed this but no matter. 100 watts would be the maximum allowed with specific requirements that minimum power be used, a *real* strick requirement realistically required of no other mode. But I agree that some more testing, other than 1 watt 902 MHz modems needs to be done.

The STA can be extended by the FCC if they deem it worthwhile. So there may be some time to do just as you suggest. But I think that getting something up and running to test as soon as possible is the right solution.

I don't want to see the WS segments "ruined" but fighting the STA (especially at this point) is wasted effort. Better to take part in the investigation and really learn what all of this will mean to Amateur Radio.

73,

Robert Barron, KA5WSS barron@liant.com Liant Software Corporation Hook 'Em Horns! ------ Submissions: vhf@w6yx.stanford.edu Subscription/removal requests: vhf-request@w6yx.stanford.edu Human list administrator: vhf-approval@w6yx.stanford.edu