[EMAIL PROTECTED] made an utterance to the drakelist gang
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Not to mention, the SP-75 is a desirable piece of equipment. You may
also want to consider fixing it and selling it. I have one and love it.
Joe, N9JCQ
-----Original Message-----
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thu, 4 Oct 2007 1:29 pm
Subject: Re: [drakelist] SP-75 Speech Processor
DW,
Well, this is a multipart question but let me try to be brief. There
are several types of speech processors and the SP-75 is illustrative of
a compression type, not a clipper, etc. The speech processor basically
raises the amplitude of the lower amplitude speech components while not
allowing the higher amplitude ones to go much higher. This results in
an increase in talk power. It improves intelligibility and there is no
splatter, assuming only a certain amount of compression is used (how
many db varies from rig to rig). In other words intelligibility is
increased under difficult band conditions. Your average power goes up
so if you use a linear, you are significantly increasing the duty
cycle. For some "marginal" amps, you may have to limit the input power
since their power supplies, cooling, etc. might not be able to handle
the increased duty cycle.
When you take a look at the specs for a linear, look at the CW and AM
capabilities with respect to SSB. Many legal limit (for SSB) amps
can't do legal limit in all modes (incl. AM and CW).
73,
Evan, K9SQG
-----Original Message-----
From: DW Holtman <[EMAIL PROTECTED]>
To: drakelist <[EMAIL PROTECTED]>
Sent: Thu, 4 Oct 2007 1:11 pm
Subject: [drakelist] SP-75 Speech Processor
Hello,
Will a SP-75 Speech Processor really improve my signal, so in
situations where I'm barely heard, my signal will be easier to copy?
How does it do this? Dosen't increasing the audio cause splatter? Why
didn't the original manufactures use the most optimal audio modulation?
I'm completely ignorant on the use of speech processors. I have a SP-75
that does not work, and was wondering if spending the time to fix it,
would be time well spent.
Thank you in advance.
Best,
DW Holtman
WB7SSN
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