[TenTec] Chirp, Chirp, Chirp, Spike, Spike, Spike

[kkanalz@optelinc.com]

I'll bet you a buck that the "spike" is caused by the microphone
element picking up the mechanical switching NOISE from your
push-to-talk switch... when this gets passed on to the audio pre-
amp and subsequent stages, it can generate an output power
"spike".  Try keying the PTT circuitry without a microphone
connected, Reid  (e.g., remove the mike from the front panel
connector and use a little jumper lead from the PTT pin to ground
on the microphone socket), while observing your "output spike".

Karl K. - W8TIF
McKinney, Texas





"Simmons, Reid W" <reid.w.simmons@intel.com> on 01/08/99 12:58:00 PM

To:   tentec@contesting.com
cc:    (bcc: Karl Kanalz/hdq/Optel)

Subject:  [TenTec] Chirp, Chirp, Chirp, Spike, Spike, Spike





Chirp, Chirp, Chirp.  It sounds like Spring is here!

My Omni VI/3 does not have the CW chirp problem as far as I know,  but
there is a SIZABLE spike (80 - 100 watts on a power meter) emitted on
LSB when the when the PTT is activated.  I have traced it as far as the
Low Level RF board but still haven't determined exactly what is
generating it.  Any ideas?

Thanks.

Reid, K7YX


______________________________ Reply Separator
_________________________________
Subject: Re: [TenTec] One, final, final chirp
Author:  "Dr. Gerald N. Johnson; P.E." [SMTP:geraldj@ames.net] at MSXGATE
Date:    1/8/99 9:25 AM


Clicks will be most perceptible in the wide receiver IF filter, least
perceptible in the narrow IF filter. The details of a particular
filter's frequency AND time response will determine what part of a click
it passes. That may vary from unit to unit depending on manufacturing
tolerances.

W1AW on 14.0475 has a leading edge click.

Chirps are narrow band events and should sound the same on narrow or
wide filters.

W1AW has NO chirp on 14.0475.

73, Jerry, K0CQ

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