Dirty power supply connections can happen to every user. Perhaps a
regular cleaning interval is indicated, something like every year or
two. Accompanied by a drop of DeoxIT on the contact surfaces to clean
and delay the need for future cleaning.
Chirp from the voltage change at key closure might hint at a need for
better voltage regulation of some oscillator, perhaps with a voltage
regulator chip needing less head room than the LM34x or 78x families.
Though that much voltage drop probably also leads to a serious loss in
output power.
73, Jerry, K0CQ
On 5/14/2010 1:43 PM, dtx@verizon.net wrote:
I have occasionally had a chirp report from my 0-IV, invariably caused
by a dirty power supply connector and cured by a proper cleaning. The
scope pattern of its keying has been decent from the start - did take
the time a few years ago to measure the rise and fall times - forget the
numbers but since were in the range of above too sharp and below too
soft at 35 wpm didn't bother to record. K3TX.
On May 14, 2010, *Dr. Gerald N. Johnson* <geraldj@weather.net> wrote:
There are also complaints of a chirp from the Omni VI. Typically heard
only by other Omni VI users. It is a fact that the BFO crystal is
shifted at key closure from receive to transmit. So it is heard at the
other end of the connection and passes through the SSB filter. I
suspect
the "click" and chirp are increased by the phase response at the
edge of
the filter pass band and increased more by the edge of the filter pass
band in the receiver that's detecting the signal. I know I've listened
to a supposed clicky and chirpy transmitter (Omni VI at W1AW on 20
meters) and found no hints of either click or chirp using a tentec or
other receiver even when I tuned to a very low pitch which makes chirps
more pronounced.
This topic has not been on this forum for a year or two, maybe three.
But there should be extensive discussions in the archives.
Fact is, you need a rapid rise which leads to a hard signal when you
run
CW above 15 wpm, faster if you run 40 or 50 wpm. Else the bits of
characters run together and get hard to copy. That also happens with
narrow CW filters from other vendors, it was noticable with a 400 Hz
filter in a Kenwood at speeds of only 25 to 30 wpm.
There are thousands and thousands of happy Omni VI CW operators happily
working rag chews, traffic, and DX without click or chirp complaints. I
don't have one simply because I prefer USB for CW, especially on VHF
with a transverter where USB is the standard voice mode and mixed mode
contacts are common.
73, Jerry, K0CQ
On 5/14/2010 8:29 AM, Roger Rippy wrote:
> "As you may know, most TT rigs up to the Orion series, have
fairly hard keying, and we have occasionally got comments about
"sounds a bit clicky".
>
> What is the consensus of the Omni VI operators? Do you routinely
receive these comments from others? I have not received a comment
about hard keying or clicking from my Triton IV, but then it is
quite a bit older than the Omni VI.
>
> Just curious since I am considering buying an Omni. Thanks, Rip
> Roger Rippy W7RIP Bozeman, Montana
>
>
>
>
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>
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