[1000mp] Yaesu Mark V & FL-2100 Series

[Rob Atkinson]

I hope this isn't a red herring:  I had a problem with a spike on PTT 
make with my ten tec omni VI when I first got it.  there was also a 
smaller one on break.  this was ssb only, not when keying for cw.  in 
this case it wasn't as big--around 75 w. on make and maybe 35 on break. 
   for awhile, i didn't even notice it because i didn't have anything 
fast enough and sensitive enough to catch it, and it wasn't enough to 
harm anything downstream fortunately.  about a year after i got it, i 
opened it up and went to the board with the bal. modulator and tweaked 
two trim pots that are adjusted to get a carrier null.   after getting 
a better null, i put the rig back in service and noticed the spike was 
gone.  i never noticed it with vox, but also with vox, to key the rig I 
had to give the rig some sound resulting in output anyway on make, so 
that may have disguised the spike.

rob/k5uj


On Monday, October 17, 2005, at 09:25 AM, Mike Schatzberg wrote:

> Hello Ed:
>
> Perhaps the relay timing on my QSK amplifiers is different then in your
> amplifier, meaning the input relay does not close until after the 
> output is
> closed.  This delay may eliminate the inputting of the spike to the 
> amp, and
> cause me not to see the spike in the amplifier output.
>
> I have seen the spikes with PTT, which I associated with something in 
> the
> mic preamp circuit, as the spikes were not present with MOX operation. 
>  I
> thought they may be caused by some internal mechanical noise in my MD 
> 200
> push to talk switching.  I do not see spikes with VOX operation either,
> which is my main mode of operation. If you decrease the mic gain and
> processor gain, do the spikes still persist?
>
> Thanks for your input.
>
> 73,
>
> Mike
> WB2AJI
>
>
> ----- Original Message -----
> From: "Ed McNamee" <gopone at ptd.net>
> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
> Sent: Monday, October 17, 2005 9:58 AM
> Subject: Re: [1000mp] Yaesu Mark V & FL-2100 Series
>
>
>> PTT or MOX makes no difference.  Reducing the output to 75w does not
>> eliminate the full power spike.
>>
>> As I stated I spoke to Yaesu about this problem.  They had no 
>> response or
>> fix, at least not for me.
>>
>> Put the Mark V on a scope and you will see the spike.  Very fast but 
>> there
>> all the same.
>>
>> As I also stated this was the topic on this reflector some while back.
>>
>>
>> Ed
>> W3EJM
>>
>>
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