[1000mp] Clicks/Thumps Follow-up

[Dean Fewkes]

John,

This is very normal for the Field model, and I cured mine. Here is a copy of 
an earlier post I made that will be helpful:


 My Field had both clicks and thumps in the headphones when operating CW 
from the time it was new. I played with the menu settings, but all that did 
was mask it a little.

The thumps can be described as a very low frequency thump (below 50 Htz) 
that is heard with every transmitted dit regardless of whether you are 
working full QSK or semi. The problem is noticed because most headphones 
have strong reproduction of these very low audio frequencies. I solved the 
thumps shortly after getting the radio by installing a 2.2uf electrolytic 
capacitor in line next to each headphone speaker.

This also had a very slight effect on the full bodied sound that the Mark V 
produces on SSB so I installed micro switches to bypass the capacitors when 
listing to wide SSB. The switches fit nicely into my Heil Pro headset. I 
used the switches because I have always been amazed with the beautiful warm 
sound that the Mark V produces on SSB and I did not want to reduce this in 
any way.

The clicks can be described as a broader spectrum click that occurs during 
full QSK or only when the radio switches from tx to rx during semi qsk. This 
is usually heard when the volume is turned up because signals are faint. On 
my radio, it was more evident with certain combinations of filters too. I 
used to minimize these clicks by keeping the rf gain high, and the volume 
low. When I recently installed the roofing filter, inrad key click mod and 
some new 2.8 Khz IF filters all at the same time, the clicks totally went 
away. I think they were cured by either the roofing filter, key click mod, 
or both. Now there is no trace of the clicks in the headphones even if I try 
to hear them.

Wow, it sure is nice to have smooth QSK again, it sounds like a symphony.

Dean Fewkes
KG7MZ








----- Original Message ----- 
From: "John Rippey" <w3uls at 3n.net>
To: <1000mp at mailman.qth.net>
Sent: Friday, May 06, 2005 1:25 PM
Subject: [1000mp] Clicks/Thumps Follow-up


> Thanks for the replies.
>
> I do not find a difference with EDSP off or on. Nor with the Monitor off 
> or on. Oddly, I do find a difference when using the 2.4 kHz filters 
> (Normal) vs. the Yaesu/INRAD 500/500 Hz filters I have installed (Narrow 
> 1). The latter make the clicks/thumps much noisier, and I use them most of 
> the time. On Normal, the problem is almost gone.
>
> I may send it back to Yaesu to see what if anything they can do.
>
> 73,
> John, W3ULS
>
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