[INRAD] POP in rx on cw

[Dean St.Hill]

Hi Perry


Could you give a little more information:

Do these pops occur when you're in vox, QSK and are you using the built-in 
keyer, external keyer or hand key??

It may not seem to be critical, but here's an example from www.va3cr.net 
that shows how critical it is to properly assess the problem...

Clicks and Thumps in Headphones on Mark V (W3ULS)

Problem: Since taking possession of a Mark V last year, I have been very 
disappointed in the clicks and thumps I was hearing while transmitting CW. 
No amount of tweaking of menu settings as discussed in previous postings 
seemed to help.

Solution: On Saturday I pulled the Mark V for first echelon maintenance and 
in vacuuming the rig in some good light I noticed that the tiny blue slide 
switch recessed in the back panel that controls the linear amplifier relay 
was "on." The manual states that the switch comes disabled "to avoid the 
clicking sound when the transceiver is used alone. . ." Oh, my. Apparently 
the previous owner (I bought the Mark V from a ham in Florida) had used a 
non-QSK linear. It had never occurred to me to check the relay switch since 
I run the Mark V barefoot. So on Saturday, I switched it off.

Lo and behold, once back on the air, I discovered the clicks and thumps in 
my headphones were gone. Using Hi-Fi phones does give me a vestigial 
"thump," but with a set of phones with less bass response there now is 
nothing but a pure CW tone to hear. What a difference!

With regard to the "MONITOR" button, the manual says the monitor circuit is 
always on when sending CW, so I guess the only advantage of pressing the 
button is to be able to adjust the sidetone volume via the monitor's volume 
control. I don't use it.

Bottom line: anyone hearing objectionable clicks and thumps in his/her 
headphones with a Mark V needs to make sure the linear amp relay is switched 
off. Don't do as I did and assume it's off.
73,
John, W3ULS


HOPE THAT MAY HELP IN PINNING DOWN THE PROBLEM!!!


Best regards,


Dean - 8P6SH





-----Original Message-----
From: PERRY BAKER <thkpqb at yahoo.com>
To: INRAD FILTER <list at inrad.net>
Date: Mon, 16 Jan 2006 12:37:37 -0800 (PST)
Subject: [INRAD] POP in rx on cw

> Hello 
> 
>   I have an FT1000mp field 
> I have the inrad 703c filter in narl spot  along
> with the stock 500 filter in the 8.2 if 
> 
>   when transmitting  cw  and goes back to rx  I
> get a pot in the receiver.
>   If I take the 703c filter out and put in any
> other filters ( I have a 714c  and the stock 
> collins 500  I dont get this to happen 
> 
>  and   If  I  put the 703c  in the subreceiver 
> it  seems ok also
> 
>   of if I Put it in the 250 hz slot  it seems  ok
> 
> 
> 
> Only when its in the  Nar1 slot  do I get a pop 
> or thump when the rx comes back on 
> 
> anyone have any Ideas ?
> 
> Perry WA8THK
> 
> 
> 
> Perry   WA8THK 
> Gaines Michigan
> 
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