[Elecraft] New transmit monitor

[Dave Olean]

I adjusted my equalizer along the same lines except I used a 2nd K3 with P3 
panadaptor.  I tweaked it until I saw a nice flat audio response across the 
entire SSB bandwidth. I was using a David Clark headset with an electret mic 
element. As soon as I did that I started getting almost 100% positve remarks 
on the audio without even asking the other station how it sounded. Most 
signals I hear seem to have a bass peak and the high end is usually down 
many dB. It helps if you turn on averaging as just one pass of a few words 
can give a misleading result. I guess the best way is to insert an audio 
oscillator signal into the mic and adjust as you sweep up in frequency.

Dave K1WHS


----- Original Message ----- 
From: "Harry Yingst via Elecraft" <elecraft at mailman.qth.net>
To: <n1al at sonic.net>; <elecraft at mailman.qth.net>
Sent: Tuesday, May 19, 2015 11:13 PM
Subject: Re: [Elecraft] New transmit monitor


>
> Any way to get that a menu option that we can turn on and off as desired?
>
>
>
>      From: Alan <n1al at sonic.net>
> To: elecraft at mailman.qth.net
> Sent: Tuesday, May 19, 2015 5:37 PM
> Subject: Re: [Elecraft] New transmit monitor
>
> The signal that the P3 receives when the K3 is in transmit mode is due
> to random leakage of the transmit IF signal out the K3's IF OUT
> connector. One reason I haven't implemented this as a standard feature
> is that it might not be reliable. If you happen to have a K3 with
> better isolation than most, there may not be enough IF leakage to be
> usable. (I didn't want to volunteer to take the customer service calls. 
> :=)
>
> Another reason is that you can't use it to measure signal quality
> anyway. It just displays the IF signal before up-conversion and
> amplification, so most signal defects don't show up.
>
> The one thing it is useful for is to adjust the transmit equalizer. I
> did this on my own K3 to reduce the bass and enhance the treble to get a
> more-or-less flat frequency response with my voice and mic.
>
> If you want to do that, just temporarily disconnect the RS-232 cable
> between the K3 and P3. That way the P3 doesn't know when the K3 is
> transmitting and so it continues to display the spectrum. Since
> adjusting the equalizer is generally a one-time "set and forget"
> procedure, I figured it is not too inconvenient to have to unhook the
> RS-232.
>
> Alan N1AL
>
>
>
>
>
> On 05/19/2015 08:04 AM, giw at bellsouth.net wrote:
>> After waiting for 4 years, I was very disappointed that the new
>> monitor in addition to the RF views did not provide a way to look at
>> the transmit audio in the pass band in the same manner as it does
>> for received SSB audio. All of the newer Icom Rigs have this
>> capability.
>>
>> On numerous occasions I have briefly seen my own audio show up during
>> transmit but as soon as speech is paused, the P3 reverts to receive
>> and on transmit the scope freezes. I have been told this occurs when
>> a pin on the RS232 makes and intermittent poor connection. The same
>> thing can be forced by pulling the RS 232 input to the P3. I am also
>> told that this ability is the result of a “stray” pickup. In my case
>> the strength of the stray pickup, when it occurs, has always been
>> enough to provide a good view of my audio if I am running 100 watts.
>> By making some pick up changes the strength of this stray signal
>> could be increased or amplified.
>>
>> It would seem very possible to have a menu selection that would allow
>> the P3 to break the connection upon transmit to allow you to use the
>> display to set up your own audio and to see what is happening at the
>> audio level. The P3 now shifts back and forth from receive to
>> transmit and instead of freezing the display during transmit, in a
>> new mode it would allow your own audio to display in the pass band
>> instead of the new SSB view.
>>
>> It might even be done on a manual basis by having an RS 232 adapter
>> in the line that would have a manual switch connected that would open
>> and close the line. This would only be used when working with your
>> own audio. In this case the new modes would have to be turned off to
>> take the P3 back to where it is now.
>>
>> Any one else have any interest in the above or any experience in this
>> area??? Wayne, Eric or Al any comment please.
>> ______________________________________________________________
>
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