[Elecraft] Audio problem in WPX SSB

[Joe Subich, W4TV]

>   With the K3, the messages play fine, but after one 
> finishes, if I use the mic, the radio starts out at lower 
> power and takes 2-4 seconds to build back up to high power. 
> This is the same whether using the front or rear input 
> and whether using high or low gain. 

I've noticed the very same thing with the microHAM microKEYER II 
and its software DVK.  I have not had time to further diagnose 
the issue and check it with other interfaces but it is quite 
pronounced. 

There is no difference if using FP.L or FP.H when the MK II 
output is adjusted for four to five bars of ALC.  Bias is OFF 
and the microphone output of microKEYER II is capacitive 
coupled (top and bottom) so there is no "DC effect."  

I will not have time to look at this issue further until later 
in the week. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Andy Faber
> Sent: Monday, April 07, 2008 12:08 AM
> To: nextk at elecraft.com; wayne burdick
> Cc: elecraft at mailman.qth.net
> Subject: [Elecraft] Audio problem in WPX SSB
> 
> 
> Wayne,
>   A peculiar audio situation arose using my K3 in Aruba in 
> WPX SSB.  It 
> works the same way at home, and isn't a problem I've ever had 
> with any of 
> many other radios that I've used in the same contest configuration.
> 
>   Here is what happens:  For phone contesting, I my software 
> CQPWIN, which 
> plays wav files for DVK usage (as do other programs).  I run 
> the output in 
> such a way that when the dvk is playing, the mic is shut off, 
> but the audio 
> from the computer goes into the mic connector of the radio.  
> As soon as it 
> stops playing, it disconnects the computer and reconnects the 
> microphone. 
> I run it from the computer into a W2IHY iBox for isolation, 
> and the output 
> to the radio.  The Mic is a Heil pro-set.
> 
>   With the K3, the messages play fine, but after one 
> finishes, if I use the 
> mic, the radio starts out at lower power and takes 2-4 
> seconds to build back 
> up to high power.  This is the same whether using the front 
> or rear input 
> and whether using high or low gain. Also, the W2IHY box has 
> to be turned up 
> to a level that normally would overdrive other radios.
> 
>   I tried not using the W2IHY box (ie, running the audio 
> straight from 
> either my laptop or my desktop to the radio) with the same 
> result.  It also 
> doesn't matter if the radio is using PTT or VOX, or whether 
> it just remains 
> in transmit.
> 
>   These seems like a some kind of odd impedance issue, but, 
> as I said, it's 
> one that has never shown up with Icom-Yaesu or Kenwood radios.
> 
>   Any ideas?  I'm using 1.78/1.58 firmware, and the radio was 
> just back to 
> you for Rene to do hardware mods (serial number 76).  In all 
> other respects, 
> I loved it in the contest.
> 
>   73, Andy, AE6Y 
> 
> 
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