K2 KSB2 SSB Adapter - Holding [VOX] 1 second locks up at SPCH 0.2, Low SSB out?

[Tom6]

((I have K2 s/n 06660 with: KAT100-1, KDSP2, KNB2-R, KPA100-R,  KSB2-R, KUSB.
Completed assembly of all and installed all modules. Confirmed  power output
on all bands per K2 and KPA100 procedures.))
 
Two problems:
 
1) Holding [VOX] 1 sec to select between normal PTT, SPCH 0.2, SPCH  0.4, or
SPCH 1.0 doesn't work. First push and hold locks up in SPCH 0.2 mode and  
further pushes do nothing - "L" is flashing, cannot cancel. Only way to cancel  is
to power down and back up.
 
2) Although power output confirmed on all bands and various power  levels (5,
10, 20, 50, 100 W), I do not seem to get full power on SSB with hand  mic (I
suppose that makes sense with SSB, no carrier, if no sound into mic then  no
output?) but I see no variation in power if I speak into mic - Observing  power
output with meter on dummy load and also scope in parallel to  load.
 
73 DE AF6TB (formerly K6TRB) ..
**************You're invited to Hollywood's biggest party: Get Oscars
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[Jack Smith-6]

This sounds  very much like the problem I had with a defective U3
(SSM2165 compressor chip) on the KSB2 board.

One check is to look at U3's voltage at Pin 4. It should be about 1.5 to
1.7V. Mine measured 4.7V.  A defective U3 causes the TX to lock on in
VOX mode, which is exactly what you observe. The only way out is to
power down the K2. The audio is distorted and weak as well.

The solution is a new U3.

Jack K8ZOA


[hidden email] wrote:

> ((I have K2 s/n 06660 with: KAT100-1, KDSP2, KNB2-R, KPA100-R,  KSB2-R, KUSB.
> Completed assembly of all and installed all modules. Confirmed  power output
> on all bands per K2 and KPA100 procedures.))
>  
> Two problems:
>  
> 1) Holding [VOX] 1 sec to select between normal PTT, SPCH 0.2, SPCH  0.4, or
> SPCH 1.0 doesn't work. First push and hold locks up in SPCH 0.2 mode and  
> further pushes do nothing - "L" is flashing, cannot cancel. Only way to cancel  is
> to power down and back up.
>  
> 2) Although power output confirmed on all bands and various power  levels (5,
> 10, 20, 50, 100 W), I do not seem to get full power on SSB with hand  mic (I
> suppose that makes sense with SSB, no carrier, if no sound into mic then  no
> output?) but I see no variation in power if I speak into mic - Observing  power
> output with meter on dummy load and also scope in parallel to  load.
>  
> 73 DE AF6TB (formerly K6TRB) ..
> **************You're invited to Hollywood's biggest party: Get Oscars
> updates, red carpet pics and more at Moviefone.
> (http://movies.aol.com/oscars-academy-awards?ncid=emlcntusmovi00000001)
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>  

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