[Elecraft] [K2] Setting audio drive level when using VOX

[Gareth M5KVK]

Aah, that would explain it.
Nomatter, I’ll connect up the CAT and use that.

Thanks, Don
73

Gareth - M5KVK
gareth.m5kvk at gmail.com
m5kvk at m5kvk.org



> On 18 Aug 2015, at 12:30, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> 
> Gareth,
> 
> The VOX on the K2 is the weak point in the KSB2 design.  You will be better off using PTT on the K2.
> A simple "one transistor keying" circuit can be added to the serial port RTS or DTR (which depends on your software) to trigger the K2 PTT will give you reliable operation.
> 
> 73,
> Don W3FPR
> 
> On 8/18/2015 4:49 AM, Gareth - M5KVK wrote:
>> Hi
>> I think I may have a problem somewhere in my audio chain. I say may because
>> what I'm seeing may be correct: I'm not sure.
>> 
>> I have a Windows 7 PC running DM780 with a Tascam US2X2 connected via a
>> 20dB pad (10k/1k) to the Mic connector on the K2. I am using VOX, so
>> there's no other connection.
>> 
>> When I increase the Line Out on the Tascam to point at which the VOX
>> operates, I immediately see one bar on the ALC. The bar is pretty steady:
>> maybe very slight flashing. Regardless of further Line Out increases, I
>> never see more than one bar.
>> 
>> I understood that the drive level should be adjusted to the point of one
>> bar ALC and then backed off slightly so that ALC is only flashing
>> occasionally. If I back off even slightly, the VOX drops out.
>> 
>> Is this an artifact of the VOX? i.e. the VOX activation level is too high?
>> Is it an indication that the 20dB pad is too high? Or is this normal and I
>> just adjust Line Out until the VOX opens and then leave it there: even
>> though one bar of ALC is on.
>> 
>> 
>