[Elecraft] PSK PTT doesn't work with USB to serial converter

[Casey]

Windows DM says everything is fine. Tried various settings of the 
device, no change.  I dug up another USB-to-Serial in the junk box and 
it is definitely Prolific.  It appears to trigger PTT with that one (not 
totally sure, but the rx mutes), but no audio gets through so maybe 
not.  However, it doesn't release the rig from mute/PTT, whatever state 
it's in.   I put the cable back on the desktop and all works there OK.  
Haven't had time to take stuff down to the bench to check voltages yet.

73,

Casey

On 7/3/2010 1:29 PM, Mike wrote:
>  No comfort for you, but my USB to serial converters all use a 
> Prolific driver, and work flawlessly on my Win XP Pro box. I don't 
> know the diff between the brands, I think it may have to do with being 
> able to work at slower speeds.
>
> What does Windows Device Manager have to say? Does it show up there 
> with no conflicts? If so, is the port number the same one your 
> software is set to? If you can toggle RTS, you could put an ohmeter 
> across the output and see if it changes state.
>
> 73, Mike NF4L
>
> On 7/3/2010 2:49 PM, casey at tomochka.com wrote:
>> I have a working PSK31 setup with my K2 using a homebrew serial to K2
>> mic cable. That is, it works FB with my desktop computer that has an
>> actual serial (DB9) port. I'm trying to now use an XP netbook, which has
>> no serial port. Instead I'm using a USB to serial converter (Sabrent
>> brand). The driver seems to have installed correctly, but not
>> combination of settings of the device or Digipan results in PTT being
>> activated.
>>
>> Anyone know how I can debug the device to see if it's setting RTS?
>> Perhaps the signal level is too low?
>>
>> I don't know for sure, but I think this converter uses a Prolific chip
>> and I have read that for CAT people have better luck with an FTDI based
>> converter. What is the difference between the chips that makes FTDI
>> better?
>>
>> 73,
>>
>> Casey
>>
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