[WT-support] Parallel-Port question WT & TS 850

[f8crh, Franck]

Hello,

Same problem here with TS850 and all computers.
TS850 don't like semicondutor junction (opto, transistor, diode...) between 
PTT to Ground.
All is OK if you add the vox

73's
Franck, F8CRH

----- Original Message ----- 
From: "Olivier F5MZN" <olecam at f5mzn.org>
To: <support at win-test.com>
Sent: Monday, November 10, 2008 8:37 AM
Subject: Re: [WT-support] Parallel-Port question WT & TS 850


>
> Rick Dougherty NQ4I wrote:
>> Hi Lenz...I have the same type of problem here at NQ4I M-M...some
>> printer ports have a floating ground and some do not...I think if you
>> check you will find a difference..de Rick NQ4I
>
> I've the same problem with my 850's in combinaison with some PC too,
> using an optocoupler interface.
>
> I think the problem was rather the capabilities for the LPT port to
> deliver enough current to the LED of the optocoupler. In some situation,
> the transistor is not saturate enough which causes the PTT signal not to
> be well detected by the radio. Then, I press VOX which is an easy fix! ;)
>
> 73,
> -- 
> Olivier / f5mzn
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