[TenTec] QSK Bug in O2 2.031

[Ron Castro]

Grant:

70 WPM is way more than I'll ever need!!  At any rate, I only set QSK to
drop out between letters, not individual dits and dahs.

The radio is definitely telling the amp to transmit and stay in transmit.  I
check the voltages on the TX OUT line just now in both version, and here are
my findings:

v. 2.030:

    Orion II in RCV, amp in Standby = 3.29 V
    Orion II in XMT, amp in Standby = .018 V
    Orion II in RCV, amp Ready: = 23.16 V
    Orion II in XMT, amp Ready (xmitting) = .034 V

v. 2.031:

    Orion II in RCV, amp in Standby = 3.29 V
    Orion II in XMT, amp in Standby = .018 V
    Orion II in RCV, amp Ready: = .034 V (after a few initial transmissions.
Amp stays 'triggered')
    Orion II in XMT, amp Ready (xmitting) = .034 V

Going back to v. 2.020 cures problem.

I see where the problem may lie:  The 23.16 Volts on the line when it is in
Ready...that's higher than TT recommends, and could have something to do
with the problem.  Actually, as I read the schematic of the Titan, it should
be around 28 V.  What may be needed is transistor in between to key the
23.16 V and isolate it from the Orion II.

I'll send this to TT and see what the response is.


Ron
N6AHA

----- Original Message ----- 
From: "Grant Youngman" <nq5t at comcast.net>
To: "'Ron Castro'" <ronc at sonic.net>
Sent: Saturday, March 04, 2006 8:38 AM
Subject: RE: [TenTec] QSK Bug in O2 2.031


>> In both my case and Gene's we are using TT amplifiers that
>> implement QSK "the right way" according to TT.  I wonder if
>> there is any difference with TT and other amps?
>
> The PIN diode switch in the AL-1200 manages the loop handshake correctly.
> The connections for my amp match the diagram in the Titan manual, as shown
> for connection to a Ten-tec transceiver.
>
> If you do a search on the archives of the tentec at contesting list, you will
> find some extremely heated discussion about Orion and Titan (don't 
> remember
> if it was a 425 or III) QSK issues which had to do with one of the list
> members (W4BQF) normally running cw at 70+ wpm.   At that speed there was 
> a
> problem with the interface to the Titan.  He had a real issue, but he was
> the only one with this very high speed interface problem and QSK was 
> running
> normally for most of the rest of us "slow readers".  I don't recall T-T 
> ever
> fixing the problem, and haven't seen Tommy around the list for a while.
>
> But this was a different issue than you are seeing.  Do you know if the
> Orion II is glitching and holding TX OUT low and continuing to key the amp
> after switching back to receive, or if the amp is just deciding on its own
> to remain keyed after TX OUT goes high?
>
> Gant/NQ5T
>
>
>