[Swan] Mic. impedance question (one last time)

Wed, 19 Jun 2002 22:27:46 -0400

Not at all familar with the 250, but with the the VOX-2 installed on the
350C, 500CX, etc., when you place the mode switch in CW and place PPT/VOX
switch in the VOX position, with key closure the transmitter will go into
transmit mode (length of delay before it returns to receive mode dependent
on VOX-2 control adjustments) and will revert to receive mode when keying
stops.  When in the PPT position, the CW mode switch position has
transmitter one continuously - because the 500CX has a 5 position mode
switch subject to failure, I generally operate CW by placing transmitter in
CW mode and switching the PPT/VOX switch back and forth to save wear and
tear on the mode switch (of course you can just leave it in VOX and operate
semi-break in, but sending irregularities will have it switching back and
forth between transmit and receive frequently).
Note at all sure that this applies to the 250!!!

Bob  NB3W

----- Original Message -----
From: "Steve Harrison" <[email protected]>
To: "Jacob Tennant" <[email protected]>
Cc: <[email protected]>
Sent: Wednesday, June 19, 2002 7:17 PM
Subject: Re: [Swan] Mic. impedance question (one last time)

> At 05:59 PM 6/19/2002 -0400, you wrote:
> >PS: FOR CW OPERATIONS, can the radio be set to TX via the PTT button for
CW
> >TX? My logging software offers automated CW operations (TRLog).
>
> Not unless modified. You normally have to switch into CW mode to transmit
> on CW; it won't transmit CW in the LSB or USB modes (I guess your older
250
> only has USB?). There should be some sort of modification instructions on
> N0QMO's site (which, IIRC, is as applicable to the 250 as to the HF radios
> (350 and 500). Basically, when the switch is put into CW, it closes the
> transmit-receive relays; the mod would break that connection so the relays
> don't close unless you close the PTT line. BTW, DO NOT attempt to key the
> PTT line of the Swan radios with your computer; you need a simple
interface
> circuit which can handle a coupla hundred mils at 12VDC. Your computer's
> COM board cannot switch more than a couple of milliamperes and you'll blow
> the board's switching circuit. The interface circuit will easily key the
> radio's PTT circuit when you close the key or PTT line.
>
> There may be more involved in this mod, I can't remember right now.
>
> Steve, K0XP
>
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