[TenTec] Argo V amp keying

[Rick - DJ0IP / NJ0IP]

More info on building this:

Correction to the text below:  Pin-5 is the unused pin, not Pin-4

Addition:  Where to find the "T" signal.
The T signal is on several boards (or rather several of the circuits).  My
copy of the schematic is almost impossible to read, due to its poor quality,
but I located the T signal on Pin-2 of U4 (that's a plug, not an IC) on the
RF PWB Preamp Section schematic, and also on Pin-2 of U22 on the Logic Board
schematic.  

Traditionally Ten-Tec has kept this signal on the same pin of all of the
connectors it is on, so it will probably be on Pin-2 of many of the 8-pin
connectors in the rig, BUT CHECK THE SCHEMATIC AND MAKE SURE before
soldering a wire to one of these pins.

73
Rick, DJ0IP


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Rick -
DJ0IP / NJ0IP
Sent: Wednesday, August 07, 2013 8:47 AM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Argo V amp keying

The delay circuit I referred to "is" exactly the same as used in the Model
318 amp keyer.
It uses a 100 uF capacitor and then a 10K pot in series with a 680 Ohm
resistor to ground.

For an understanding of what's going on here, a good description is given by
Phil Salas, AD5X
HERE:  http://www.ad5x.com/images/Articles/QSKDelay.pdf
Pay particular attention to the second full paragraph "QSK Un-Key Timing".

In that paper Phil describes the problem and shows how he solved it for the
IC-706.
I would not use his circuit with the Argo V because he only included a fixed
delay.
It is much more practical to have a variable delay.

In fact the easiest solution for the ArgoV guy who doesn't want to drill a
lot of holes, etc., would probably be to purchase the Model 318 Amp Keyer
and let it take care of the Un-Key timing. It has a delay control on its
front panel.
But you still have to key the 318 somehow from the Argo V.
You could do that by using the circuit Brian Lee referred to, AND you can
even leave the relay out and simply use the 2N2222 tranistor to key the 318
AMP Keyer.

"Cut into" is a bit harsh.  You don't have to cut anything.  You simply
solder a short piece of wire onto any of the several points where the "T"
signal is available.  In older rigs it was on the plug/jack of just about
every pc board. I haven't studied the Argo V circuit and never seen the
insides of one, but it can't be too difficult.  Then use that signal to key
the 2N2222.

I would mount the circuit from Brian inside the Argo V and feed the keying
line for the 318 out thru the unused pin (Pin-4) of the ACC socket on the
back.

73
Rick, DJ0IP


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Richards
Sent: Tuesday, August 06, 2013 11:32 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Argo V amp keying



On 8/6/2013 5:38 AM, Rick - DJ0IP / NJ0IP wrote:
> Nice simple circuit Lee.
> It certainly works for SSB and CW with a QSK amp, but I would think 
> the slow relays in the old 30L1 and in the AL811 would not be able to 
> follow CW keying.

______________________________________________


	Say... RW... I am asking this without much
	thought, so go easy on me...     ;-)     ;-)

	but would this situation benefit from the
	delay circuit used in the Model 318 Amp
	Key Interface to provide the sort of delay
	one might need?  If not, would one of the other
	amp delay circuits be of assistance here?  My
	Omni VII and other rigs have a delay setting,
	but I don't know about the Argonaut.

	I know you explained this to me once, but I
	am STILL wrapping my head around it and I
	wish to understand this stuff better.  Slow
	learner, I guess.

	It sounds like he will still have to cut into
	the internal T-line.

Any traction, or am I in Left Field on this?


--------------- K8JHR -----------------------

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