[Icom] 706 MKII keying & using amp???

Tue, 31 Dec 2002 18:16:28 -0800

Hi Larry,

My apologies for all the misunderstandings. In my original response, I
thought you had inquired about the IC-707, which uses a relay. I mistyped
IC-707 as IC-706, which added to the confusion.

The IC-706 has a solid-state keying circuit; the specs follow.

Pin 2 GND Connects to ground. (red)

Pin 3 HSEND Input/output pin (HF/50 MHz). Goes to ground when transmitting.
When grounded, transmits (connected to 8V line thru 2.2 k? resistance/144
MHz operation). Ground level :-0.5 V to 0.8 V.  Input current : Less than 20
mA (HF/50 MHz bands) (orange)

You should be able to build up a simple 2-transistor buffer circuit to
safely key the Alpha 76CA. from the HSEND line.

Cheers for now, 73,
Adam VA7OJ/AB4OJ

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of W3UIO
Sent: Tuesday, December 31, 2002 17:53
To: [email protected]
Subject: RE: [Icom] 706 MKII keying & using amp???

--- Adam Farson <[email protected]> wrote:
>
> If you have access to the Alpha 76CA, you should be
> able to measure the
> keying voltage and current. The 16V/0.5A rule still
> applies, although the
> IC-707 should be safe with the older Alpha spec of
> 27V/7mA.

I measured the keying voltage at 27 volts.

Are you saying that the 706 would be safe with that;
i.e., no buffer?

=====
Larry, W3UIO

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