[Hammarlund] Interfacing an HQ-170A to Johnson Viking 1

[Al Parker]

Hi Bill,
    I can email you 3 or 4 pix (incl. skem) showing how I did the PTT in my 
V-1 a few yrs ago.  Used a 3-pole 12vdc relay to switch the plate switch's 2 
poles & 1 to switch the external relay.  I thought I had the info on a 
webpage, but don't find it now.  Yes, it's 
http://www.boatanchors.org/viking1.htm but only some original pix, not what 
I ended up doing.
    I can't recall off the top what the needs are for the HQ-170, a bit 
surprised the HX-50 manual didn't tell you.  I can take a further look if 
you need.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

"there is nothing -absolutely nothing- half as much worth doing as simply 
messing about in boats."
   Ratty, to Mole


----- Original Message ----- 
From: "Bill McCourt - WF1L" <wemccourt at yahoo.com>
To: <hammarlund at mailman.qth.net>
Sent: Wednesday, August 12, 2009 12:24 PM
Subject: [Hammarlund] Interfacing an HQ-170A to Johnson Viking 1


Hi Folks,

I have recently purchased one of these receivers and wish to
interface it with a Johnson Viking 1 Xmitter for a vintage AM station.

I already have the DowKey TR relay.

My
question is, how to "mute" the receiver during XMIT. Is there a bridge
circuit across two pins of the "System" socket that should be shorted
when in Transmit or should a receiver negative bias voltage be applied
somewhere. I've obtained the manual for the HX-50 Transmitter to see
what the connections to a recommended XMTR might be but I'm still
confused. As far as I know, there is no PTT output installed in the
Viking XMTR either.

It looks like I'm going to have to piggyback
a power feed off the 115VAC "Plate" Off-On power switch, which is how
the Viking apparently controls the Transmit mode, to energize the
DowKey to switch antenna feeds from receiver to transmitter.

I can't find anything in the documentation available to point me in the 
right direction.

Any help or guidance would be greatly appreciated.

Thanks in advance,

Bill McCourt - WF1L
Reston, VA



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