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

[Al Parker]

HI Bill,
    We lost power shortly after my last msg, just got it back.  I was adding 
to the webpage I'd started, incl. those files, so you can download them from 
that page when I get it in place in a few minutes.  It'll be on that same 
page, I've added what I did to the xmtr.  Give it a try shortly.
    I saw Bob's post just b4 the pwer went down, so hopefully you've got 
that part figured.
73,
Al
----- Original Message ----- 
From: "Bill McCourt - WF1L" <wemccourt at yahoo.com>
To: "Al Parker" <anchor at ec.rr.com>
Sent: Wednesday, August 12, 2009 3:11 PM
Subject: Re: [Hammarlund] Interfacing an HQ-170A to Johnson Viking 1


That would be great!

My email is wemccourt at yahoo.com and if you could put the pictures in a zip 
file to squeeze them down in size a bit.

Bill-WF1L
Reston, VA

--- On Wed, 8/12/09, Al Parker <anchor at ec.rr.com> wrote:

From: Al Parker <anchor at ec.rr.com>
Subject: Re: [Hammarlund] Interfacing an HQ-170A to Johnson Viking 1
To: "Bill McCourt - WF1L" <wemccourt at yahoo.com>, hammarlund at mailman.qth.net
Date: Wednesday, August 12, 2009, 1:47 PM

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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