[NLRS] Using a Radio Shack HTX-10 as a 28 Mhz IF

[Jim Hermanek]

Carl, et all....

Some additional thoughts about the HX-10 that may be of interest.....   I'm
going to try and use one with a 222 Mhz transverter....

First,  the step tuning I believe is selectable to 1 khz steps with a
"clarifier" to tune (both xmtr & revr) within the the steps.....  This may
be cumbersome to get used to, but for the price and the occassional use 222
gets it may be an economical approach.

I located a switched positive voltage in the diode switching that drives one
of the transmitter driver amplifiers and plan to use that voltage to drive
an isolating transistor stage that pulls up a relay that in turn grounds the
transverter PTT.  Again, perhaps, a bit of a kluge, but a small relay board
kit is available from DEM (#PTT 5X) for this purpose.    I'm also using the
DEM transverter interface (AOS-28) to split out separate xmt & rcv plus
attentuate the 22 watt output of the HX-10 to the 100 mw max of the
transverter....

As for lack of CW operation, some who have tried to QSO with me on CW will
not miss the lack of CW on the HX-10, but I am planning on building up a
small oscillator to inject into the mic line for this capability.   This is
down the road a ways, and I'm not in much of a hurry to get CW although a
rare Aurora may give me incentive....

I hope to have this up and running for the June VHF weekend, but am waiting
on the transverter & interface boards.....

I'll let you know how it turns out when I get it together.....  If anyone
has some suggestions or "watch-out-fors" to pass along, I'd glady hear
them.......

 BTW, if you would like a copy of the service manual & schematic for the
HX-10, let me know & I'll mail one over...

73s

Jim     K0KFC
----- Original Message -----
From: <jcplatt1@mmm.com>
To: "Carl Estey" <cestey@mn.rr.com>; <NLRS@mailman.qth.net>
Sent: Thursday, May 15, 2003 7:58 AM
Subject: Re: [NLRS] Using a Radio Shack HTX-10 as a 28 Mhz IF


>
> Not familiar with the HTX-10 Carl.   I use a slightly modified HR2600 on
> 222 and a HR2600 with a 2m DEM board installed internally for a 2304 IF
> rig.     For T/R control of the transverters, I just rooted around on the
> PC board with my voltmeter until I found a "control line" that went
> positive on transmit .... I think it goes to +9 vdc on transmit, and used
> that to drive the base of a 2N2222 thru a 10K ohm series resistor.    The
> transistor then drive a small relay for transverter T/R control.   Both
> systems have been operational for several years including a rove or two.
>
> 73, Jon
> W0ZQ
>
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