HW-101 Kits

[Steve Harrison]

At 03:00 PM 11/26/98 -0500, AUGUSTO YIPMANTIN wrote:
>** Proprietary **
>
>Hello group,
>
>Here in the office I found 2 boxes containing a complete HW-101 xcvr. kits
ready to assemble, in each one, but without power supply.
>Can anyone tell me where to find the schematics from a power supply to
match voltage req's for the HW-101 ?

The manuals will have a page listing the power requirements of the radios;
try looking for the specs page in the manual (this will probably be found
at the end of the assembly instructions just before the alignment
instructions, I think). There will also, in the same section of the manual,
be a pinout for the power jack on the rear of the radios. But I don't think
the radio kits will contain a mate for the power plug and its snap-on cover
which might be hard for you to find in Peru; you might want to ask for a
couple of the plugs here on these reflectors right now. They are, I think,
11-pin octal types; you need the females to mate with the radios. If you
can't find them, you will have to insert the wiring harness for the power
supply through the center hole of the power plug and solder the wires
directly to the inside of the radio's power socket.

The matching power supplies are the ubiquitous Heath HP-23x series, which
you most likely can find down there serving almost any older Heath
transceiver such as the HW-series single banders (the older of this series
has an 8-pin power plug, not the later 11-pin type) or the SB10x series
(all 11-pin type). The power supplies are sometimes found available in the
States with no radios, but not very often; the approximate asking price is
usually around $50 or so depending on physical and esthetic condition.
There are only minor differences, mostly cosmetic, between the HP-23, -23A,
-23B and -23C. If I remember right, the very earliest HW-series
single-banders may have been marketed with the HP-20 power supply, replaced
with the SB-100 came out with the HP-23 supplies which also went to the
11-pin octal power plugs. You may also be able to use the old MP-20 PS
which was marketed with earlier transmitters such as the HX-20, etc. I
believe the high voltage might be a little lower than optimum, but not by
much.

If there are still substantial numbers of old tube-type TV sets available
in Peru, you may be able to salvage a usable power transformer from one.
Also, don't neglect the power transformers from high power audio guitar
amplifiers. These might not have a low-voltage winding, however; and the
high voltage might be a little lower than desired but will at least get the
radios on the air. Such transformers, if slightly underpowered, may have to
be forced-air-cooled with a small blower or fan.

73, Steve Ko0U/1

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