[Heathkit] Heath HP-23 question

[Glen Zook]

Actually, the HP-23 did have an option for either 250
volts or 300 volts.  However, you had to change a
jumper inside of the unit.

Starting with the HP-23A Heath added a switch so that
the power supply could be used on various pieces of
equipment without having to make a "hard wire" change.

My SB-101 is quite happy with the 300 volt as have
been a couple of SB-102 units that I have worked on. 
But, my SB-110A definitely does NOT like the 300 volt
position.  If I remember correctly (am not looking at
the manual right now) the manual states that the 250
volt position is to be used on the SB-110A.

There are other changes in the various HP-23 series
supplies.  The HP-23 and HP-23A have both 6.3 VAC and
12.6 VAC available for the heaters ("filaments") but
the HP-23B and HP-23C have only 12.6 VAC.  The HP-23
can only be operated from 120 volt sources but all of
the later versions have dual primary windings and can
be used on both 120 VAC and 240 VAC by a simple wiring
change.  Some of the HP-23 use a fuse in the 120 VAC
line and the later versions use a circuit breaker. 
The HP-23 only has a fixed bias available while the
later versions have both fixed bias and a
potentiometer in line for a variable bias.

When used with the Heath SB-100, SB-101, SB-102,
HW-100, and HW-101 series transceivers any of the
HP-23 
power supplies should work fine.  With the monobanders
I believe that you need to use the 250 volt setting.

When using the HP-23 series with Collins equipment (in
place of the 516F-2) you need the versions with the
variable bias since most of the Collins S-Line does
not have a built in bias control.

Glen, K9STH



--- Richard Franzson <franzsrf at umdnj.edu> wrote:

I have a HP 23 with a toggle switch for LV-off-HV. On
the SB 101 which setting do I use? And on a SB-102
which setting do I use? Also,  can someone please tell
me why the newer HP 23 power supply has an option for
voltage levels. And the old version HP 23 did not.

Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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