This
unit was aquired by me in 2013 at the Southern Peninsula Amatuer
Radio Club Hamfest . It was in very good condition and most
likely had never or rarely been used since its construction in
1978. The unit came will all acessories and the little
instruction book, without which the unit would not have been very
usefull. It required very little repair. A dry-joint
prevented the unit from measuring reactance; resoldering a dodgy
looking connection brought the unit to life and then gave
sensible readings. I expect this minor fault has left this unit
"on the shelf" , and then, finally winding up at the Hamfest. It
would have been originally marketed and sold to professional AM radio
broadcast stations for antenna measurement and qualification. The
unit has very high build quality and now forms an indispensible part of
my amatuer station. The instruction book was provided with the
unit, which was very fortuneate as reverse engineering the calibration
and usage information would have been extremely difficult. I have
scanned the little book, it is a very good theoretical read on
the design of RF bridges. I hope other lucky radio amatuers may find
this scan usefull. The AM broadcast and short-wave senders are
all slowly going off air, more examples of this execellent unit will be
making their way to flea markets. Despite its age , it would
still make a fine addition to a professional radio studio/workshop.
The biuld quality of this unit is reminiscent of General
Radios' classic equipment.
The original manufacturer exists , their other excellent current products can be found at http://www.deltaelectronics.com/amprod.htm and sells the successor product to this most fine unit.
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