Wireless Set B70
The B70 is a portable
microwave relay, operating in the frequency range 4580 to 4860MHz.
It could provide up to 14 channels at 20MHz spacing. In operation
the unit used two dish aerials with the unit mounted behind them,
all supported on a tripod.
It worked line of sight
- approx 20 miles - and this could be extended by using B70's as
relay stations in between.
|This equipment uses two
CV228 heil tubes, one for transmit and one
for receive, which can be seen here. The two cavity assemblies can
be seen along with the heil tube magnets.
||Here is a closeup of the
receiver heil tube showing the magnet and the base of the valve.
The later Wireless Set B70
No. 2 used CV485 heil tubes.
These photographs are copyright
Peter Barker and used with his kind permission. Peter also provided information
on the set.
This file was last modified
15:30:49, Tuesday September 02, 2014
FOR SALE: Note that any valve which is not CV marked is now for sale. Contact me via email - see the home page.