9 Dec
2010
9 Dec
'10
2:13 p.m.
Forwarded from the Greenkeys list.
Looks like an interesting piece of test gear:
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=370462778137
[...]
You can either use it as a loop keyer, or, if you need
loop power, it will
provide that as well.
You can send distorted signals up to 44 per cent switched bias, and can
measure incoming bias and distortion as well.
I still have (and use) a TDMS5 made by ATE (part of Plessey I beleive).
This is a somewaht simialr thing that wil lsend the Quick Brown Fox
message (albeint in Baudot only), or a repeated character (set of toggle
switches) with cotnrollable distortion. It'll also display distortion on
the incoming signal, test relays for bais and transit time, etc.
Alas I don't have the companion TDMS6 which is a receiver only, but does
rrater more tests on the incoming signal
Oh, and it is entirely valved (maybe with semiconsductor diodes, but none
of those new-fangled transistors!) [1]. Yes I ahve the manual includign
schematics and parts lists.
[1][ In case you'rewondering, the Quick Brown Fox messge is stored on a
rtoating disk with sping contacts to read off the 5-bit characters.
There's an exploded view of the mechanism with set-up instruction in the
manaul.
I also have a much later test signal geneator (only, no receive fuctions
at all) made by Trend. I really mustget that going sometime..
-tony