A recent addition to the grotto is a
Wandel & Goltermann LMS No 36A, built to a
Post Office Telecommunications specification.
When built it was designed to be powered by two PP9 type batteries or by a
POTel / BT Power Unit No 91A. Not having two PP9 batteries nor a PU No 91A to paw, a quick search produced an
ITT MQ1B Professional Stabilised PSU whose output could be precisely set to 18V.
After performing the calibration process, as detailed in the extensive product manual, it was decided that the
Oscar's output would be examined . . . as it was the subject of previous measurement attempts, when I was guided by the advice of
4candles. The result? It appeared that the
Oscar, when set to send 0 dBm into 600 Ohms, was producing -0.5 dBm at a frequency of 1.15 kHz. (
Hmm . . . Perhaps I should repeat the measurement with the
LMS No 36A bandwidth set to 24 Hz rather, than the 1 kHz which was previously used.)
[somewhat off topic]
There are a pair of Wandel & Goltermann "bricks", power supplies and manuals, all housed in an "Antler" case, up for auction at a certain on-line site --
http://www.ebay.co.uk/itm/161723353908Currently there are no bids and
b*cat will not be bidding for them!
[/somewhat off topic]