In article , mikea wrote:
I've come into possession of a Bruel & Kjaer Type 2400 VHF converter; it
appears to have an input connector that takes a car radio plug, an SO-239
output connector, and cover 10 MHz to somewhere about 300 MHz. Nice
planetary drive, with two concentric knobs, for tuning; other controls
for band switching, oscillator level, and meter type (Off, 2300, 2400),
but no meter or provision for one. It's not virgin: there's been some
hacking, but I can't tell exactly what without schematics. I can't find
anything about it through Google; anyone here ever seen one?

The input connector does not take a car radio plug; it is a proprietary
B&K connector. This device is normally used with an ultrasonic
accelerometer and a sound level meter or spectrum analyzer to measure
VHF frequencies by heterodyning them down into the audible
range and filtering them.

B&K has no docs on older products as far as I can tell, but Gunther
Rassmussen of GRAS Instruments may.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."