Scott Dorsey wrote in :
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.

Thanks very much, Scott. That's good to know, but Googling produces only
three partial references for GRAS Instruments, apparently in Quincy, MA.
Can anyone provide contact data for Mr. Rasmussen or for GRAS Instruments?

--
Mike Andrews, W5EGO

Tired old sysadmin