wolfgang@wsrcc.com (Wolfgang S. Rupprecht) (05/09/91)
Curiosity just got the better part of me and I decided to see what makes my radar detector tick. The model is a Whistler-303 superhet X/K band unit. It is composed of two modules: a pc board with three leds / switch on it, and the RF horn and detectors. The only real components on the led board is a Motorola SC94437CP chip and an 8v regulator. The two modules are connected with 4 wires. 1) +12v 2) 0.6 v (rf detected signal out ??) 3) 5v pulse - 1.2ms high, 50ms low, 0.3 ms frame rate jitter 4) gnd The pulse line is a big mystery to me. It appears to be a line that can be momentarily grounded to go into city mode, or momentarily sorted to the regulated +8v to go into "dark mode". At least I think that it is dark mode toggle - the leds all go off. (There is an unpopulated section of the PC board where this switch would go - so I tried it to see what would happen. When it goes into dark mode, the current drawn from the supply stays normal, so I assume the device isn't going into latch up. ;-) ) The RF module has a 5v regulator on it, and 4 pin-filters lead the 4 signals into the RF module. I was hoping to find a an obvious sweep signal and a detector signal so that I could display Frequency vs. Amplitude in x-y mode on a scope. I guess that is all buried deeply in the RF "can" section where I can't easily get to it. I as still puzzled about the "pulse" signal passing between the two modules. Does anyone have any info to shed light on this mystery? -wolfgang -- Wolfgang Rupprecht wolfgang@wsrcc.com (or) uunet!wsrcc!wolfgang Snail Mail Address: Box 6524, Alexandria, VA 22306-0524
bur@ultisol.gsfc.nasa.gov (M.J.C. Bur) (05/13/91)
In article <1991May9.152259.8545@wsrcc.com> wolfgang@wsrcc.com (Wolfgang S. Rupprecht) writes: [Info. on Radar detector deleted] >-- >Wolfgang Rupprecht wolfgang@wsrcc.com (or) uunet!wsrcc!wolfgang >Snail Mail Address: Box 6524, Alexandria, VA 22306-0524 ^^^^^^^^^^^^^^ Hey Wolfgang, aren't those things illegal in Virgina? :-) :-) In a related topic has anyone had an experience with the new laser gun. I think in principal, it is the same as the Radar gun only it emits a laser beam and detects it when it is reflected. Ho Hum. It won't be too long before our car's dashboards resemble an F/A-18 cock pit. :-) Like the song says "I fought the law, and the law won." -- ------------------------------------------------------------------ M.J.C. Bur | Internet: bur@ultisol.gsfc.nasa.gov NASA/GSFC Code 923 |------------------------------------------ Greenbelt, MD 20771 | Disclaimer!? Hell, I don't even know 'er