Some scope traces for use in a future article

Here is my 900mhz gear.

lawmate 500mw 900mhz tx ~$50 Includes heat sink, filter, home built antenna and filtered 5v output to audio and video sources, waterproofed on circuit board designed to hold 3s 500mah battery for ~1hr of flight time.

Lawmate 900mhz rx 2 at ~$50 =$100

Lawmate switching 900mhz rx $75

flat panel antenna 900mhz 10 dbi 2 at $40 each $80


Chinese 1watt tx with 2 rx ~$120 (probably a little more)

Band pass filter, to only let 900mhz through. a little heavy, but a quality filter. ??

Misc antennas ??

roughly $400 in gear at roughly new prices.

Here is my 900mhz gear.

lawmate 500mw 900mhz tx ~$50 Includes heat sink, filter, home built antenna, has filtered 5v power on two jacks, one for video, one for audio. Video tested working, audio not tested.

Lawmate 900mhz rx 2 at ~$50 =$100 Both tested for video not tested for audio.

Lawmate switching 900mhz rx $75 Tested working for video, not tested for audio

flat panel antenna 900mhz 10 dbi 2 at $40 each $80


Chinese 800mw tx $59 Tested, working for video, not tested for audio.

Two 12 ch rx's, tested working on 910mhz. $50 each new. Tested working at least for video, not tested audio

1.2 watt mobicomm Tx. ($125 orig price, hard to find, very powerful. needs a good heat sink on the amp. This Tx had a mic mounted, but I have not confirmed that the mic works. The Tx produce a very nice image on all the Rx's and a significantly higher power out as compared to the others as measured on my frequency counter.

2 Band pass filters, only letting 850-920mhz through. a little heavy, but a quality filter. ??

Misc antennas ??

I have checked each TX to see that it broadcasts a video image to the Rx's on 910 mhz. I have checked all Rx's to see that they receive a video broadcast on 910 mhz. I have not tested any of them with audio, as I don't have a mic set up at the moment.