Video Receivers characterization
Posted: Tue 10 Aug 10 2010 7:02 pm
I just did a side-by-side comparison between the Lawmate 2.4GHz receiver (which uses ComTech modules), the IF 2.4GHz receiver, a Chinese 2.4GHz video receiver that uses Airwave modules internally, and the Foxtech RC302 2.4GHz receiver. In this test, all were connected to an unmodulated 15mW source through a stepped attenuator chain of 125dB.
Lawmate RX-2460CK
Link: http://www.nghobbies.com/cart/index.php ... ucts_id=92
Nominal operating voltage: 12V
Minimum operating voltage: ~10V (IF) GP-737 (a.k.a. GP-707 - different casing and styling)
Link: http://www.nghobbies.com/cart/index.php ... cts_id=348
Nominal operating voltage: 8V
Minimum operating voltage: ~6.5V Foxtech RC302 (SKY-RX2188)
Link: http://www.foxtechfpv.com/foxtech-24g-8 ... p-182.html
Nominal operating voltage: 12V
Minimum operating voltage: ~6.5V Chinese Airwave (AWM634RX) based receiver
Link: n/a
Nominal operating voltage: 12V
Minimum operating voltage: ~6.5V It would appear that all these receivers perform quite similarly on basic tests, as far as sensitivity go. All go into full-quieting (black screen with no noise) at around -85dBm. This doesn't tell us very much about actual performance, though. For that, we will be doing an actual reception testing with a video transmitter with a standard video feed.
Update: The RC302 receiver has also been tested and the adjacent channel blocking starts around -65dBm. In this regard, the Lawmate receiver is a bit better, with blocking starting around -60dBm.
Daniel
Upon initial inspection, it is plain that the RC302 is considerably smaller (and also lighter @43.5g) than all the other units. This may be important for installations which are carried around by the user (such as a belt mounted setup.) The Chinese unit came in a large and heavy steel case that had begun to rust by the time of this testing. Specifications wise:-Lawmate RX-2460CK
Link: http://www.nghobbies.com/cart/index.php ... ucts_id=92
Nominal operating voltage: 12V
Minimum operating voltage: ~10V (IF) GP-737 (a.k.a. GP-707 - different casing and styling)
Link: http://www.nghobbies.com/cart/index.php ... cts_id=348
Nominal operating voltage: 8V
Minimum operating voltage: ~6.5V Foxtech RC302 (SKY-RX2188)
Link: http://www.foxtechfpv.com/foxtech-24g-8 ... p-182.html
Nominal operating voltage: 12V
Minimum operating voltage: ~6.5V Chinese Airwave (AWM634RX) based receiver
Link: n/a
Nominal operating voltage: 12V
Minimum operating voltage: ~6.5V It would appear that all these receivers perform quite similarly on basic tests, as far as sensitivity go. All go into full-quieting (black screen with no noise) at around -85dBm. This doesn't tell us very much about actual performance, though. For that, we will be doing an actual reception testing with a video transmitter with a standard video feed.
Update: The RC302 receiver has also been tested and the adjacent channel blocking starts around -65dBm. In this regard, the Lawmate receiver is a bit better, with blocking starting around -60dBm.
Daniel