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GlennD wrote:Ween we switched from Sabers to XTS5000s on UHF I set the radio in a vice so it would not move and set our remote controlled spectrum analyzer on Signal Hill to the channel under test. The full size XTS UHF antenna is not full size and I compared it to a stubby. Both antennas were checked within their ranges. On our 460 frequencies the measured signal was virtually the same.
This being the case, We ordered the radios with stubby antennas. We have a few officers that are on taskgroups that need City of LA freqs. Om those radios we use the longer whip since the stubby has a narrower band width.
g8tzl2004 wrote:I have several UHF Jedi portable radios like the HT1000 (same RF board). I have found that there is a big variation in receive sensitivity between identical radios. They are all within the very pessimistic minimum spec (around 0.3uV 117dBm) but some are much more sensitive ie.around 0.14uV 124dBm - which is an enormous 7dB difference.
With portable UHF Jedi's, it appears to be the luck of the draw whether you get a sensitive one!!! I have also noticed that many of the UHF Jedi's have drifted over 1KHz off frequency. If the radio is +1Khz off and the repeater is -1Khz off, the overall error is 2Khz which can effect sensitivity.
I have found that VHF Jedi portables are more consistant - as are the Jedi mobile radios. I don't know why the UHF Jedi's are so variable as far as receive sensitivity is concerned..maybe something to do with component tolerances.