Although it is an extreme case I thought it relevant to add, my stupidity. I installed an advanced receiver research 144mhz preamplifier on my 706MKIIG in my VW GTI to have some 2 meter SSB fun. After the GAS FETs in that preamp had failed twice I realized the likely culprit was my 25 watt APRS beacon coming from the adjacent antenna.
-Larry On Jul 28, 2010, at 10:16 AM, Gary Pearce KN4AQ <[email protected]> wrote: > At 09:34 AM 7/28/2010, Mike Murphy wrote: >> I am considering adding an Icom 880 to the car along with the Icom 2720 >> that is already installed. My concern is having 2 radios on the same band >> blasting 50 watts into the other receiver. >> Am I making a mountain out of a molehill or is having 2 radios on the >> same band running that much power a bad idea? >> >> Michael Murphy - KD8OK > > Wow, look at all the hams who have multiple VHF/UHF radios in their mobiles. > I'm proud of you guys! > > I have a 2820, Yaesu 8900 and ICOM 706 (and Alinco 220, CB, a DVAP and a > scanner) all in a little RAV4, with antennas distributed around the roof and > front cowl. > > No worries on damaging or "burning out" a front end, even at high power > (though I'd keep at least a couple of feet between antennas). Expect to > desense any other radio in the same band when you're transmitting, though if > you're at 5 watts, you'll still be able to hear strong repeaters. > > Every transmitter also has weak "spurs" (spurious signals) that you'll be > close enough to hear on random frequencies. And your VHF signal will have a > "strong" third harmonic at 3x your transmit frequency. They'll be heard in > the UHF band (for example, if you transmit on 147.45, you'll hear a big > signal on 442.35 - the FCC knew what it was doing when it assigned hams > "harmonically related" bands). > > ARVN: Amateur Radio//Video News > Gary Pearce KN4AQ > 508 Spencer Crest Ct. > Cary, NC 27513 > [email protected] > 919-380-9944 > www.ARVideoNews.com > >
