At 04:51 PM 9/12/2006 +0000, w7lrd@comcast.net wrote:

Hello I would like an informal survey regarding what you are using for Mode L.

I am working on my system and do not want reinvent the wheel. The format of radio-power-transmission line-antenna/gain. I use a IC-1271A-10 watts-50 feet LMR400-12T helix about 12 db gain (or so). I need to improve my system and as usual your advice is invauable. Perhaps several on the list could benifit from this. The current AO-51 in L/S is an excellent chance to fine tune my system.

73 Bob W7LRD Seattle

Bob,

Your feedline loss is 2.4 dB so that approx. 5.8 w are getting to the helix. Your ERP is slightly below 100w. That would be very low if this were AO-40. I ran 10w at antenna with 20-dBi gain for ERP 0f 1000w for AO-40 amd way marginal (one s-unit above noise floor). I have no info re: AO-51, so will have to wait for that.

73's Ed PS: When I get tower back up, I will be able to run 20w to two lloop-yagis 23-dBi for ERP of ~4000w! 73's, Ed - KL7UW ========================================= http://www.qsl.net/al7eb - BP40iq 144-EME: FT-847, mgf-1801/1402, 4xM2-xpol-20, 170w 432-EME: FT-847, mgf-1402, 1x21-ele (18.6 dBi), 60w =========================================