[amsat-bb] Re: L'ers equipment

Edward R. Cole al7eb at acsalaska.net
Wed Sep 13 07:37:59 PDT 2006

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


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!
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

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