antenna trimming?
in [Repair]
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From: mm on 28 Nov 2009 23:47 Thanks for the helpful replies about the car radio that would only get a couple AM stations. The guy ignored my advice about trimming the antenna, and just bought another antenna, even though the one he had had worked fine with the previous radio. The new radio worked fine with the new antenna. Did he just get lucky? Thanks.
From: AZ Nomad on 28 Nov 2009 23:55 On Sat, 28 Nov 2009 23:47:31 -0500, mm <NOPSAMmm2005(a)bigfoot.com> wrote: >Thanks for the helpful replies about the car radio that would only get >a couple AM stations. The guy ignored my advice about trimming the >antenna, and just bought another antenna, even though the one he had >had worked fine with the previous radio. >The new radio worked fine with the new antenna. Did he just get >lucky? No. He ignored your idiotic advice and replaced a defective antenna. Did you propose he trim and replace metal every time he changes channels?
From: Michael A. Terrell on 29 Nov 2009 01:05 AZ Nomad wrote: > > On Sat, 28 Nov 2009 23:47:31 -0500, mm <NOPSAMmm2005(a)bigfoot.com> wrote: > > >Thanks for the helpful replies about the car radio that would only get > >a couple AM stations. The guy ignored my advice about trimming the > >antenna, and just bought another antenna, even though the one he had > >had worked fine with the previous radio. > > >The new radio worked fine with the new antenna. Did he just get > >lucky? > > No. He ignored your idiotic advice and replaced a defective antenna. > > Did you propose he trim and replace metal every time he changes channels? 'Trimming the antenna' means to adjust a variable capacitor to compensate for the capacitance of the coaxial cable. It affects the gain on the upper end of the AM band, since the antenna is used as a voltage probe, rather than a typical antenna design. It was standard procedure whenever a car radio was installed or repaired to 'trim' it as the last step of the job. Most US car radios allowed the adjustment by removing the tuning knob and using a small screwdriver to adjust the capacitor. A lot of cheap imported radios had no adjustment, and had very poor AM BCB performance. It has absolutely nothing to do with cutting metal. -- The movie 'Deliverance' isn't a documentary!
From: Klaatu on 29 Nov 2009 02:23 "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message news:tIednfxuCIPUko_WnZ2dnUVZ_vKdnZ2d(a)earthlink.com... > > AZ Nomad wrote: >> >> On Sat, 28 Nov 2009 23:47:31 -0500, mm <NOPSAMmm2005(a)bigfoot.com> wrote: >> >> >Thanks for the helpful replies about the car radio that would only get >> >a couple AM stations. The guy ignored my advice about trimming the >> >antenna, and just bought another antenna, even though the one he had >> >had worked fine with the previous radio. >> >> >The new radio worked fine with the new antenna. Did he just get >> >lucky? >> >> No. He ignored your idiotic advice and replaced a defective antenna. >> >> Did you propose he trim and replace metal every time he changes channels? > > > 'Trimming the antenna' means to adjust a variable capacitor to > compensate for the capacitance of the coaxial cable. It affects the gain > on the upper end of the AM band, since the antenna is used as a voltage > probe, rather than a typical antenna design. It was standard procedure > whenever a car radio was installed or repaired to 'trim' it as the last > step of the job. Most US car radios allowed the adjustment by removing > the tuning knob and using a small screwdriver to adjust the capacitor. A > lot of cheap imported radios had no adjustment, and had very poor AM BCB > performance. > > It has absolutely nothing to do with cutting metal. > > ___________________________ You forgot to mention that with age, the antenna coaxial cable would get water in it, and reception would suffer. Adjusting the trimmer would make little or no difference in this situation. Replacement was the only fix.
From: mm on 29 Nov 2009 02:46 On Sun, 29 Nov 2009 01:23:58 -0600, "Klaatu" <movealong(a)nospam.net> wrote: > >"Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message >news:tIednfxuCIPUko_WnZ2dnUVZ_vKdnZ2d(a)earthlink.com... >> >> AZ Nomad wrote: >>> >>> On Sat, 28 Nov 2009 23:47:31 -0500, mm <NOPSAMmm2005(a)bigfoot.com> wrote: >>> >>> >Thanks for the helpful replies about the car radio that would only get >>> >a couple AM stations. The guy ignored my advice about trimming the >>> >antenna, and just bought another antenna, even though the one he had >>> >had worked fine with the previous radio. >>> >>> >The new radio worked fine with the new antenna. Did he just get >>> >lucky? >>> >>> No. He ignored your idiotic advice and replaced a defective antenna. >>> >>> Did you propose he trim and replace metal every time he changes channels? >> >> >> 'Trimming the antenna' means to adjust a variable capacitor to >> compensate for the capacitance of the coaxial cable. It affects the gain >> on the upper end of the AM band, since the antenna is used as a voltage >> probe, rather than a typical antenna design. It was standard procedure >> whenever a car radio was installed or repaired to 'trim' it as the last >> step of the job. Most US car radios allowed the adjustment by removing >> the tuning knob and using a small screwdriver to adjust the capacitor. A >> lot of cheap imported radios had no adjustment, and had very poor AM BCB >> performance. >> >> It has absolutely nothing to do with cutting metal. >> >> >___________________________ >You forgot to mention that with age, the antenna coaxial cable would get >water in it, and >reception would suffer. Adjusting the trimmer would make little or no >difference in this situation. Replacement was the only fix. But it worked fine and got lots of AM stations with the previous radio. (He only changed the radio because he wanted something fancier.)
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