Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings

, June 05, 2008 11:06 AM Subject: RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings This is not entirely true. A transmitter with an isolator on it will absorb all the reflected power that reaches it. There will be no re-reflected power back up to the antenna

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings

There are several calculators on line, that might help a person decide on cablr types to use. which shows a numer of cable types to select from, and you input the length, frequency, and wattage, plus the SWR/reflected power ratio. Even at 450 MHz, an SWR ra

RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings

Hi Skipp, I can't really tell if you are agreeing or disagreeing. :>) A good, properly tuned isolator will absorb all reflected power that is of any consequence. In other words I don't think that you would be able to see any reflected power on the wattmeter from the isolator. A wattmeter in line

RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings

This is not entirely true. A transmitter with an isolator on it will absorb all the reflected power that reaches it. There will be no re-reflected power back up to the antenna. In this case reflected power does subtract from the power that is available to be radiated by the antenna. 100 watts out

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna/Power Readings

On Jun 4, 2008, at 6:36 PM, Laryn Lohman wrote: > --- In Repeater-Builder@yahoogroups.com, Wayne <[EMAIL PROTECTED]> wrote: > >> Note that forward power can sometimes read higher than true if > there is >> more reflected power. > > > Very true. Power coming back down the line is RE-reflected in

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

I beg to differ on the PEP vs Average in this instance. On an amplitude varying signal, PEP and AVERAGE are not the same (SSB or a complex amplitude modulating waveform). For FM, however, since FM has a constant amplitude signal, I believe PEP and Average will be the same. Once had a VHF Mast

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

Questions can arise here. First, what kind of wattmeter, with what accuracy level is he using. Is in an RMS or peak reading unit? Makes a difference. Where is he measuring the power. On my Mastr II 440 repeater, I show maybe 105 watts from the PA to a good dummy load. I am using a

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

Daron Wilson wrote: > atms169 wrote: >> It's the KE5KAF Dstar system in Laredo. >> 2 Meters >> 120 watts after duplexers >> Telawave 4 cans 600 Split >> Coax LMR-400 80feet >> Antenna I want to put up is a Commercial Anitron-150 Similar to a DB220 > > I must say I’m impressed. Which duplexe

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

A good source for Heliax is: Reasonable prices at this time. As I recall, 1/2" Heliax for about $1.45 per foot, and they have the needed connectors as well. Prices on the Heliax are less than 1/2, or almost that,compared to what HRO shows for th

RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

atms169 wrote: > It's the KE5KAF Dstar system in Laredo. > 2 Meters > 120 watts after duplexers > Telawave 4 cans 600 Split > Coax LMR-400 80feet > Antenna I want to put up is a Commercial Anitron-150 Similar to a DB220 I must say I'm impressed. Which duplexer is that? How much isolation do you

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

atms169 wrote: > Well as you know, one is never satisfied with their own repeater. > Always wanting to have better! > > Yes, the Dstar system is great. I am changing the fiberglass vertical > to the Anitron-150 which is a set of folded dipoles. > > I'm running a TE Systems PA and a Chip Angle

Re: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

atms169 wrote: > It's the KE5KAF Dstar system in Laredo. > 2 Meters > 120 watts after duplexers > Telawave 4 cans 600 Split > Coax LMR-400 80feet > Antenna I want to put up is a Commercial Anitron-150 Similar to a DB220 A 2-bay folded dipole array is 3 dBd gain, not 6. So to get the same gain, you

RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

I'd change out the LMR cable for something that will not cause you possible problems later on. You've spent good money for a fine system so far, don't jeopardize its operation by "going cheap" and using LMR for the feedline. The overall best suggestion is to use at least 1/2" hardline for this app

RE: [Repeater-Builder] Re: Folded Diploles or Vertical antenna?

Shame you can only get up to 50 ft. D-Star is exciting mode and the telewave 4 can duplexer is good. I would consider something other than the LMR400 for with their dis-similar double shields it can cause noise. I would seriously consider 1/2" heliax and 80 ft will not be big investment.