> "Admin" <[EMAIL PROTECTED]> wrote:
> i picked up a workman uvs-300 for $55 , its the
> same antenna as the diamond XMa-510 , 11.3
> db on 440 and 8.5 db on 144 , and so far we have
> thrown up to 50 watts uhf into it and have
> worked 440 machines about 100 miles away
Have you checked the bandwidth of the antenna? The
Fc of the last Diamond DB ant I checked was about
446.3Mhz. The reflected power at 440.000 was in
excess of 2:1 Our Repeater Tx's are on the low
side of the band.
2:1 is not a value we choose to use for a repeater
Tx antenna.
> we have a GE progress line uhf repeater ,
> and it had a bad TX strip , it puts out about
> 3/4 to 1 watt into a phelps dodge duplexer
This is a recipe for big time trouble...
> ..and well that eats power , and still feeding the antenna
> with the same rg 58 , the output after the cans is
> milliwatts ,and feed milliwatts through rg 58 , i know
> stupid , that repeater with that uvs 300 antenna , has
> a 9 mile talk range to mobles in the hills and
> base radios at almost 12 miles , on milliwatts.
Most people are surprised to learn how well small amounts
of power work. When Taxi cab company rf power amplifiers
fail, I'd often run them on the 150mW exciter for a day. From a
large building or nearby mountain top, 10 mile radius temp
coverage was pretty easy.
> I recomend this dual band base antenna to anyone, I
> know it hasn't had a popular review , but I still bought
> one and it has out done any antenna i have built or
> purchased hands down, so if your looking for range
> on a low power setup, this is a way to go.
> Workman UVS -300
> 200 Watt Capicity
> 239 mount , not an N unfortunately
> 17.6 ft tall 3 piece fibre glass
> adjustable ground plain sleeve
>
> I hope this will help in anyone's ideas for repeater
> or base antenna
> Russ
> N3TIH
If you have a chance to measure the antenna bandwidth,
report back with your results. We're always interested
in other antenna options.
Cheers,
skipp
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
