----- Original Message -----
From: "Jeff DePolo" <[email protected]>
To: <[email protected]>
Sent: Wednesday, June 24, 2009 12:20 PM
Subject: RE: [Repeater-Builder] Dual Receive Antennas
>
> You can't get there from here.
>
> Trying to add the yagi to the omni using power division topside isn't
> going
> to yield easily-predictable results. You'll have all kinds of pattern
> interaction between the two, with new nulls falling in quasi-random areas
> lacking sophisticated modeling.
>
> Your best bet is to feed the yagi with an independent feedline and bring
> it
> into a dedicated receiver. Vote the two receivers, or use different PL
> tones ("PL steering"). Depending on where the yagi is mounted on the
> tower
> and its proximity to the duplexed (transmitting) antenna, you may need
> additional filtering on that line as well.
>
> How much more gain toward the "critical station" do you need over what you
> have now? Chances are you're only going to pick up a couple of dB's by
> using a yagi as compared to your existing omni assuming it's a decent
> antenna to start with. A 7-element yagi has somewhere around 10 dBd gain,
> which is probably only 4 dB or so over a good VHF omni or on par with a
> high-gain UHF omni (you didn't mention what band we're talking about).
>
> --- Jeff WN3A
>
>
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of Scott
>> Sent: Wednesday, June 24, 2009 2:08 PM
>> To: [email protected]
>> Subject: [Repeater-Builder] Dual Receive Antennas
>>
>>
>>
>> OK, I can't get this straight as to how to do it...
>>
>> one repeater, with duplexer, an omni antenna for TX and RX,
>> and a yagi added for RX in one direction to pull in a
>> critical station.
>>
>> What is the best cheapest way?
>>
>> de NA4IT
>>
>>
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 8.5.339 / Virus Database: 270.12.85/2193 - Release
>> Date: 06/24/09 06:23:00
>>
>>
>>
>
>
>
> ------------------------------------
>
>
>
> Yahoo! Groups Links
>
>
>
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