I had an arx270 to slowly burn the cap out @ the feed point of the antenna.
They will not handle 100 watts @ feed point on continuous duty. I contacted
Cushcraft and they sent me a new cap at no charge. I use it home now, no
repeater use. Bruce, KD4BOH.
----- Original Message -----
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, May 12, 2005 3:41 PM
Subject: Re: [Repeater-Builder] Repeater Desense
> Bob,
>
> The most recent instance was with a Cushcraft ARX-270 2m/440 antenna. I
> watched this antenna being assembled, and I can state that there was no
> corrosion, maladjustment, or looseness involved. We used that antenna
> briefly
> for a 2m repeater simply because it was already in place, and we had a
> special
> event to cover. A Motorola RKR-1225 repeater was hooked to it using
> LDF2-50
> Heliax feedline. When the Cushcraft antenna wouldn't work without major
> desense, I swapped it for a Sinclair SRL-222 dipole, which worked
> perfectly.
>
> 73, Eric Lemmon WB6FLY
>
> Bob Dengler wrote:
>
>> At 5/12/2005 12:37 PM, you wrote:
>> >Yes. Many repeater receivers are simply not well enough shielded to
>> >keep the TX from leaking into the RX box. Even some commercial
>> >repeaters will suffer desense if 100% shielded feedline is not used. I
>> >have seen serious desense occur when a dual-band (2m/440) antenna is
>> >used on a repeater, due to the uneven gain versus frequency response of
>> >many such antennas.
>>
>> A narrowband antenna by itself will not generate desense. Your problem
>> was
>> probably due to corrosion, dielectric breakdown, or some other cause
>> related to poor construction/materials in the amateur grade antenna.
>>
>> I would like to know what model antenna this was though, since I have yet
>> to see any desense problems with my Comet antennas.
>>
>> Bob NO6B
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
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/
