[Elecraft] Dual Receivers 2 different antennas Diversity receive
E.H. Russell
ehr at qrv.com
Wed Jan 29 05:40:20 EST 2020
I also get excellent results pairing a 39’ vertical with resonant dipoles and inverted vee’s spread around the yard not far away. Because of the close proximity and QRO, I have a RF protector/limiter on the vertical.
Ed / w2rf
-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Vic Rosenthal
Sent: Wednesday, January 29, 2020 12:29 AM
To: Barry <barrylazar2 at gmail.com>
Cc: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] Dual Receivers 2 different antennas Diversity receive
I notice a big increase in intelligibility of cw signals in conditions of QSB and even QRN with diversity on 40 through 10 meters (well, at least I have dim memories of 15/12/10 m).
My antennas are only about 10m apart, but one is a horizontal dipole and the other is a vertically polarized small loop (a “pixel loop”, now made by DX Engineering). The dipole is also about 5m higher than the loop.
Victor 4X6GP
> On 29 Jan 2020, at 2:09, Barry < <mailto:barrylazar2 at gmail.com> barrylazar2 at gmail.com> wrote:
>
> Frank,
> Not all of us have your backyard, like me. Using two different polarization will get you there also, And, cross polarization will enhance decoupling between the antennas.
>
> 73,
> Barry
> K3NDM
>
> ------ Original Message ------
> From: <mailto:donovanf at starpower.net> donovanf at starpower.net
> To: <mailto:elecraft at mailman.qth.net> elecraft at mailman.qth.net
> Sent: 1/28/2020 2:41:40 PM
> Subject: Re: [Elecraft] Dual Receivers 2 different antennas Diversity
> receive
>
>> I should have clarified 540 feet of separation on 160 meters, much
>> less on higher bands (e.g. 280 feet on 80, 140 feet on 40)
>>
>>
>> 73
>> Frank
>> W3LPL
>>
>> ----- Original Message -----
>>
>> From: <mailto:donovanf at starpower.net> donovanf at starpower.net
>> To: <mailto:elecraft at mailman.qth.net> elecraft at mailman.qth.net
>> Sent: Tuesday, January 28, 2020 7:38:07 PM
>> Subject: Re: [Elecraft] Dual Receivers 2 different antennas Diversity
>> receive
>>
>> 60 feet of antenna separation does not provide diversity capability.
>> Diversity depends on independent fading of received signals,
>> accomplished by at least one wavelength of spacing between two
>> identically polarized antennas or by two antennas with opposite
>> polarization. More than one wavelength of spacing will provide even
>> better diversity performance.
>>
>>
>> One wavelength of spacing requires 540 feet of spacing, almost ten
>> times more what you're proposing to use.
>>
>>
>> 73
>> Frank
>> W3LPL
>>
>>
>>
>>
>>
>> ----- Original Message -----
>>
>> From: "VernonJ" < <mailto:k2vjk at k2vjk.com> k2vjk at k2vjk.com>
>> To: <mailto:elecraft at mailman.qth.net> elecraft at mailman.qth.net
>> Sent: Tuesday, January 28, 2020 7:27:31 PM
>> Subject: [Elecraft] Dual Receivers 2 different antennas Diversity
>> receive
>>
>> My K3S has Main and Sub receivers. I would like to use Diversity
>> receive with the Main using the transmit antenna, and my Sub using a small receive loop.
>> Is there sufficient isolation on the Receive Only antenna connection
>> to protect the Sub? Antennas are 60 feet apart, and I intend to run
>> 500 watts at some point. If I need additional isolation and
>> protection, how would I do this? Thanks.
>>
>>
>>
>> --
>> Sent from: <http://elecraft.365791.n2.nabble.com/> http://elecraft.365791.n2.nabble.com/
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