[hpsdr] Diversity experience.

[Kjell Karlsen]

Hi Hagen.

When you activate the Diversity tab, RX2 is automatically ON and in synch  
with RX1. You MUST have a separate antenna that can pick up the noise. On  
my QTH, the problematic noise is locally generated so I use the antenna  
with the highest noise level for RX2. I believe that a low mounted  
vertical antenna near the house should pick up most of the actual noise  
but that has to be tested.

Good luck!

73, Kjell



På Sat, 14 Nov 2015 15:29:39 +0100, skrev adhag at t-online.de  
<adhag at t-online.de>:

> Hi,Folks!
>
> I would like to know:
> Must I activate both Receivers for using the Diversity Option?
> Do they have to be tuned both on the same Frequency?
> I have just one Antenna System available,a tuned Dipole for every  
> Frequency I want to play with.
> If I have to activate RX1 and RX2 on the screen means to have the screen  
> full of Radio,or is it just a hidden Function in the Diversity Function?
>
> Any Information will be welcome:Hagen,DL3YCR
>
>
>
> -----Original-Nachricht-----
> Betreff: Re: [hpsdr] Diversity experience.
> Datum: 2015-11-14T10:14:06+0100
> Von: "Kjell Karlsen" <la2ni at online.no>
> An: "Robin Davies" <rdavies6 at yahoo.co.uk>,  
> "hpsdr at lists.openhpsdr.org" <hpsdr at lists.openhpsdr.org>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Robin and Gerhard.
>
> I am using a 84 meter long loop for RX1 (and TX) and a W3DZZ for RX2.  
> They
> are at 90 deg. to each other. Normally the loop picks up less noise (The
> W3DZZ has 1 dB more noise than the loop, at least on 3,7 MHz.)
>
> I can swap the two antennas and get the same results but I have to use  
> the
> loop as Reference Source in the Phasing Control panel. If I use the W3DZZ
> as reference Source, the noise attenuation is not more than 12 dB or so.
> When using the loop as reference the attenuation is>20 dB. So the antenna
> having the lowest noise should be used as Reference source.
>
> 73, Kjell
>
>
>
>
> På Sat, 14 Nov 2015 08:57:24 +0100, skrev Robin Davies
> <rdavies6 at yahoo.co.uk>:> Hi Kjell>> I've just managed to find  
> myself a second Mercury card to experiment> with diversity receive....as  
> in my small, noise ridden QTH in suburban> London I'm hoping it might  
> help me remove some of the interference that> plagues me. My guess is  
> that having a second antenna that has stronger> reception of the noise  
> signal helps the nulling process...and I wondered> what sort of  
> antenna's you were using....anything special for the second> antenna?  
> I'm thinking of an active antenna...as they seem pretty very> good at  
> picking up local noise.>> I'm still hankering after an Apollo board to  
> accompany my Hermes...and I> was wondering if you felt anyone would ever  
> get there in terms of> producing a board for sale?>> 73>> Robin Davies>  
> G7VKQ>>> On 13-Nov-2015, at 10:16 PM, Kjell Karlsen wrote:>>> ***** High  
> Performance Software Defined Radio Discussion List *****>>>> Hi all.>>>>  
> I have lately experienced how efficient the diversity is to eliminate>>  
> local noise. One month I got some very high noise on 80 meter that I>>  
> have located it to come from the ADSL line into my house. So far I  
> have>> not been able to get rid of it but when using Diversity, I am  
> able to>> suppress the noise>15 dB so that I can read stations that are  
> totally>> unreadable.>>>> But if I change the frequency up and down,  
> even only 50 Hz, the noise>> reduction is lost. But if I activate CTUNE,  
> the diversity noise>> reduction is kept even if I move to a totally  
> different frequency. I>> have not seen this mentioned before but I may  
> have missed it.>>>> I am really impressed of the diversity. It is quite  
> unbelievable how>> efficient is really is!>>>> 73, Kjell>>>>>>>> -->>  
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