[GreenKeys] Space diversity receive antenna

[Harold Hallikainen]

Thanks for the comments! I agree that setting up two receivers can be a
pain (and I don't have two receivers). That's why I'm thinking of just an
anteanna switch in front of the transceiver.

Harold
https://w6iwi.org


On Sat, January 4, 2025 11:18 am, Daniel Jones wrote:
> I have used diversity with my URA-17 set (CV-483).  I will have them
> hooked up to an EAST-WEST and NORTH-SOUTH End Fed setup.
>
> I find that the fading goes away when receiving signals from around me but
> sometimes setting up the multiple receivers can be a pain.
>
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> Daniel Jones (K6YIC)
> DJones at k6yic.com
> http://K6YIC.com
> HH Phone #11973
> SKCC#28598
> CCA# AC20-13565
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>
> 
>
>> On Jan 4, 2025, at 10:08, Nick England <navy.radio at gmail.com> wrote:
>>
>> Larry W1SIM regularly uses space diversity reception on our Saturday
>> morning 40m 850 shift RATT net.
>> He gets very good results using a vertical and a horizontal antenna and
>> often comments about watching the strength shift between the two.
>> I think he uses a pair of ST-8000A TUs for this.
>>
>> Nick England K4NYW
>> www.navy-radio.com <http://www.navy-radio.com/>
>>
>>
>> On Sat, Jan 4, 2025 at 12:30 PM Harold Hallikainen via GreenKeys
>> <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> wrote:
>>> I'm really having a problem with QSB. A received signal (20 meters)
>>> goes
>>> from great to down in the noise over several seconds. As an experiment,
>>> I
>>> transmitted both mark and space tones from here in Tucson AZ and
>>> received
>>> them on the KFS SDR in Half Moon Bay CA. I then ran the recorded audio
>>> into the DSP TU and output the levels of the mark and space filters.
>>> The
>>> results are at
>>> https://w6iwi.org/script/csvgraph.html?CsvUrl=https%3A%2F%2Fw6iwi.org%2Frtty%2FTuNotes%2Fms220517a.csv
>>> .
>>>
>>> This reminds me of a TV station where I lived in San Luis Obispo CA
>>> that
>>> had a long microwave feed. They put two receive dishes on their tower
>>> and
>>> had a carrier operated relay in the receiver start a slow astable
>>> multivibrator that switched the receiver input between the two receive
>>> dishes. The switching would stop when a good signal became present.
>>>
>>> So, how about applying this to RTTY? I am using a 30 foot vertical for
>>> transmit and receive. I could put up a 20 meters dipole about 50 feet
>>> away. During receive, I could switch between these two antennae.
>>>
>>> Is this worth trying? I could use signal strength indicated by the
>>> receiver. Or I could use something from the terminal unit (such as
>>> switch
>>> during mark hold).
>>>
>>> Is anyone using space diversity? Comments?
>>>
>>> Thanks!
>>>
>>> Harold
>>> https://w6iwi.org <https://w6iwi.org/>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Not sent from an iPhone.
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