[GreenKeys] Space diversity receive antenna

[Daniel Jones]

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.









Daniel Jones (K6YIC)
DJones at k6yic.com
http://K6YIC.com
HH Phone #11973
SKCC#28598
CCA# AC20-13565




> 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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