Using Diversity reception and SDR?

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  • Updated 6 months ago
So I read the manual, read through myriad posts up here but no one has clearly answered the following questions:

First, when using Diversity reception, so, two antennas hooked up to the 6700, during transmit does the second antenna get grounded so as not to damage the 6700 or do I need a filter on that antenna to protect the radio?  I would think that using full duplex would demand filter protection for the second antenna port into the radio. 

Secondly, during SO2R operation AND during transmission, does the PGXL pass the RF from the now receiving antenna port to the 6700?  Under this circumstance I'm sure you either need antennas isolated either geographically or with low power filters between the amp and 6700?

Thanks
Peter
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W2PP

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Posted 6 months ago

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K3SF

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regarding Diversity reception...
YES antennas are grounded and your are NOT operating Full Duplex

as for the second  SO2R operation,
i have no experience with PGXL
but
would gladly like to try it if you sent me one ;-))

BUT one thing i can say about using a 6600M with one slice on ANT1 and the second slice on ANT2 (aka SO2R kinda operations). If the radio detects TOO MUCH RF on an antenna input it does two things. One it cuts off transmit output power and it grounds  all SCU antenna inputs.

My experience with this happening is when i pointed my beam at my ocf and transmitted a 100 watts cw signal. The ocf is 50ft away from the beam. the 6600m went into protect mode and did indeed cutoff cw transmit power and grounded both SCU antenna inputs.

It also popped up an error message indicating that is what is happening.

it took me a few minutes ( kinda slow sometimes here) realize what was happening.

at first, i thought i broke the radio when i saw no RF output ...
BUT
then saw the error message.... another DUH moment with my 6600M ....

i was able to confirm that too much rf to the ocf by switch to a 43ft vertcial which is 200ft away from the beam....no problem there with too much RF.
(Edited)
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W2PP

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Thanks that is what I thought might be the case.  How did you reset your radio?  Did you simply clear the error and all was well? I ask because I suspect the 6700 does the same thing.
Peter
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K3SF

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IT clears itself once the high RF condition went away..

ONCE i recognized what was happening and i switched to different antenna everything operated just fine.

i do believe the 6700 will operate the same way due to two SCU's
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W2PP

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I'm still puzzling over what to do for filters and where to put them.  I THINK I need two sets of band pass filters, one for each antenna port on the back of the 6700 just don't see a way around it.  The other problem is using the Array Solutions autofilter gadget, the band data from the 6700 will only be passed to the active slice.  No way I can see to pass the unique band data from each slice to each autofilter.  Anyone else have any ideas?

You see the problems ya get with a superb radio!!
Peter
(Edited)
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Cosmos (Alan KB5CUS)

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Well I've been looking at using  RX 1 & RX 2 with home brew blocking similar to the Array & DX units with tuned stubs also on the RX antennas...For  SO2R ..    Still scratching head..  LOL
(Edited)
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KF4HR

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Connecting two antennas to the 6700 for the Diversity function, no problem-o.  What I've been ponder is, what happens if you want to use both those antennas for high power transmit (as well as Diversity reception) and the PG-XL Amp is inserted in line.  The PG-XL amp only allows for one through-connection at a time.  (Or am I overlooking something?)