[amsat-bb] curious question

[Bryan KL7CN]

Well said, Greg -- to clarify my original comments:

1. Arboreal QSB is real, but...
2. It's not that significant.
3. Switching polarity helps quite a bit.

I really only notice it when operating FO-29 on passes during the height of the Spring when the leaves seem to have the most moisture.

Otherwise, it's not a general concern. But it is fun to say "Arboreal QSB".

-- bag

Bryan KL7CN/W6
Location: CM98, usually
E-Mail: bryan at KL7CN.net
Telephone/SMS: 408-836-7279

> On Sep 14, 2018, at 14:13, Greg D <ko6th.greg at gmail.com> wrote:
> 
> Hi Bob,
> 
> Trees probably do have an effect, but unlike others, I've not found it
> to be a significant problem.  At least, not one where I need to plan my
> passes around which trees might be in the way.  The only time they did
> was with AO-40, where transmitting on 70cm directly into a huge oak tree
> would have the signal bounce back and interfere with the 2.4 ghz
> downlink.  One could map out where the limbs were based on the results.
> 
> In an area of the country where shade in the summer is prized more than
> many other things, taking a chain saw to a heritage-sized oak tree in
> pursuit of a QSO just wasn't an option.  So, AO-40 contacts to the
> south-east never happened.  Then "unintended chemistry experiments in
> space" made it no longer relevant.  {sniff}  The only issue I have with
> the trees now is to keep them trimmed appropriately so they don't snag
> the antennas as they swing round.
> 
> Greg  KO6TH
> 
> 
> Bob- W7LRD wrote:
>> Hi All- Just wondering-in the real world how much attenuation is there with trees?  I am surrounded with fir trees, a huge maple tree and cedar tree, (I live in the north west).  I run  a IC-910, preamps at the cp yagis.  
>> 
>> 73 Bob W7LRD
>> 
>> Seattle
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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