[amsat-bb] curious question

[Ed Krome]

As some brilliant person once said “ best amplifier I ever bought was a chain saw”.

Ed Krome K9EK

Sent from my iPhone

> On Sep 14, 2018, at 5:21 PM, Bryan KL7CN <bryan at kl7cn.net> wrote:
> 
> 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
> to all interested persons worldwide without requiring membership. Opinions expressed
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb