[HamWAN PSDR] Who has short clean LoS to Cougar?

Wed Oct 16 23:21:46 PDT 2013

It doesn't need to be elevated, it just needs LoS to cougar and be 
capable of housing a dish + amp for a few weeks without theft/problems.  
Weatherproofing might be as simple as the Inverted Bin Mounting System 
(IBMS(tm)).  A couple feet of feedline should be OK.  What's the loss on 
your hard line?  I think I calculated about 40% (4W) power loss in a 
35ft section of 1/2" Heliax.  Microwave transmission is not a business 
we wanna be in.  Waveguide is the only sane technique, but that's really 
expensive.

I wish the amp was smaller so that it was more convenient to use it, but 
is isn't yet.  I'm working on it.  Just unloaded the wire bonder off the 
trailer.  It'll bond up some nice microwave dies for compact high power 
amps.

--Bart

On 10/16/2013 11:10 PM, Kenny Richards wrote:
> Your not wanting much. So we need an elevated location that can also 
> house a un-weather proof amp? :-).  I need to think about this, is 
> there a reason we can't use hard line ?  I may have a 35 foot run of 
> 1/2 inch that just needs a N connector put on one end. Still not great 
> at 6ghz, but better then LM400.
>
> Sent from my iPad
>
> On Oct 16, 2013, at 10:54 PM, Bart Kus <me at bartk.us 
> <mailto:me at bartk.us>> wrote:
>
>> Good stuff!  Try to grab it from a place where we might leave a dish, 
>> and house a yet-to-be-weather-proofed amplifier.  *Short* runs of 
>> LMR400 might be OK, but the attenuation/ft is really high @ 6GHz. The 
>> amplifier looks a little like this, and it makes noise when it runs:
>>
>> <hughes_1177h-series.jpg>
>>
>> http://www.avalonamprepair.com/hughes_1177h-series.jpg
>>
>> We'll dangle a 5SHPn modem with a 20dB attenuator off the RF INPUT 
>> port, and then attach the antenna to the RF OUTPUT port.  We'll have 
>> to turn down the power on the radio to just +20dBm so as not to 
>> saturate the amplifier.  It only needs about 0dBm for full +40dBm output.
>>
>> --Bart
>>
>> On 10/16/2013 8:06 PM, Kenny Richards wrote:
>>> This picture really sucks, since it was taken free hand with my 
>>> iPhone, but it sort of give you an idea of the shot to the radio 
>>> towers.  This is taken from my front yard, the red 'dots' are the 
>>> lights on the towers to keep planes from flying into them.
>>>
>>> http://www.ku7m.net/drop/CougarRadioTowers.png
>>>
>>> It is suppose to be clear tomorrow, so I'll try to grab a better 
>>> picture in the morning.
>>>
>>> Kenny
>>>
>>>
>>>
>>>
>>> On Wed, Oct 16, 2013 at 5:32 PM, Kenny Richards <richark at gmail.com 
>>> <mailto:richark at gmail.com>> wrote:
>>>
>>>     I would be lying if I said the location wasn't a big part of why
>>>     we picked the house. :-)
>>>
>>>     Sent via radio waves!
>>>
>>>     On Oct 16, 2013, at 5:29 PM, Steve <stevewa206 at gmail.com
>>>     <mailto:stevewa206 at gmail.com>> wrote:
>>>
>>>>     Dang... Can I move into your place Kenny? :)
>>>>
>>>>     Stve N0FPF
>>>>
>>>>
>>>>
>>>>
>>>>     On Wednesday, October 16, 2013, Bart Kus wrote:
>>>>
>>>>         Got pix of the towers from your location?  When might I be
>>>>         able to come over and inspect the situation in person?
>>>>
>>>>         --Bart
>>>>
>>>>         On 10/16/2013 4:00 PM, Kenny Richards wrote:
>>>>
>>>>             I have line of sight to the radio towers on cougar.
>>>>              I'm about 3 miles as the crow flies...
>>>>
>>>>             Sent via radio waves!
>>>>
>>>>                 On Oct 16, 2013, at 1:47 PM, Bart Kus <me at bartk.us>
>>>>                 wrote:
>>>>
>>>>                 Hi all,
>>>>
>>>>                 Is there anyone on list who lives close to Cougar
>>>>                 and has a clean line of sight to it?  Issaquah
>>>>                 highlands, Sammamish plateau, etc? I'm looking for
>>>>                 a volunteer to point some equipment @ Cougar towers
>>>>                 from a nearby ground location.  We'll leave it
>>>>                 installed for 2-4 weeks to run the experiment.
>>>>
>>>>                 Oh, and the experiment has to do with scatter
>>>>                 communications, utilizing radio towers as
>>>>                 reflectors.  You'll get a 30dBi dish and a 10W 6GHz
>>>>                 amplifier for a whopping 10kW EIRP.  It'll send out
>>>>                 beacons with your callsign, and we'll try to pick
>>>>                 them up around the Puget Sound.
>>>>
>>>>                 Fun times!
>>>>
>>>>                 Let me know if you can help,
>>>>
>>>>                 --Bart
>>>>
>>>>
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>>>>
>>>>
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>>>
>>>
>>>
>>>
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