[time-nuts] BPSK Receiver & GPS Antenna siting

[Bob Camp]

Hi

Legal or not, that's the way the titles are all written around here. The
logic is "visual pollution". You are fine displaying the flag. It's the free
standing pole they prohibit.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bill Dailey
Sent: Friday, September 28, 2012 10:32 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] BPSK Receiver & GPS Antenna siting

I don't think it is legal to prohibit flag poles

Sent from my iPhone and Hunter Lambert is my hero!

On Sep 28, 2012, at 8:16 AM, "Bob Camp" <lists at rtty.us> wrote:

> Hi
> 
> Flag poles are prohibited.
> 
> Bob
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Randy D. Hunt
> Sent: Thursday, September 27, 2012 10:24 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] BPSK Receiver & GPS Antenna siting
> 
> On 9/27/2012 4:20 PM, Bob Camp wrote:
>> Hi
>> 
>> At least in my back yard, a 6' tall tripod would be very noticeable from
a
> number of directions. There are many others in similar situations. If I
were
> to interpret the restrictions literally as written, an antenna that was
> inside the house, but visible through an open window is also a violation.
>> 
>> Bob
>> 
>> 
>> On Sep 27, 2012, at 7:11 PM, johncroos at aol.com wrote:
>> 
>>> Various comments -
>>> 
>>> Hal mentioned SNR for the scheme I suggested. A PLL can be a coherent
> demodulator of arbitrary
>>> bandwidth. Thus the PLL at the output of the doubler can have a small
> bandwidth since at that point
>>> there is no PSK, it having been removed by the doubler. So given a
stable
> VCXO you can probably get down
>>> to 1 Hz and thereby achieve a good SNR. There is a lot of stuff out
there
> on phase tracking receivers
>>> that do exactly that. You know the frequency so the loop does not have
to
> search far and the BW can be increased
>>> for acquisition and closed up for tracking.
>>> 
>>> On writing reams of code - my point was that it is not required to used
> the admittedly more powerful software
>>> techniques to do this job - I noted that one reason to write reams of
> code is for the fun of it, this is after all
>>> a hobby.
>>> 
>>> GPS Antenna Siting -
>>> 
>>> Lets not make this so hard. Mine is at 6 ft elevation and is blocked to
> an elevation angle of 20 to 30 degrees by a house
>>> within 15 ft and a forest of trees. I have room and no restrictions but
I
> also have severe thunderstorms - so the house
>>> plays lightning protect for the antenna. My T bolt tracks a Rb to better
> than 1e-12 over 24  hours with no serious 10 MHz phase bumps
>>> as plotted on a  strip chart recorder.
>>> 
>>> Sooooo  -
>>> 
>>> Put your antenna at 6 ft in back yard. Start out on a photo tripod - who
> is gonna notice?
>>> set up a t bolt at EL=5 AMU=0 Damping = 1.2 and Time Constant = 100 sec.
>>> get the t bolt manual
>>> get Tbolt monitor
>>> get Lady Heather and read all that stuff.
>>> 
>>> Run Lady Heather antenna survey (command SAS)  for at least two days -
> you get a map of signal level in dBc vs elevation
>>> Reset the Tbolt elevation mask to reject anything that is shown as
> blocked using the signal
>>> level map. Likewise experiment with the AMU setting to reject the weak =
> poor signals. Mine works good
>>> with AMU all the way up to 10 as fewer good satellites are better than
> lots of weak ones.
>>> 
>>> The satellites are in high orbits so masking those below 25 degrees is
OK
> and the AMU sets the acceptable signal
>>> level - at AMU 10 my setup throws out those below about 40 dBc - the
> strong guys go up to 50. This is a function
>>> of you antenna performance so some experimentation is required.
>>> 
>>> -73 john k6iql
>>> 
>>> 
>>> 
>>> 
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>> 
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>> 
> Put up a flagpole.
> 
> Randy, KI6WAS
> 
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