The noise I hear from it when sniffing is from the USB cable, not from the
GH unit specifically. I put ferrites on both ends of the USB just as a
precaution anyway.
The presence of a uP near the antenna does not necessary indicate trouble.
And a lot of those uP units will have a sleep state setting as part of the
hardware which is enabled by the firmware. So the device wakes up when
tickled by some input (like a RX flag) - or at a periodic time interval. It
really depends on the implementation for that unit.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Les Kalmus
Sent: Wednesday, April 10, 2013 4:01 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] wireless rotor
None that I can hear.
Les W2LK
On 4/10/2013 4:44 PM, Jack Brindle wrote:
Maybe.
Putting a major noise source (micro controller with lots of high-speed
clocks) right at the single most important quiet area might not be that
good of an idea. Adding chokes and bypass caps to knock down the noise can
only go so far. I'd rather not have the noise generator at the antenna in
any case.
Which brings up the question, what kind of birdies and noise does the
Green Heron and similar devices add?
Jack B.
On Apr 10, 2013, at 7:06 AM, Jim Lux <jimlux@earthlink.net> wrote:
On 4/10/13 6:38 AM, Charles Lind wrote:
I've been using Green Heron Everywhere for three years to control a
rotor
and switching for five antennas with no failures or downtime. Saves a
lots
of expensive cable, the groundhogs can't eat the wireless signal, and if
something were to go wrong, I wouldn't have to dig up 400 feet of cable.
Chuck, N8CL
this really is how hams should be heading.. with cheap wireless
interfaces, Arduinos with 802.11 or Zigbee, etc.
There's a nice $50 relay board from Velleman (K8056) that has 8 SPST
relays on it and can be controlled by RS232, TTL serial, discrete 8 bits,
or a RF receiver module. They also have 16 and 4 relay boards.
THere's probably a ton of things from SparkFun that stick right onto a
Arduino.
There's even a new Ethernet Relay card from Velleman
http://www.velleman.eu/products/view/?id=407510
$150 on Amazon.. Pretty slick.
There's a Arduino with Ethernet built in and lots of example programs out
there to do basic control stuff (or complex control stuff).
It won't be long before someone builds an open source rotator controller
using an Arduino and H bridge or relay board. They're cheap, easy to
learn to program (either in C using free tools, or in the sort of C-like
Arduino IDE) and plenty smart enough to run a control loop for a rotator.
Get yourself a nice WiFi bridge (I like using the 5 GHz band so I don't
have to fight all the 2.4 GHz stuff) and you're done.
And, hey, it uses *radio*... we can move beyond wired telegraphy to,
gosh, wireless.
(I will happily buy a beverage of choice for the first person who
controls their antenna with a spark gap transmitter and coherer, though.
Very steampunk..)
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