[TowerTalk] wireless rotor

Jim Lux jimlux at earthlink.net
Wed Apr 10 19:49:29 EDT 2013

On 4/10/13 1:44 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?

It's not all that tough. The things don't radiate all that much, and 
putting them in a decent box with appropriate feed throughs works pretty 

I'm running the Velleman relay board into a RCS-8V and sending RS232 to 
a LDG antenna tuner.  The computer and relay board is in a regular sheet 
metal aluminum box with a SMA feed through for the WiFi antenna.  The 
relay control lines and the RS232 are both run through a filtered D sub 
connector that I happened to have, but realistically, the filter isn't 
all that great down low.

I think the saving grace is that the CPU clock frequency is 16 MHz, so 
most of the noise is well above the HF band, and in any case, none of 
the harmonics fall in ham bands.  ANd for my newer work, I'm using 
Teensy3 computers (smaller than Arduino, faster, and cheaper) which have 
a 50 MHz clock.

Granted, I'm in a suburban residential area with a fairly high hash 
level overall.

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