[K4RY] iGate and Digipeater up and running for K4RY

[Zebediah Whitehead]

Thanks all!  I gathered all the info and put it up on the wiki (http://wiki.eng.auburn.edu/k4ry)
Look for it under the equipment section.

Thanks,
Zeb

> On Jul 31, 2014, at 6:44 PM, "Kris Kirby" <kris at catonic.us> wrote:
> 
>> On Thu, 31 Jul 2014, John Hung wrote:
>> Vertex (Yaesu) VXR-5500.  John Hung
> 
>>>> On Thu, 31 Jul 2014, John Hung wrote:
>>>> The 2-m repeater is the Yaesu FTR-2410 I believe. I have a PDF of the 
>>>> manual on my office computer. You're right, the 444.80 has gone deaf 
>>>> for me as well. Another item to check out.
> 
> Y'all may consider installing a shorted 1/4-wave stub on each 
> single-band radio station. It will prevent precipitation static and 
> couple static fields to ground. I'd recommend checking them across a 
> large temperature range before committing them to the installation. 
> Don't forget to factor for velocity factor, and use attenuators between 
> a MFJ analyzer and the stub. The MFJ is prone to VCO pulling as a result 
> of a changing load impedance. 
> 
> Lightning doesn't like to make abrupt changes or angles, so coils of 
> coax (held together with Velcro, not tie-wraps (causes discontinuities in 
> impedance at those locations)) form HF chokes.
> 
> Lightning behaves like a large square-wave DC pulse with many harmonics 
> up into the megahertz. I live near several 1,000 ft towers, and watching 
> a storm on a HP-141T (analog) spectrum analyzer is amazing and 
> enlightening. You can scan the whole range from 100 KHz to 1250 MHz in a 
> single sweep and see the effective environmental low-pass filter. 
> 
> If you're colocating repeaters or VHF/UHF stations with a HF station, 
> make liberal use of ferrites for chokes and put loops in the coax to act 
> as chokes as well. But remember, take a direct path to the central 
> grounding block or panel -- you have to encourage lightning to go where 
> it is best handled, not where it might want to visit. 
> 
> It also helps if the antennas a DC-shorts like the DB-224 and DB-420. 
> The DB antennas also have the advantage that the antenna is attached to 
> the mast, but the mast is conductive aluminum. If the mast is properly 
> bonded, most of the lightning current should pass down the mast into the 
> support structure and/or grounding system. Of course, aluminum and 
> copper do not combine very well for very long. (Never use galvanizing 
> spray on copper wire! I learned that one the hard way!) 
> 
> --
> Kris Kirby, KE4AHR
> Disinformation Architect
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