[K4RY] iGate and Digipeater up and running for K4RY

[Zebediah Whitehead]

Also for and alternative location for the aprs igate and digipeater...  I remembered that we (ens) still have some outdoor wifi ap's located on top of Davis hall (aerospace) that are currently decommissioned. 
We could locate transmitter and computer in the lower maintenance room. Then run the coax to the rooftop masts and mount the antenna. 
This would provide a air conditioned, AC powered, secure area, with little rf interference, and a little higher in elevation than broun hall. 

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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