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Re: [TowerTalk] station to station interference-with obtuse power levels

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Subject: Re: [TowerTalk] station to station interference-with obtuse power levels
From: "Mike Smith VE9AA" <ve9aa@nbnet.nb.ca>
Date: Fri, 30 Sep 2016 17:54:20 -0300
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I don't have much respect for folks who break the law and then state it in a
public forum.(here and 3830scores)

 

http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01226.html#p10

 

 

10.2 Amateur Radio Operator Certificate with Advanced Qualification

 

The holder of an Amateur Radio Operator Certificate with Advanced
Qualification is limited to a maximum transmitting power of:

(a) where expressed as direct-current input power, 1,000 W to the anode or
collector circuit of the transmitter stage that supplies radio frequency
energy to the antenna; or

(b) where expressed as radio frequency output power measured across an
impedance-matched load, (i) 2,250 W peak envelope power for transmitters
that produce any type of single sideband emission, or

(ii) 750 W carrier power for transmitters that produce any other type of
emission.

 

 

Thanks for bringing all VE's down a notch in the eyes of the world.

 

Visiting ops are forgiven, but the guys from Ontario should've really known
better.

 

Mike VE9AA

 

 

Some fresh observations from CQ WW RTTY.

 

At VC3S we entered M/S HP, using two radios with two amps, each amp running 

under 1500W.

 

Our antennas were a tribander for 20 thru 10, a yagi for 40, inv.-V for 80,
and 

an OCF for 40 thru 10.  All antennas were on the same 95' tower.

 

The tribander was fed using a VA6AM designed triplexer and HP filters. Since


the triplexer is rated for 3 kw we kept each amp at under 1500W.

 

Each radio also had automatic bandpass filters from Array
Solutions/Hamation. 

The goal of these filters was to 1) filter out any residual RFI that leaks
in 

thru the SO2R antenna switch or other means and 2) clean up the radio output
so 

that the amp does not amplify any RFI.

 

The end result was absolutely no interference between the two radios. Note
that 

one of the radios was an Icom 7300 which would illuminate the overload 

indicator if there is ADC overload (even if we humans think the radio is not


overloaded); we never saw the indicator illuminated.

 

Conclusion- filters are very effective in dealing with heavy RFI, including
the 

extreme situation where two radios share the same antenna at the same time.

 

Rudy N2WQ

 

Mike, Coreen & Corey

Keswick Ridge, NB

 

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