[ARC5] ARC-5 T-15 Bottom Freq, Loading.

[Kenneth G. Gordon]

On 26 May 2017 at 12:56, Chris Bowne wrote:

> 
> Pad it down a little and you will be all set to light up our new band down around 472 kc when it 
> opens up!  I have a LF TU for the BC191 here that I should test out for the same purpose  What 
> will be interesting will be how we are to comply with the ERP level limit....something like a 
> command set or 375/191 into a electrically short wire antenna or vertical will probably not need 
> much throttling back , if any.  Wonder if the191will still chirp that low in frequency.

I run the 600 Meter Research Group forum, and from the info that has been repeatedly talked 
about there, even the most "efficient" reasonably-sized antenna for those frequecies 
averages well under 1% efficiency. In some case, antenna efficiencies are so low that even a 
full kW input to them will result in an ERP that is below the required level.

Calculating ERP is not all that difficult if you make some valid assumptions.

Most of those who have operated successfully on 630 meters are outputting at least 200 
watts into their "dummy load". I think the BC-191/375 and/or the ARC-5s will be well under 
that.

Ken W7EKB

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