[600MRG] My TXing experience on 630m

[Ed Cole]

If I can get the 80/40m dipole hung this winter, it might work for 
receiving (without ground plane).  Loading will be shifted due to 
different design and ground conditions (120-foot away from previous 
site).  The vertical will be two runs of RG-8 spaced 3-inch to make 
300-ohm open wire feed to the dipoles and shorted to become vertical-Tee 
on 630 & 160m.

My original plan was placing the 600m NDB xmtr at the base coil, but now 
looks simpler to have xmtr at the shack so one coax line will serve as 
feed.  A vacuum relay will be used to short loading coil turns for the 
160m tap (and be open for 630m).  Coax is connected 2-1/2 turns from 
ground end of the base loading coil to present 50-ohm for the coax.

I can run 100w output into the coax on 630m and up to 1200w on 160m 
(when I complete the amplifier - MRF-1K50H from W6PQL).  Switching 
feedline easier at the shack.  The Inv-L calculated 4% EIRP for 4w, so 
expect the Tee to be similar efficiency (unknown until I test using 
MFJ-269D with radials next spring).  Inv-L tested R=20 ohms; radiation R 
calculated 0.8, so eff= 0.8/20 = 0.04

80/40m will be fed thru 4:1 balun at ground end of the open wire and 
also be capable of 1200w.

73, Ed - KL7UW

On 1/9/2023 9:49 AM, Ed Cole wrote:
> Neil,
> 
> Impressive with 1mw!
> 
> My 80/40m dipole was pulled down when my 40-foot tower crashed in August 
> (It held two 7-element 6m yagis).
> 
> Time got away from me before snow fell on Oct.26 making lawn unusable 
> with a man-lift to raise wires.  Also did not get ground radial wires lain.
> 
> Might get a pulley & haul rope installed at 40-foot, if I can get tower 
> climbers to raise some VHF & UHF antennas.  I still have my 10-inch 
> diameter loading coil from when I had a 43 by 120 -foot Inv-L.  New 
> antenna will be 40-foot vertical-Tee, with dipoles acting as top-hat 
> loads.  Will be about the same amount of wire as the Inv-L.  I estimate 
> 4w EIRP.
> 
> 73 & HNY, Ed - KL7UW
> 
> On 1/9/2023 9:18 AM, Neil Klagge wrote:
>> Hi all, from Neil Klagge, w0yse
>>
>> I have been gratified on the success of my recent transmissions on 
>> 630m.  I never thought I would be able to TX on the band after moving 
>> to my present location which is an HOA community. Our 'land' is only 
>> the ground under our condo pad and the inside walls, etc. We have NO 
>> yard, and there are NO trees available for a stealth wire.  I have put 
>> up a wire over the peak of one edge of our roof. I call it my 
>> 'Inverted LV' because the wire is fed at ground level, goes up 10 feet 
>> to the lower edge of the roof. Then, the top wire of 30 feet goes up 
>> and over an 18ft peak and down the other side.
>>
>> My loading coil is wound on a one-inch PVC pipe and is about 1 foot 
>> long with a core of ferrite rods, a suggestion I got from Rik, ON7YD.
>>
>> So far my WSPR beacon has been decoded in New Mexico by KM5SW at 480 
>> miles and in Arizona by W7LUX at 405 miles.  My CW beacon was heard 
>> near Atlanta Georgia by Tom, W8JI who has some very long beverages. 
>> Tom is 1630 miles from my QTH.
>>
>> The power into the coax is about 5 watts. My estimated EIRP is about 1 
>> milliwatt, much of that being absorbed by the roof shingles. It seems 
>> impossible that I should be heard at all.
>>
>> So, for all those out there with severe limitations, IT IS POSSIBLE to 
>> TX on 630m. I hope my experience has stirred up some hope and interest 
>> for this band.
>>
>> 73, and thanks for the 'bandwidth'
>>
>>> **
>>>> **´¨)
>>>> ¸.•´¸.•*´¨) ¸.•*¨)
>>>> (¸.•´ (¸.•`   Neil *, wØyse, DN41ah, North Ogden, Utah 84414
>>
>> My ham radio website: http://w0yse.webs.com/ <http://w0yse.webs.com/>
>> <http://wg2xsv.webs.com>
>> My Faith website: http://neilsfaith.webs.com/ 
>> <http://neilsfaith.webs.com/>
>>
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