[600MRG] Very low halfwave dipole for 630m

[Laurence KL7 L]

This winter season I squeezed a 600m half way dipole (first 150m was straight) into just over  2 acres avg height was 20ft agl on glaciated moraine (very poor) - i was expecting low z but it turned out near 50 ohms  due to the bent ends

Now - for this location which has close in mountains in most of my favorite directions its sky wave performance to the L 48 was some avg  15dB worse than the main marconi with stations in excess on 2000kms which most are - but you have be very careful to pass absolute judgement given the iono and local topo/ground conditions stuff that goes on here. I really wasnt suprised and the dipole was turned into more radials 😄-  Ground wave was very poor too at 50 miles - again no surprises there



Laurence
Near Area 51.1 today



> On Mar 17, 2015, at 11:10, Edward R Cole <kl7uw at acsalaska.net> wrote:
> 
> Yep, no problem 10m high = 33 feet and 262m long = 860 feet.  Since a square acre is 204x204 feet one only needs about 4-1/2 acres of land (or very accommodating neighbors).
> 
> My inverted-L is 43 feet high by 122 fee long; radials are two at 50, one 70 and one 110 foot long (all could fit on a single acre of land).  How many city dwellers own an acre?  How many own 4-1/2 acres?  This is a fine idea for you farmer-hams with your back-40 hobby farm.  My 1.75ac lot is assessed at $10.6K (my Dad's 110ac farm in MI was about $150/ac for the land).
> 
> I tried out a 960-foot BOG (only a half wave long).  Noise was 20-dB less than the inverted-L and so were the signals.  Bad  idea (neighbor rolled my BOG up when he needed access to his land to do some logging).   Then I tried a shorter BOG confined to my 1-3/4 acre (no better).  So forget wires on ground for me.
> 
> I am more interested in trying some small loops or "flags" for Rx.
> 
> but my next purchase will be two new synthesizer boards ($400) for my K3 which will permit operations below 490-KHz.
> 
> 73, Ed - KL7UW
> .
> At 05:28 AM 3/17/2015, sbjohnston at aol.com wrote:
> 
>> 
>> My inverted-L antenna continues to perform well, but I came across this interesting article on using a very low halfwave dipole for operation on the 630m band:
>> 
>> https://dl.dropboxusercontent.com/u/19882028/MF/A%20full%20size%20dipole%20for%20the%20630%20m%20band.pdf
>> 
>> If ground conductivity is very low I bet one could just lay it on the ground.
>> 
>> 
>> 
>> 
>> Steve WD8DAS
>> 
>> sbjohnston at aol.com
>> http://www.wd8das.net/
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>> 
>> 
>> 
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> 
> 73, Ed - KL7UW
> http://www.kl7uw.com
>    "Kits made by KL7UW"
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