Topband: BOG

[Herbert Schoenbohm]

If the far end is left un-terminated the BOG will not work well as I 
have found here. Try a small ground rod of 4 feet and a 250 ohm resistor 
and sweep again.  I predict your results will be much better.


On 10/16/2016 7:15 PM, Lloyd - N9LB wrote:
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>
> Hello Tony!
>
> Ground conditions and wire height above ground make a huge difference in
> best length.
>
> I found the optimum for my BOG, using WD-1A wire and operating at 1825 KHz,
> at my QTH is 290 feet.
>
> 73
>
> Lloyd - N9LB
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of N2TK,
> Tony
> Sent: Sunday, October 16, 2016 5:15 PM
> To: topband at contesting.com
> Subject: Topband: BOG
>
> Stretched out 200' of WD-1A along a stone wall. Kept it about 2" above the
> ground and right up against the stones. Fed it with a 300 ohm secondary
> transformer and left the far end unterminated.
>
> Used the MFJ-259 to sweep the bands starting at 1.67 MHZ.  Saw on K1FZ notes
> that to find the best single wire length for 160M is to sweep the bands and
> check where the SWR goes to a low value and stays there.
>
> I couldn't find that frequency. I get dips at
>
> 2.58 MHZ 4.3:1
> 3.36 MHZ 1.5:1
> 4.39 MHZ 1.4:1
> 6.033 MHZ 1.3:1
> 9.807 MHZ 1.2:1
>   
> I didn't check any higher in freq. I only care about listening on 160M with
> it.
> I twisted both wires together at the feedpoint.
> Want to check it out first as a single ended BOG to see how it works before
> I go to the trouble of making it a two direction BOG.
> At one point the BOG is only 35' from my tower.
> Is it too high and does it need to be against the ground?
>
> Any feedback appreciated.
>
> N2TK, Tony
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