[Lowfer] Wm beacon testing tonight @ JAY

[Charlie , W5COV]

Jay,

Just curious if you have run similar tests on conductors for say a 
nominally 50 foot vertical ?

Also is 1/4" Litz available commercially ? I know it would be expensive, 
but most of us didn't get into this hobby because it was cheap. <grin>

Just curious if it was commercially available, or if perhaps someone had 
built their own version of a Litz type wire conductor. Part 15, even one 
additional dB can make all of the difference in the world of being seen 
or not.

Although I know one can get on the air these days with a fairly decent 
regular ham station by building or even buying some older gear for under 
$100.

Thanks,

Charlie, W5COV

On 11/18/2014 12:56 PM, N8OOU wrote:
> Jay, Thanks for the operating info gathered from your previous tests. 
> I will take it into consideration in my future builds. I don't 
> consider your input a wet blanket, as I have no mileposts to judge 
> forward or backward progress.
>
> Implementing a large transmitting loop here is well within reason, but 
> other less controversial designs can easily be accommodated too.  I 
> want the station to operate as close as possible to the level of it's 
> previous operator, but it must do so within my comfort level.  That's 
> a major component in the beacon testing I am doing now.
>
>
> 73   de   N8OOU - Mike Meek
>
> On 11/18/2014 09:56 AM, jrusgrove at comcast.net wrote:
>> Mike
>>
>> Dug out my antenna notes on lowfer VD from many years ago. The antenna
>> was 200' perimeter. The loop conductor was milspec RG-11 (excellent
>> braid) using the outer braid as the loop conductor. Since the antenna
>> could be raised and lowered with relative ease I also made measurements
>> on 200' perimeter loops made from #12 and #8 copper wire to see how they
>> performed. Analysis was based on measured antenna current which gives an
>> accurate indication of antenna Rtotal. The Rtotals can then be compared
>> to predict the dB difference between the antenna conductors. I also made
>> some calculations based on other antenna conductors. RG-11 is the
>> reference conductor at 0 dB.
>>
>> 1/4" Litz......................+1.3 dB
>> 7/8" Heliax.................+ 0.9 dB
>> 1/2" Copper tubing.....+0.4 dB
>> RG-11............................0 dB
>> #8 Copper.................-2.4 dB
>> #12 Copper...............-3.8 dB
>>
>> You're #16 loop conductor is going to be even further down the list ...
>> that plus the fact your antenna area is less than that of a 200'
>> perimeter are going to make this a challenge. Keep in mind that on an
>> Argo display a 1 dB difference in received signal level can mean the
>> difference between barely visible and solid white line reception. Not
>> trying to throw a wet blanket on your efforts ... just giving you an
>> idea what to expect and what's possible.
>>
>> Jay W1VD  WD2XNS  WE2XGR/2
>>
>>
>>
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