[600MRG] Talking points, please for your version...

[dave.riley3]

#1, Roger AFTER... See you midnight Z on Sunday...

#2, Agree, ferrite slugs only for low power.. A variable cap. does the 
trick much easier even if only across a few turns...

#3, Here we live on miles of silica sand so radials don't do much but 
loose power.. Around here conductivity is less than .5 milliseimens per 
meter.. Further north from here is mostly granite rock = poor ground 
conductivity...
Salt water is 5000, quite a difference in real life application...

Bottom line is that I only need one piece of wire and a variable cap... 
Cheap, easy, stable in all weather and it sure works good...
The dog wire has very high voltage insulation and is suitable for 
shooting over branches with a compound bow...

TNX from DaveR @ xsh/17


On 10/11/2017 11:54 AM, Larry Molitor wrote:
> #1, as I read the "rules", it says *AFTER* 30 days so that would make 
> the start bell ring at 0001z 16Oct17 or Sunday evening local.
>
> #2, due to lack of suitable ferrite/powered iron, slug tune is very 
> very lossy. I prefer to send the RF into the ether rather than warm up 
> the ATU.
>
> A "shorted turn" if done right has very little loss and works well but 
> has limited tuning range.
>
> My solution is cheap and more efficient than any of the above. Just 
> use a tapped coil and relays to select tap. If you tap at the low end, 
> you can use cheap power relays. With 7 relays (CAT5 cable for remote 
> control) I can cover the entire 630m band with under 1.2:1 SWR at the 
> TX. This also has the advantage of built in "detune" for RX, just key 
> the relays with the PTT system.
>
> #3, few people live on a big rock. Most have poor to horrible dirt 
> under the antenna. In my yard any horizontal wire is very inefficient, 
> like the the best is 20 dB below the simple vertical. Been there, done 
> that.
>
> Alternate cheap source of fence and other wire:
>
> https://www.ebay.com/sch/iwc2carl/m.html?ssPageName=STRK%3AMEFSXS%3AMESOI&_trksid=p2053788.m1543.l2654 
>
>
> 73, Larry - W7IUV / WH2XGP
>
>
> ------------------------------------------------------------------------
> *From:* dave.riley3 <dave.riley3 at verizon.net>
> *To:* 600mrg at w7ekb.com
> *Sent:* Wednesday, October 11, 2017 8:36 AM
> *Subject:* [600MRG] Talking points, please for your version...
>
> 1. No _UTC_ rejection here so are we OK for Sunday 15th as part 97s??
>
> 2. _Inductor tuning;_  A ferrous metal slug ( powdered iron ) inside of
> the coil will lower it's resonance frequency.
>     A non-ferrous slug ( brass ) will raise the frequency.
>
> 3. _R losses_; Forget R losses... Take them or leave them...
>     If you are at sea or on a salt water shore line then a vertical
> wire/tower is #1... Salt water is the _'ground'_, perfect reference @ 
> 630m..
>     If you live on several square/cubic miles of silica or rock then
> forget lossy radial/vario versions... Ugh, too expensive both in bux and
> losses...
>     Inland favorite here @ xsh/17 is for $20 dollars worth of quality
> wire and a surplus vacuum variable cap. and you will have a high Q 
> loop ...
>     Bonus for using this loop is that you get a 'quiet' receive
> antenna, typical of loops...
>     Plus, it is effectively near free space...
>
> Here is proof of performance starter>>
> http://www.ebay.com/itm/14-AWG-Electric-Dog-Fence-Underground-Wire-45mil-LD-Polyethylene-Solid-Copper-/281660026962?var=&hash=item41943ef052:m:mDjlbixxz-1G6XuoOAHA-1A
>
> GREAT HV insulation and stranded copper...  NICE!!
>
> Gudday from Dave at xsh <mailto:Dave at xsh>/17
>
>
>
>
>
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