[Lowfer] New vertical Y antenna

Mon Dec 19 20:32:51 EST 2011

Bill,
   5 OHMS !!
 Sounds like all that wire you put in the air worked out  and better than 
you expected; im guessing. How much current are you seeing into the antenna?
 I will shut down PBO for the next few days and have a look!I will get you 
some catures when I can.

 Good luck !

         Rick

----- Original Message ----- 
From: "Bill Ashlock" <ashlockw at hotmail.com>
To: <lowfer at mailman.qth.net>
Sent: Tuesday, December 20, 2011 00:35
Subject: Re: [Lowfer] New vertical Y antenna

>
> Rick and group,
>
> I finally loaded up the antenna just before dark tonight after finding yet 
> another bad connection in the RG-6 cable (now over 250ft long in order to 
> reach the final at the base of the antenna). I'm seeing just about a watt 
> of DC input power to the xmitter when I resonate the antenna by varying 
> the exciter's frequency inside the shack. With a reduction of 11 to 4 in 
> the transmitter's output transformer (Vcc = 22v), and with a little math, 
> that works out to an Rac total of approx 10 ohms. I'm using a 'test' 
> loading coil having an Rac of 5 ohms so the antenna itself has a loss of 
> only 5 ohms!
>
> Should be able to make the final tune-up of the loading coil at 185.300 in 
> the AM tomorrow... so look for my usual "Wm"s .
>
> Bill
>
> From: ashlockw at hotmail.com
> To: lowfer at mailman.qth.net
> Subject: RE: [Lowfer] New vertical Y antenna
> Date: Thu, 15 Dec 2011 14:17:07 -0500
>
>
>
>
>
>
>
> Hi Rick,
>
> Yah, the progress has been good because the weather has been above normal 
> lately... and almost no snow. Today, however, is the exception with 
> freezing rain. I'm working inside modifying the one Xmitter I have up 
> here, so it will drive a vertical. I'm starting with a 10 to 4 step-down 
> ratio on the output transformer. That's figuring approx 10 ohm Rac total 
> for the whole antenna (coil + gnd loss). The temporary loading coil I'm 
> using has #18ga (equiv) Litz on it but the final, heavier, one has #12ga 
> (equiv) Litz and wound interwoven for very low loss.
>
> Looking forward to receiving a return picture of the signal!
>
> Bill
>
>> From: smokinggun at verizon.net
>> To: lowfer at mailman.qth.net
>> Date: Thu, 15 Dec 2011 02:45:34 +0000
>> Subject: Re: [Lowfer] New vertical Y antenna
>>
>> Bill,
>>  Wow you work fast! Thats a lot of wire to put up in that short time. I
>> cant wait to see the results. I think I still have a capture or 2 from 
>> last
>> season  and my receive setup hasnt changed.
>>  Of course once you perfect the new antenna , I will bombard you with
>> questions. Not that Im giving up the loop anytime soon.Its working too 
>> well
>> for me right now.
>> BTW; thanks for the "Y" formula..
>>
>>               Rick
>>
>>
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Bill Ashlock" <ashlockw at hotmail.com>
>> To: <lowfer at mailman.qth.net>
>> Sent: Wednesday, December 14, 2011 1:36 AM
>> Subject: [Lowfer] New vertical Y antenna
>>
>>
>> >
>> > Rick and others,
>> >
>> > I'm all set to begin on-air testing of this new antenna once I install 
>> > the
>> > loading coil and transmitter at the base and run wires to it. The 
>> > capacity
>> > measurements between upper and lower "Ys" (plus fill-in wires) are
>> > complete and I'm seeing approx 400pf between them. This makes for a low
>> > Rac in the loading coil because of the relatively low inductance of 
>> > 185mh
>> > at 185.3KHz.
>> >
>> > Turned out there was quite a large-sized finge field from the top "Y" 
>> > and
>> > I had to expand the lower "Y" in order to capture a good percentage of 
>> > it.
>> > That rule of thumb saying the radius of the ground radials must be at
>> > least equal to the height of the antenna proved to be true, BUT I think
>> > this applies to a vertical WITHOUT top hat. When a top hat is used it
>> > appears the radius must be equal to the antenna height PLUS the radius 
>> > of
>> > the top hat. At any rate it will be interesting to see how the total 
>> > Rac
>> > for this antenna comes out when I apply power, but I suspect it will be
>> > very low if I have captured as much of the fringe field as capacity
>> > measurements indicate. BTW there's a formula I found for the capacity
>> > between two circular conductive planes separated by a large distance 
>> > (like
>> > 50ft) that seems to work. For Lowfer antennas it comes out approx 3 
>> > times
>> > the capacity derived from the formula that is typically given in text
>> > books for closely spaced planes not accounting for th
>> > e fringe field off to the side. It's a bit lengthy but if anyone is
>> > interested, I'll post it.
>> >
>> > Bill
>> >
>> >
>> >
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