Hi Ron,
700-1200 foot spacing should provide good in-band receiving capability.
SDR receivers won't work for in-band receive, you must use a traditional
transceiver such as the K3, K4HD, FTdx5000, IC-7800 etc.
Micro-arcing is caused by transmitted RF jumping a spark gap.
Any metal-to-metal joint that isn't securely bonded is a candidate
for micro-arcing.
73
Frank
W3LPL
----- Original Message -----
From: "Ron WV4P" <wv4ptn@gmail.com>
To: "Mail 10" <mail10@barefoothorse.com.au>
Cc: "160" <topband@contesting.com>
Sent: Wednesday, August 19, 2020 8:03:34 PM
Subject: Re: Topband: Rohn 25 Vertical questions.
Thanks for all the replies and willingness to share hard earned wisdom.
Tim, When you say "May cause noise" Is that on TX ? or ?
I am setting the antenna up to run the 4 parasitic elements like yours, but
it will be phase 2 as the radials for them elements will be tricky on my
very unlevel terrain.
Frank, I do anticipate the use of an inband station although it's not
likely to be utilized much I would not think. All RX will be on a mix of
Beverages, rx vertical arrays and loops 700 - 1200 foot from the TX tower.
I am a welder, but I can't foresee any safe / reliable way of attaching
anything to Rohn 25. Maybe putting lugs on each of the 5/16 bolts and
running an unbroken #6 copper up each leg and bonding together at the top.
A lot of effort for a likely minimal if any change in scores though.
Ron, WV4P
On Wed, 19 Aug 2020 at 03:56, Mail 10 <mail10@barefoothorse.com.au> wrote:
> I am planning a similar installation, using Deeco mast sections (6' x
> 10"). I have 20 of these, used of course. I don't think they have been
> manufactured for decades. Sections interface with pin and socket, with 3
> x 1/2" bolts between plates on each end.
>
> Will also be strapping across the joints, as I know what a PITA
> intermittent connections are.
>
> It will be a radiating mast with no other antennas on top, apart from a
> parallel wire for 80 m operation.
>
> Erection won't commence until at least later in Spring, as the ground is
> just so wet now, after one of the wettest years we've had.
>
> 73, Luke VK3HJ
>
> On 19/08/2020 4:06 am, Ron WV4P wrote:
> > Howdy All,
> >
> > I'm getting ready to put up a Rohn 25 Insulated Base ~1/4 wave vertical.
> > (115') and I'd like to get some advice if possible.
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> Reflector
>
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