Topband: Rohn 25 Vertical questions.

[donovanf at erols.com]

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 at gmail.com> 
To: "Mail 10" <mail10 at barefoothorse.com.au> 
Cc: "160" <topband at 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 at 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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