That is surprising, can the SteppIR designs be used for legal limit RTTY?
John KK9A
Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.
On Thu, Dec 7, 2017 at 9:52 AM, Keith Dutson <kdutson@sbcglobal.net> wrote:
> That sounds reasonable. You might want to contact SteppIR to help detect
> the problem.
>
>
>
> I was using a vertical antenna rated for 1500 watts, but it failed using
> 1500 watts AM on 80 meters. SWR went very high causing amp (Alpha 87A) to
> fault. Manufacturer said it would not handle AM, only PEP. So much for my
> demonstration to a friend. <grin>
>
>
>
> *73, Keith NM5G*
>
>
>
> *From:* turnbull [mailto:turnbull@net1.ie]
> *Sent:* Thursday, December 7, 2017 2:07 AM
> *To:* Keith Dutson <kdutson@sbcglobal.net>; john@kk9a.com;
> towertalk@contesting.com
> *Subject:* RE: [TowerTalk] BigIR question
>
>
>
> Starts at about 1.2 and heads for 2 to 1. The BE is maybe 20 kHz. This
> is a Hi Q device when using the loading coil. 73 Doug EI2CN
>
>
>
>
>
>
>
> Sent from my Samsung Galaxy smartphone.
>
>
>
> -------- Original message --------
>
> From: Keith Dutson <kdutson@sbcglobal.net>
>
> Date: 07/12/2017 00:58 (GMT+00:00)
>
> To: 'Doug Turnbull' <turnbull@net1.ie>, john@kk9a.com,
> towertalk@contesting.com
>
> Subject: RE: [TowerTalk] BigIR question
>
>
>
> What is your SWR on 80?
>
> Keith NM5G
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com
> <towertalk-bounces@contesting.com>] On Behalf Of Doug
> Turnbull
> Sent: Wednesday, December 6, 2017 9:56 AM
> To: john@kk9a.com; towertalk@contesting.com
> Subject: Re: [TowerTalk] BigIR question
>
> Dear OMs and YLs,
> I have a BigIR mounted on an extensive radial field and also with the
> 80/60M loading coil. In contests, I am allowed to run 1500W - I find
> that
> on 80M the antenna does not stay in tune while transmitting for a while and
> assume this is to do with heating but am not sure. Normally I would not
> operate with more than 500 W for a contest on 80M then there is no problem.
> On 40M to 10M there is no such problem.
>
> This is not my prime antenna but is a useful fallback. It is an
> excellent vertical.
>
> 73 Doug EI2CN
>
> PS Only in contests are we allowed this higher power level.
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com
> <towertalk-bounces@contesting.com>] On Behalf Of
> john@kk9a.com
> Sent: 06 December 2017 12:23
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] BigIR question
>
> This is a much better antenna than the fixed height 43' vertical that is so
> popular.
>
> John KK9A
>
>
> To: Frank VO1HP <invl160@gmail.com>
> Subject: Re: [TowerTalk] BigIR question
> From: Ed Richardson <ed_richardson@shaw.ca>
> Date: Tue, 5 Dec 2017 19:44:07 -1000
>
> Jim. The bigIR can be tuned to a quarter wave on all frequencies from 7 to
> 54 MHZ. On frequencies from 21-54 MHz you can select a 3/4 wavelength mode.
>
> I have used this antenna with raised radials, tuned stub radials and a
> ground mounted radial field. Works well in all cases. It is still a
> quarter wave vertical.
> No magic
>
> Ed. Ve4ear
>
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