RF Exposure Levels

[Edward A. Dauer]

Thanks, Bob.  I received a couple of other private replies raising the
same question, about RF exposure using an amp and an indoor antenna.  
There is an RF exposure calculator available on the ARRL’s site, or
directly at http://hintlink.com/power_density.htm.  My configuration at
100 watts is only about 1/4 of the safe maximum.  Nonetheless your caution
is appreciated and well advised - hence my posting the calculator site
here for any others who might be sitting close to their antennas.

Ted, KN1CBR


------------------------------

Message: 21
Date: Sat, 30 Jan 2016 18:48:29 -0600
From: Bob McGraw K4TAX <[hidden email]>
To: [hidden email]
Subject: Re: [Elecraft] KXAT100 "Hunting"
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=utf-8; format=flowed


Candidly, I would be more concerned about exceeding the RF Exposure
limits with this arrangement.  Perhaps the "Tuner issue" is an
indication of such.  From your description, at 100 watts you will likely
be way outside of the FCC limits of safe RF Exposure.

Now with that said, the amount of RF at the TUNE level is not such to
confuse the tuner.  However at 40+ watts the RF back into the system is
more than the system can accurately handle.  A bunch of #31 beads or #73
beads, where "bunch" = 50 pcs or more, on the feed line at the antenna
feed point and again a bunch at the radio. This may help the radio and
antenna problem associated with the auto tune routine.  You may find the
same treatment required on the DC power cable at the radio.

73
Bob, K4TAX

>------------------------------
>
>Message: 21
>Date: Sat, 30 Jan 2016 18:48:29 -0600
>From: Bob McGraw K4TAX <[hidden email]>
>To: [hidden email]
>Subject: Re: [Elecraft] KXAT100 "Hunting"
>Message-ID: <[hidden email]>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>
>Candidly, I would be more concerned about exceeding the RF Exposure
>limits with this arrangement.  Perhaps the "Tuner issue" is an
>indication of such.  From your description, at 100 watts you will likely
>be way outside of the FCC limits of safe RF Exposure.
>
>Now with that said, the amount of RF at the TUNE level is not such to
>confuse the tuner.  However at 40+ watts the RF back into the system is
>more than the system can accurately handle.  A bunch of #31 beads or #73
>beads, where "bunch" = 50 pcs or more, on the feed line at the antenna
>feed point and again a bunch at the radio. This may help the radio and
>antenna problem associated with the auto tune routine.  You may find the
>same treatment required on the DC power cable at the radio.
>
>73
>Bob, K4TAX

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

[Bill Frantz]

Me too. And I managed to work VP8SGI on 30M RTTY the first day too. (ClubLog confirmed)

73 Bill AE6JV

On 2/1/16 at 8:34 PM, [hidden email] (Ron D'Eau Claire) wrote:

> (I've always considered 100 watts out QRO, Hi).

-----------------------------------------------------------------------
Bill Frantz        | gets() remains as a monument | Periwinkle
[phone]      | to C's continuing support of | 16345 Englewood Ave
www.pwpconsult.com | buffer overruns.             | Los Gatos, CA 95032

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]