[ICOM] 17m and preamp question

[Stephen Budensiek]

John,
   Don't know if it's fesible, but first think I'd try would be moving
the end near the power lines to another location, even if it meant
having it lower.   See if getting it away from the power lines brings
the noise down any.   Reason I asked about the AM transmitter towers,
the 706 is real bad about overloading when one is within 1/2 mile to a
mile, if it's a 50kw station.   You might try a second antenna, maybe
a 20m dipole, located as far from the power lines as possible.
Problems I've encountered, if antenna is close to a house or barn, it
will pick up florecent lights, electric fences, similar stuff real
bad.

73's de Stephen, K0SD

***********************************

On Tue, May 22, 2012 at 6:46 PM, John G. <af5cc at fidmail.com> wrote:
> Hi Steve,
>
> I am using a G5RV homebrew clone, about 30 feet high in the center.  Not
> sure how close the closest broadcast transmitter is, but it isn't real
> close, that I know.  Normal power lines run behind the property, close to
> one end of the antenna.
>
> 73 John AF5CC
>
> ----- Original Message -----
> From: "Stephen Budensiek" <kzerosd at gmail.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Tuesday, May 22, 2012 10:16 PM
> Subject: Re: [ICOM] 17m and preamp question
>
>
> John,
>   It would be helpful if you provided a little more station
> information.   What antenna(s) are you using?  How high is it?  How
> far away are the power lines?   I'm wondering how far away you are
> from the nearest AM broadcast station, what power level are they
> running?   Do you see this S8 hash with no antenna connected?  I have
> the 706Mk2, no I don't have  noise like that preamp on vs off, with a
> G5RV, 6BTV vertical, or in the car on a mobile antenna with the engine
> off and away from power lines.  Almost sounds like you're having
> front-end overload from a local transmitter somewhere.  I've worked
> about 160 countries mobile from the car with the 706, cw and phone.
>
> 73's de Stephen, K0SD
>
> *************************************
>
> On Tue, May 22, 2012 at 2:54 PM, John G. <af5cc at fidmail.com> wrote:
>> I am trying to determine if what I am hearing is typical atmospheric
>> noise, of if I have a line noise problem of sorts. Here is my situation:
>>
>> I have an Icom 706 original model. I find that all three models of theh
>> 706 are too sensitive on 20m and below with the preamp on-you get to
>> listen to a S8 noise or so most of the time. So I leave the preamp off on
>> those bands, and on 30m and below it seems just right on the original
>> model-you see an S1 or so noise level on those bands. On 20m it is
>> probably a little deaf with the preamp off, but works fine. On 15m and
>> above I turn on the preamp and it seems just right.
>>
>> So what is people's experience on 17m? With the preamp on I see around a
>> S7 or so noise level. WIth it off, it seems to lack a little sensitivity
>> on that band. I did work V85SS on 17m yesterday so I can hear stuff with
>> the noise that my rig is getting, but it is also tiring ot listen to,
>> especially if it is something that can be fixed. So, with your 706 (any
>> model) on 17m, what sort of background noise level are you seeing with the
>> preamp on?
>>
>> 73 John AF5CC
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html