This is exactly why I got to looking at BOGs - I lack the space in a
Northeasterly direction (Northwest too, for that matter). Mine is 220
feet, as suggested by some experiments with the resonant frequency of a
dipole laid on the ground to derive a velocity factor - a technique
suggested by K2AV.
My thinking on putting the preamp at the antenna end was that I would
improve the SNR and potentially the directivity by amplifying the
desired signal before sending it down the coax where common mode signal
pickup, to some degree, seemed inevitable. But if the preamp is
amplifying those signals as well, then I clearly need to rethink.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000 and
arcluster.reversebeacon.net, port 7000
On 3/11/2012 9:52 PM, ZR wrote:
> Very possible on your farm Mike, time to experiment I'd say.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Mike Waters"<mikewate@gmail.com>
> To: "topband"<topband@contesting.com>
> Sent: Sunday, March 11, 2012 9:19 PM
> Subject: Re: Topband: How Good is Good Enough?
>
>
>> Thanks, Carl!
>>
>> Seems to me that laying on the ground, the VF would be considerably lower,
>> and so we could shorten them.
>>
>> 73, Mike
>> www.w0btu.com
>>
>> On Sun, Mar 11, 2012 at 7:58 PM, ZR<zr@jeremy.mv.com> wrote:
>>
>>> Ive said several times that my 500' BOG's dont need a preamp. The signal
>>> level may be 5-6dB lower
>>>
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1424 / Virus Database: 2113/4865 - Release Date: 03/11/12
>>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|