Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old October 8th 17, 12:29 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Oct 2017
Posts: 1
Default Active Antennae?

While looking for a does it all antennae for my Kenwood R5000 receiver
(with the 108-174 MHz option) I came across this website:

http://www.g8jnj.net/activeantennas.htm

The Clifton Labs Active monopole is of particular interest to me as he
says "This circuit seems to work very well, and has an extremely flat
frequency response from about 10KHz upto 180MHz." That would cover the
whole range of my receiver.

Anyone have any experience of this, or any other active antennae? I'd
rather build one than buy one, anyone got any designs they can recommend?

Thx.
  #2   Report Post  
Old October 10th 17, 11:30 AM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Sep 2013
Posts: 62
Default Active Antennae?

On 10/08/2017 07:29 AM, Burt Evans wrote:
While looking for a does it all antennae for my Kenwood R5000 receiver
(with the 108-174 MHz option) I came across this website:

http://www.g8jnj.net/activeantennas.htm

The Clifton Labs Active monopole is of particular interest to me as he
says "This circuit seems to work very well, and has an extremely flat
frequency response from about 10KHz upto 180MHz." That would cover the
whole range of my receiver.

Anyone have any experience of this, or any other active antennae? I'd
rather build one than buy one, anyone got any designs they can recommend?

Thx.


Hello, and basically an "active" antenna pairs a preamp with an antenna.
This is the same as considering a satellite receiving dish + LNA as
"the antenna". The problem here is that unless you can improve the S/N
at the RF input terminals of your receiver, you won't accomplish
anything. Things might even be worse with the active antenna. It boils
down to the amount of excess noise introduced by the receiver and the
excess noise introduced by the preamp. A lossy (at the frequency(s) of
interest) cable run between the active antenna and receiver input will
also degrade S/N performance.

The linearity (distortion performance) of the preamp is also important,
especially if the active antenna is exposed to strong non-signals of
interest at its input absent any preselection filtering. Sincerely, and
73s from N4GGO,

--
J. B. Wood e-mail:
  #3   Report Post  
Old October 31st 17, 12:00 AM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Aug 2013
Posts: 154
Default Active Antennae?

On 10/8/2017 6:29 AM, Burt Evans wrote:
While looking for a does it all antennae for my Kenwood R5000 receiver
(with the 108-174 MHz option) I came across this website:

http://www.g8jnj.net/activeantennas.htm

The Clifton Labs Active monopole is of particular interest to me as he
says "This circuit seems to work very well, and has an extremely flat
frequency response from about 10KHz upto 180MHz." That would cover the
whole range of my receiver.

Anyone have any experience of this, or any other active antennae? I'd
rather build one than buy one, anyone got any designs they can recommend?

Thx.

I just ordered one of these this morning.
https://www.ebay.com/itm/MiniWhip-Ac...AOSwurZZLoq W

Oh, sorry only good to 30MHz.
Mikek



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Antennae Gareth's Downstairs Computer Antenna 3 July 28th 17 03:15 PM
Everything you want to know about antennae .... gareth Antenna 20 March 4th 16 04:09 AM
Screwdriver antennae? gareth Antenna 0 November 23rd 15 01:28 PM
The inefficiency of short antennae compared to long antennae, as previously discussed. gareth Antenna 119 February 24th 15 10:54 AM
Looking for help regarding satellie antennae [email protected] Antenna 8 September 1st 05 03:21 AM


All times are GMT +1. The time now is 12:33 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017