• To anyone looking to acquire commercial radio programming software:

    Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.

    If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.

    To obtain Motorola software see the Sticky in the Motorola forum.

    The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.

    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

    This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.

11 meter dipole

Status
Not open for further replies.

mmckenna

I ♥ Ø
Joined
Jul 27, 2005
Messages
15,253
Location
SNCZCA01DS0
Sure. I've got a neighbor down the street with a dipole set up like that.

Some things you want to look out for, though:

If you roof is metal, or there is any metal structure under the roof, you'll want to make sure you put your antenna high enough above it to prevent interaction between them.

Support the coax well so it's not pulling on the center too hard.

A dipole is going to be bi-directional, in other words it's going to work best broadside to the antenna.
If you've got the space, time, money, set up to dipoles with a coaxial switch. Put the dipoles at 90º to each other and you can switch between them and see which one works best for the specific conditions.
 
Joined
Sep 19, 2016
Messages
35
Location
Québec canada
Sure. I've got a neighbor down the street with a dipole set up like that.

Some things you want to look out for, though:

If you roof is metal, or there is any metal structure under the roof, you'll want to make sure you put your antenna high enough above it to prevent interaction between them.

Support the coax well so it's not pulling on the center too hard.

A dipole is going to be bi-directional, in other words it's going to work best broadside to the antenna.
If you've got the space, time, money, set up to dipoles with a coaxial switch. Put the dipoles at 90º to each other and you can switch between them and see which one works best for the specific conditions.
thank you very much my freind
 

wyShack

Member
Joined
Nov 18, 2008
Messages
436
Location
Campbell County, Wyoming
another thing to keep in mind is what is commonly known as polarization. A dipole radiates a horizontally polarized signal. Most CB antennas are vertically polarized. At 27 Mhz, the 'loss' caused by cross polarization is over 20 DB-or several S units. Back in the day, some beam antennas (like the Moon Raker) allowed the user to switch from vertical to horizontal. for local work using SSB you can almost 'share' a channel with one group horizontal and one vertical. The big problem is horizontal antennas at 27 Mhz are way to 'cumbersome' for a mobile.
 

prcguy

Member
Joined
Jun 30, 2006
Messages
10,836
Location
So Cal - Richardson, TX - Tewksbury, MA
If the OP is more interested in long distance skip then the dipole will work fine, plus it will reduce some local vertically polarized stuff. You won't see 20dB of difference between a horizontal and vertical CB base antennas due to reflection and refraction, but you can get 30dB or more cross pol isolation when pointing up to a satellite where there is nothing to corrupt the signal. I had some high end antenna feeds for antenna range testing that were rated at 40dB cross pol and that is about the limit you can acheive.
prcguy

another thing to keep in mind is what is commonly known as polarization. A dipole radiates a horizontally polarized signal. Most CB antennas are vertically polarized. At 27 Mhz, the 'loss' caused by cross polarization is over 20 DB-or several S units. Back in the day, some beam antennas (like the Moon Raker) allowed the user to switch from vertical to horizontal. for local work using SSB you can almost 'share' a channel with one group horizontal and one vertical. The big problem is horizontal antennas at 27 Mhz are way to 'cumbersome' for a mobile.
 
Status
Not open for further replies.
Top