• 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.

RFI 2 element Handheld portable Yagi plans needed

Retroradio

Member
Joined
Jan 4, 2015
Messages
247
Location
Ontario
A buddy has intermittent huge bouts of noise in his area. A small directional antenna hooked to a walkie talkie is the plan. Already used the unit in the hoeizontal position but as its now working as a dipole its bi-directions;,. Need plans for a quick Yagi style to give better directionality.
 

KB4MSZ

Billy
Premium Subscriber
Joined
Mar 12, 2018
Messages
438
Location
Tampa, Florida
At what frequency is the noise? For a Yagi to work it has to be very specific in frequency for it's tuned element lengths. I hope your noise isn't on 11 meters.
 

Retroradio

Member
Joined
Jan 4, 2015
Messages
247
Location
Ontario
At what frequency is the noise? For a Yagi to work it has to be very specific in frequency for it's tuned element lengths. I hope your noise isn't on 11 meters.
Thanks for the reply!
Its a local CBer’s issue. I have noise myself on 80m but that was easy to identify as its the power lines that run across my backyard...hi hi.

Ive built lots of antennas but to make a RFI one thats portable has not turned up anything on the net. Loops yes but bidirectional hence a 2 element Yagi Seems logical. Coils To reduce size, etc... Gotta be a plan out there somewhere....lol
My 2m Yagi was breeze to build.
 
Last edited:

Retroradio

Member
Joined
Jan 4, 2015
Messages
247
Location
Ontario
Size matters full wave cb is over 36 feet tall.
Fully understand as Ive bult mutiple aerials and several CB ones as well over the years but never a FOX Hunting style antenna Being utilized for RFI noise with directivity. Being a FOX hunting antenna portability is the key.
 

Retroradio

Member
Joined
Jan 4, 2015
Messages
247
Location
Ontario
Thanks for the replies so far.
Ive seen posts of people talking about this sort of thing.
I imagine 2 firestick type whips set up as a dipole on the horizontal with a reflector behind them would work but am looking to build from scratch.
 

JayMojave

Member
Joined
Dec 13, 2007
Messages
688
Location
Mojave Ca
Hello Retoradio: The power line noise is most commonly heard on the HF band 3 to 30 MHz, but I have seen small VHF 2 meter yagi beams work. The key here is to make sure the noise can be heard on the VHF 2 meter band, so that the yage can be used. Some power line noise does not radiate the noise on the VHF bands. But some noises do, its the way the power lines are arcing I believe. Maybe walking around with a 2 meter HT will indicate if its detectable.

Looking at the power line noise on a spectrum analyzer you can see the power line noise drop off in amplitude as the frequency increases. How ever that maybe a good thing allowing the noise to only be detected at short ranges, indicating the noise source. It seems every noise Radio Interference (RFI) is some how different.

The local power company here just drives around while listening to his AM radio in his truck on a clear frequency with no stations being heard to start the isolation process. Then they use a small dish with a audio amplifier to actually hear a arcing noise to isolate the noise.

The ARRL has books on RFI and such. Good luck. Please let us know what the fix is.

Jay in the Great Mojave Desert.... "Next Gas 150 Miles"
 

Retroradio

Member
Joined
Jan 4, 2015
Messages
247
Location
Ontario
JayMojave, great info!. I have given him an old AM CB walk-in talkie and he has walked around with it. Using it Horozontalilly he has determined by sound direction very roughly its direction, bi-directionally. I had suggested an old am radio as well...lol Like Many these days He doesnt own one.
Other operators have driven through his neighborhood and noted the noise is strong. If I have .5 S unitS of noise he is dealing with 9-15 S units.... It is so overwhelming that a directional antenna would help but alas there’s a couple of us trying to help him out.
Oddly enough its not consistent and I would imagine if it was power lines etc... it would be. This comes and goes sometimes for days... There is a power substation in his area that he’s going to check out.

I had thought of and tried my 2m Yagi (satellite antenna) at home as a probable with no luck so eliminated it. Ill try it at his place and see.

Will keep advised as this mystery unfurls.
 

GrayJeep

Member
Joined
Jan 6, 2007
Messages
958
Location
N. Colo.
Powerline noise can come and go with humidity. Contamination on an insulator can leak energy when damp but not when dry. Just one of the many confounding factors in chasing RFI.
 
Top