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License Free, legal, low-power radio broadcasting

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Ramsey FM-25A For S...
 
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Ramsey FM-25A For Sale with Power Supply & Antenna

 
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Last Post by Anonymous 10 years ago
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 Anonymous
(@Anonymous)
Posts: 0
 

You can get a simple TV rabbit ear dipole with lead in cable with F male connector for $10....even less!

 

Mark


 
Posted : 12/12/2016 3:04 pm
 Anonymous
(@Anonymous)
Posts: 0
 

I'd need one to be speed so it's straight up and down.  Then I could place it outside and use flat satellite cable through the window and screen frame.


 
Posted : 12/12/2016 6:12 pm
 Anonymous
(@Anonymous)
Posts: 0
 

"...just to note that even severely mis-matched dipole or whip antennas with 7 or 15 watts...of available transmitter power can radiate field intensities 3 meters away from them that FAR exceed the FCC §15.239 limit."

Even completely disregarding 15.239, severely mis-matched dipole or whip antennas (especially at powers of 7 to 15 watts) could put hash and noise elsewhere, where ya might not want it! And if aircraft and the FAA complain...well, there ya go. Other types of interference can happen with those mismatches as well.

If you are going to use a transmitter at those powers (I'm NOT saying you SHOULD), at least make sure you are clean and use the right antenna with a low SWR. Telescopic whips and TV dipoles ain't the way to go. At least I ain't convinced.

Seems everyone's broke, and we want to skimp and shortcut. Well, this is ONE hobby where THAT will get you in trouble. You CAN find yourself liable for $10,000! Although in most cases they never collect. Can't get blood from a rock! LOL!

The Ramsay is sold. Not a bad catch for $50!

Doug


 
Posted : 13/12/2016 6:40 am
 Anonymous
(@Anonymous)
Posts: 0
 

A mismatch would cook the weak coax link in TV ears, obviously 15W is over P15 levels. Part 15 chills around 10 nanowatts.


 
Posted : 13/12/2016 7:14 am
 Anonymous
(@Anonymous)
Posts: 0
 

Some re-wiring is required on most of the newer tv rabbit ears sold at big box stores.

I have a set here my daughter bought and soon found would not receive our local station 8 miles away. Too many obstructions between us and the transmitter.

After opening the case i soon realized this antenna was a overly hyped basic dipole with no visible means to "boost" an in coming signal. I guess truth in advertising doesn't hold the same meaning it used to.

But after some re-wiring the dipole section (vhf) would work well for FM despite being slightly too short for part of the fm band. This antenna is made up of three parts, a loop for UHF, rabbit ears for VHF and something weird in the middle that i can't identify.

There is a tuning selector as well. It would just be a matter of pulling the wires off of the tuning selector and soldering the dipole  directly to the coaxial cable.

 


 
Posted : 22/12/2016 9:53 am
 Anonymous
(@Anonymous)
Posts: 0
 

Maybe I can get a sighted person to help with that thanks.


 
Posted : 22/12/2016 10:06 am
 Anonymous
(@Anonymous)
Posts: 0
 

Troy

If you do this, try to get a set of rabbit ears that have a combined length of 39".
Adjust for your fm frequency using this calculator, nice thing about telescopic antennas, you can add length or take away without cutting anything.

39" will be close if not right on the mark depending on what frequency you operate on, i can't guarntee stellar results.


 
Posted : 22/12/2016 11:31 am
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