Yagi for simulcast problem

[KC0CSE]

ok what type of yagi would I use for the p25 system 800meg? trying to fight the simulcast problem by using a yagi...thanks

 

[GTR8000]

An 800 MHz Yagi

 

[radioalbany]

800 MHZ YAGI

You're in luck, because several manufacturers make relatively inexpensive yagis to use on 800 mhz cell phone systems. You might try this one:

Wilson 301111 YAGI CEL Cell Phone Antenna - High Gain | RepeaterStore

Just be sure that you get the right connectors for the radio and antenna ends of your cable and keep the cable as short as possible. At 800 mHz, small coax like RG-58 is really, really lossy.

Good luck with whatever you decide!

73,

Andrew Ellis NO6E
Lafayette, CA

 

[n5ims]

Remember that an antenna doesn't really care what type of signal (analog, digital, TV, Cellular, etc.) the signal is, only that the frequency is within it's design range. One other thing to consider is polarization (scanner signals are nearly always use vertical polarization) so it's important that the antenna design (and/or mounting if applicable) orients the antenna so it provides vertical polarization (other polarizations may work, but will provide lower signal levels). Select an antenna that covers your desired frequency range(s) well based on their design. Note that once the marketing folks get involved, they may say "Works on all signals from DC to Daylight, providing the best coverage of any blah, blah, blah". When you see stuff like this, remember that "Works" doesn't always indicate "Works well" (a skateboard may "work" during a NASCAR race, but you can be sure that a true vehicle designed to NASCAR specs will many laps ahead of that skateboard when the race is done).

Some good choices may include one of the antennas in the links below:
800 MHz Yagi Antennas : The Antenna Farm :: , Your Two Way Radio Source!
https://www.tessco.com/products/displayProducts.do?groupId=342&subgroupId=47

If you want to roll your own you may want to check out this thread --> http://forums.radioreference.com/scanner-receiver-antennas/107278-build-800mhz-yagi.html

As was indicated above, it's quite important to use a quality, low loss coax as well. The loss at 800 MHz is generally quite high for many types of coax so you'll want to pick one that minimizes the loss or you'll end up with very little signal at the radio end of your coax run. Keeping the run as short as possible is at least as important as selecting the proper kind since coax loss is measured in loss per 100 feet.