146.520 MHz is the national calling frequency for FM voice. It's a "simplex" frequency, meaning that you call on this frequency and then listen for a reply on the same frequency.
39 On the 2 meter and 70 centimeter band plans published by the ARRL, what is the difference in intended use between the calling frequencies (144.200, 432.10 MHz) and the simplex calling frequencies (146.52, 446.00 MHz)?
3 I have a commercial GE Phoenix transceiver that I sent out to be programmed on 146.460 but have been informed by a club that my transmissions are interfering with their repeater that has a 146.460 input. According to the ARRL band plan this is a simplex frequency. How is this happening? I have complied and have quit using the radio.
In partcular, 146.52 is the 2m FM voice calling frequency and should not be used for digital modes like winlink. Additionally, just because there is a standard list of frequencies doesn't mean you can just pick one and expect to get a connection.
The noise persists at nearly full strength between 146.66125 and 146.67125 before completely dropping off. Using directional finding we've isolated it to a large steam pipe in the basement.
Example. 146Mhz 300÷146=2.05 meters 2.05×39= 79.95 inches full length in inches. 79.95÷2= 39.95 inches 1/2 wave length in inches. 39.95÷2= 19.985 inches 1/4 wave length in inches. Answer on test is 19. Example 6m. Meters already given. 6×39= 234 inches full wave length in inches. 234÷2= 117 inches 1/2 wave length in inches. Answer on test ...
Just a note - calling frequencies vary by region. 146.520 MHz is the 2m calling frequency in the FM mode in Canada and the US, but not in most countries. Be sure to check if you operate in other countries!
I think I've heard both on 146.520 (But I need practice keeping track of callsigns). And just to round out the question, at the end of the conversation I've heard various ways of ending like "ABC123 clear", "ABC123", and more.
Center frequency 146.520MHz Driven element is 1/8 wave 10.25" long set at 6.125" from the front. Reflector element is 5/8 wave at 15.3" and 15.3" from driven element to the back. Director element is 1/2 wave at 12.25" and set at the front. Also, trying to figure out how to connect my SO239.
The power supply is an Alinco DM-330MV. While studying for the Technician exam I've been listening, mostly on 10 meters, and I've noticed an odd interference pattern - every 145-146 KHz I hear a steady series of beeps or chirps. I've hear them at 28.134 MHz, 28.280 MHz, 28.425 MHz, and 28.571 MHz.
