Tim-B
Member
If I have some commercial HT antennas with BNC connectors and I want to cut one of them, say like an Antennex DEXC 420 BNX to the proper length for quarter wave at 770 MHz for a scanner antenna
and
If I calculate the length required as:
186,282 X 5,280 X 12 / 770,000,000 / 4 = 3.832 inches for quarter wave at 770 MHz
Then
Do I measure the 3.832 inches from the bottom of the little pointy pin in the middle of the BNC connector where it goes into the tiny hole in the middle of the scanner's connector or do I measure it from just above the connector or does the bottom measure start somewhere else? I guess what I mean is does that little pointy pin in the connector function electrically as part of the antenna or no?
and
If I calculate the length required as:
186,282 X 5,280 X 12 / 770,000,000 / 4 = 3.832 inches for quarter wave at 770 MHz
Then
Do I measure the 3.832 inches from the bottom of the little pointy pin in the middle of the BNC connector where it goes into the tiny hole in the middle of the scanner's connector or do I measure it from just above the connector or does the bottom measure start somewhere else? I guess what I mean is does that little pointy pin in the connector function electrically as part of the antenna or no?