Let's say a transmitting station is using a 8W radio with a J pole antenna. The cable connecting the radio to the antenna is RG-58A/U and is 25ft long.
At 144.075MHz, the attenuation of the cable is 1.5dB. At 8W, the power from the radio is 9.03dB. Assuming no losses other than cable losses, the antenna is getting 7.53dB, or 5.66W.
Let's now say the receiving station, 4 miles away, has the same setup (8W radio, J pole, and RG-58A/U). Assuming the gain of the two J pole antennas is 2.15dBi, and using the Friis transmission equation, the receiving antenna is receiving 1.733e-8W.
With the cable losses of the receiving station being 1.5dB (1.41W), and the antenna receiving 1.733e-8W, it appears the received signal will never make it to the receiving station's radio.
Me and my buddy have this setup with Baofeng BF-F8HP radios. If we are both using J pole antennas, we cannot communicate with each other. If one of us is using a J pole and the other is using the stock rubber ducky, the rubber ducky user can receive the J pole user's transmissions. I'm assuming the reason we cannot communicate with each other if we are both using J poles is because of the cable losses.
Is this correct? If so, is there a way around this?