On 3/23/2021 11:30 AM, Jim Miller wrote:
In my opinion the difference between connected and disconnected of only 2db
shows that you are marginal and likely impacting your RX performance.
For this sort of evaluation to be meaningful, the RX input should be
terminated in 50 ohms. Ideally, we would like to see at least 10 dB
difference. Does that radio have a preamp? If so, it should probably be
switched on for weak signals on 20M.
Loss in 350 ft of LMR400 calcs to 1.6 dB on 20M. LDF4-50 (1/2-in) would
reduce the line loss by about 0.9 dB, LDF5-50 (7/8-in) buys you another
0.3 dB.
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|