My neighbor is 714ft (218m) away, running an ic7300 at 100w into a ZS6BW antenna at 40ft--aimed in my general direction.
73 Eric WD6DBM On Wed, Jun 24, 2020, 12:12 PM Greg Troxel <[email protected]> wrote: > Wayne Burdick <[email protected]> writes: > > > I set mutual attenuation to 30 dB, a rough estimate of the path loss > > using dipoles 500' apart at 7 MHz. This is a pretty wild guess, > > though. Loss could be much higher if the antennas were oriented to > > avoid coupling, and it'll vary with frequency, terrain, actual > > distance, etc. Of course path loss could be lower with gain antennas > > at either or both ends, aimed at the other. (A situation generally > > avoided at FD.) > > I think 30 dB loss is an extremely conservative test and that very few > people will see coupling that strong. > > At my club's 2019 Field Day, with help from several, I made measurements > of received signal strength at several of our stations with various > antennas, with a nominal 100W test carrier. Measurements are just > reading a P3 -- and note that none of the P3 owners had paid for the > NIST-traceable calibration certificate. > > Setup was CW station with K3newsyn, digital station with IC7300, only > 20m separation from one CW antenna to the digital antenna. And SSB > station with K3newsyn, 200m away. > > We did not have trouble, but always had at least 50 kHz separation. > > Received levels ranged from S9+40 to S9+73, with S9+50 typical. > > So received signals were > > -33 dBm min, -23 dBm typical, 0dBm max > > With +50 dBm transmit, that works out to path loss: > 83 dB max, 73 dB typical, 50 dB min > > (The 0 dBm received signal was between an OCFD and a G5RV, about 20m > apart.) > > It is interesting to hear of S9+65 from a neighbor. Even if they are > running 1.5 kW, seems like it must be only a few hundred meters > separation. If it's farther the details of distance, tx power, antenna > types would be interesting. > > I realize this is not responsive to Eric's question about the K4, but > thought that additional real-world cosite path loss data points would be > of interest.. > > 73 de n1dam > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
