Frequencies

USB dial (MHz): 0.136, 0.4742, 1.8366, 3.5686, 5.2872, 7.0386, 10.1387, 14.0956, 18.1046, 21.0946, 24.9246, 28.1246, 50.293, 70.091, 144.489, 432.300, 1296.500

Spot Count

1,612,718,837 total spots
1,124,939 in the last 24 hours
27,145 in the last hour

3rd Party Maps and Data

M0XDK Map
KB9AMG Monthly Stats

Who's online

There are currently 42 users online.

Why won't a magloop give good VSWR?

26 posts / 0 new

Log in or register to post comments

Last post

Fri, 2013/12/27 - 17:31

#1

G4APB

Offline

Last seen: 2 weeks 5 days ago

Joined: 2013/08/29 - 07:29

Why won't a magloop give good VSWR?

My 7MHz magloop VSWR only dips to 4:1. The resonant point is not very sharp (maybe 50KHz wide), but the RX noise seems to be peaking well at this frequency. My main loop is 1m dia, capacitively tuned using an approx 1 metre length of open ended RG58 coax, and the feed loop is 1 fifth of this diameter which I am feeding with 50 ohm coax.

It does seem to get out on Tx but I am having to use an ATU to match.

Any of you magloop experts have any idea why I can't get a lower VSWR?

73 Ken