Author Topic: MW sufficient ground ?  (Read 87 times)

MW sufficient ground ?
« on: July 11, 2026, 12:12:34 pm »
I think about a dirt cheap LPAM TX ground. Does anyone know whether a bit of old CB antenna piece of say 80cms of aluminium
tube with a copper wire coming from it would be best buried horizontally at 8 inches deep or pounded into the ground by 70cms vertically.

Also I imagine the shortest possible copper wire to the ground on TX would be best i.e. don't put the buried metal 3m away and run a 3 m copper wire over the lawn.

Sorry for silly newb questions.

I appreciate this is a compromise either way but just wondered.

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Re: MW sufficient ground ?
« Reply #1 on: July 17, 2026, 09:10:47 am »
I don’t think I can help, I found this last night kiwi sdr, its listed on the other forum here, I think they go from mw up to shortwave, if there is one near enough by 10kms, could be useful for seeing if you can hear anything coming through.

Its not something I bother with here I was suprized I found one that is 10kms away here, closer than the nearest fm one, when I tried it I couldn’t pick out anything but the strongest stations.  :P

Re: MW sufficient ground ?
« Reply #2 on: Today at 10:56:19 am »
I made my first MW transmission... about 100m with very bad sound quality and problems.

Things.... can only get better.......

I am struggling in a sea of tangled long copper wires and very little to show for it.

I hammered a bit of copper pipe 1M into the ground.

I have a tapped coil now so might be able to get a better match.. it is very labour intensive radio for 100m flea transmission.

I would like to make a Sandpaper 27 antenna like that zozo guy. They don't make them any more.

I think the problem is the current centre is on the ground, that might be ok in a field with 80 x 45m long radials.

Re: MW sufficient ground ?
« Reply #3 on: Today at 03:57:25 pm »
Well what difference 24 hr can make. I am on with a 13m vertical, 5 x 12m radials VSWR 1:1 30 turn coil base loaded.
Not using the TX I thought I would be, about 4 Watts peak going into the antenna.

Audio quite good clear, no distortion.

It might only be going 1/2 mile at a guess I need to do a bit of a range test at some stage.

A little win. Obviously a not very good antenna for these frequencies but it is an excellent match.

Re: MW sufficient ground ?
« Reply #4 on: Today at 08:29:26 pm »
Went for a drive, 6 miles on about 4-5 Watts or something like that, maybe 2W radiated.

I am very surprised, the hard work does pay off.

Who knows maybe there will be a lot more interest, the other thing is the signal stays solid and you get local bursts of interference
every now and then, and it drops out and comes back totally different propagation.

Those longer waves certainly bend around things.
« Last Edit: Today at 08:30:11 pm by Schmellenschmellen »