lockdown boredom

[Santiago]

shame, will have to roll without then

[Santiago]

checked mine for power today got about 6/7 watts, listened through some headphones to check it was locked and there is a high pitched terrible hum, could it be the psu?

[Electronically]

checked mine for power today got about 6/7 watts, listened through some headphones to check it was locked and there is a high pitched terrible hum, could it be the psu?

High pitch normally means your swr is high. Or earth problem. Depends what psu you have going through it.

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[Santiago]

it's going through meter into a dummy load, might be psu? it's a small one 15v rated 1.5amps

[Electronically]

it's going through meter into a dummy load, might be psu? it's a small one 15v rated 1.5amps

Sounds like the psu. Double check the earth inside psu is connected could off fell off if dropped etc. Only way to know is try another power supply if that stops it then must be. Or maybe your to near equpimenet to cause a buzz.

Sent from my AMN-LX9 using Tapatalk

[Electronically]

it's going through meter into a dummy load, might be psu? it's a small one 15v rated 1.5amps

Sounds like the psu. Double check the earth inside psu is connected could off fell off if dropped etc. Only way to know is try another power supply if that stops it then must be. Or maybe your to near equpimenet to cause a buzz.

Sent from my AMN-LX9 using Tapatalk

Does it hum with swr meter disconnected if not then there's your problem.

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[Electronically]

it's going through meter into a dummy load, might be psu? it's a small one 15v rated 1.5amps

Sounds like the psu. Double check the earth inside psu is connected could off fell off if dropped etc. Only way to know is try another power supply if that stops it then must be. Or maybe your to near equpimenet to cause a buzz.

Sent from my AMN-LX9 using Tapatalk

Does it hum with swr meter disconnected if not then there's your problem.

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Or either set it back to 13.8v just the your board might no like 15v. So that might lower the buzz.

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[Santiago]

board says 15v on the input, checked psu with meter, its giving 15v, ill try without swr meter plugged in

[Electronically]

board says 15v on the input, checked psu with meter, its giving 15v, ill try without swr meter plugged in

OK try that

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[Electronically]

board says 15v on the input, checked psu with meter, its giving 15v, ill try without swr meter plugged in

OK try that

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If that doesn't work try decreasing a watt or two

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[mikroman]

If you are using smps power supply it is very likely that it is poorly filtered.

[Santiago]

it's not a switch mode, prob worse lol

[teckniqs]

That is indeed a switching mode supply, what makes you think it isn't?

...I tried running a band one link box from one a while ago and there was a high pitched "whining" sound coming over the audio, as soon as I changed it to a standard transformer with bridge rec and smoothing cap it was completely gone.
Same thing happened when I tried to run a microwave midpoint from a laptop charger.

[Phoenix]

Get a proper PSU
That is a horrible switch mode thing
Transformer rectifier and smoothing cap

[Santiago]

like u said its prob worse, I was correct.

i literally dug it out to test the board, was going to run it off a car battery if all was well, which it seems to be mi us the psu

[teckniqs]

Car battery will be fine, like the cleanest DC supply that anybody can offer.

....Just remember to be careful not to let it drain below 11v.

[Santiago]

I'm going to add that 12v voltage cut off board off flea bay that pranker recommended.

I have a dipole I can use, but was thinking making something with a little gain, depends how much free time I have over over jyn e next few weeks

[Albert H]

If you're heading for the trees, you want to get the aerial above the foliage if you can. I used to use wire J-poles inside white plastic plumbing pipe. Paint the pipe pale grey or blue with acrylic paint, and it's practically invisible from the ground!

[Santiago]

Albert I'm thinking flower pot antenna, not not sure if I'm calculating right, 2 quarter wavelengths of 81.3cm and 13 turn choke on a 32mm pipe is 87.6?

[surefm]

Finally got this working ok, Audio in just using mono and sounding ok with little hum, just running it at 1 watt but it did go up to 8 watts full power,
going to use it just for a driver board is my plan.