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 How to read ERP?

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13oots2
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Call Sign : 26-CT-4694, M7EUS
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Equipment Used : Yaesu FT950, 66FT Endfed Antenna, Various Other Bits and Pieces
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How to read ERP? Empty
PostSubject: How to read ERP?   How to read ERP? Icon_minitimeSat Jul 08, 2023 3:23 pm

I bought an ATU off EvilBay and exchanged a few messages with the seller, who happened to be a full licence holder. Not that I am going to do it, but he said that with a compromised antenna that as a Foundation licence holder could probably run 15W to 20W and still remain within the legal ERP.

My question to the usual suspects (Victor) would be how do you actually measure ERP? I am sure there is a significant amount of maths that could be used to work it out, it just got me curious and would like to add that I have a cat and am not one Shocked

Ain't I just full of questions today.

Edit Just realised he was talking rubbish about the power being ERP for Foundation, most bands are PEP.
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SangueG
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How to read ERP? Empty
PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitimeSat Jul 08, 2023 11:32 pm

You're correct Mark, there are not many frequency allocations that state maximum erp, most state pep. To calculate your erp you need to take the output of your transmitter, subtract feeder losses, then multiply (or subtract) the gain (or loss) of your antenna antenna.

If you've got 3db (halving your power) feeder losses and your antenna has a 1db loss, then for a max erp of 10W the person you messaged has given good theoretical figures.

Kept it simple for now, but does that help and make sense?

FamousPablo, Victor and 13oots2 like this post

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chazwozza
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How to read ERP? Empty
PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitimeFri Jul 28, 2023 12:28 am

Wouldnt worry about erp to much unless using a beam and pointing at houses other than that the power you can use is at antenna point
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43CT016
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How to read ERP? Empty
PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitimeFri Jul 28, 2023 1:48 am

SangueG wrote:
You're correct Mark, there are not many frequency allocations that state maximum erp, most state pep. To calculate your erp you need to take the output of your transmitter, subtract feeder losses, then multiply (or subtract) the gain (or loss) of your antenna antenna.

If you've got 3db (halving your power) feeder losses and your antenna has a 1db loss, then for a max erp of 10W the person you messaged has given good theoretical figures.

Kept it simple for now, but does that help and make sense?

Aren't your power limits set as "into the antenna", and not ERP though?
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SangueG
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SangueG


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Equipment Used : Little radios, home-made antennas

How to read ERP? Empty
PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitimeFri Jul 28, 2023 5:52 am

43CT016 wrote:
SangueG wrote:
You're correct Mark, there are not many frequency allocations that state maximum erp, most state pep. To calculate your erp you need to take the output of your transmitter, subtract feeder losses, then multiply (or subtract) the gain (or loss) of your antenna antenna.

If you've got 3db (halving your power) feeder losses and your antenna has a 1db loss, then for a max erp of 10W the person you messaged has given good theoretical figures.

Kept it simple for now, but does that help and make sense?

Aren't your power limits set as "into the antenna", and not ERP though?

Mostly, yes. But there are a few exceptions if you check the licence terms and conditions.
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Ivy Mike
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Ivy Mike


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Age : 69

How to read ERP? Empty
PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitimeSun Jul 30, 2023 12:37 am

13oots2 wrote:
I bought an ATU off EvilBay and exchanged a few messages with the seller, who happened to be a full licence holder. Not that I am going to do it, but he said that with a compromised antenna that as a Foundation licence holder could probably run 15W to 20W and still remain within the legal ERP.

My question to the usual suspects (Victor) would be how do you actually measure ERP? I am sure there is a significant amount of maths that could be used to work it out, it just got me curious and would like to add that I have a cat and am not one Shocked

Ain't I just full of questions today.

Edit Just realised he was talking rubbish about the power being ERP for Foundation, most bands are PEP.

RSGB EMF calculater does it all for you.

Stick in your station details and you will also cover yourself for complaince.
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PostSubject: Re: How to read ERP?   How to read ERP? Icon_minitime

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