Comments on: Arduino Code for 0-500MHz, 1nW to 100W RF Power Meter https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/ Freelance Technical Author, Illustrator & Photographer Sun, 30 Apr 2023 14:50:17 +0000 hourly 1 https://wordpress.org/?v=6.4.3 By: Mohsin Siddique https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-436146 Sun, 30 Apr 2023 14:50:17 +0000 https://photobyte.org/?p=645#comment-436146 I bought chinese ad8307 module . I have made changes I hooked up 50ohom resistor at the front end of the ad8307 module. You recommend not to use chinese ad8307 module. So what should I do. Which website is the best to buy this chip

]]>
By: Mohsin Siddique https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-436145 Sun, 30 Apr 2023 14:43:56 +0000 https://photobyte.org/?p=645#comment-436145 Mike thanks for quick reply. AD8307 module from SV1AFN, has an opamp Lm358. Had you used the opamp?

]]>
By: Mike Richards https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-436144 Sun, 30 Apr 2023 14:10:26 +0000 https://photobyte.org/?p=645#comment-436144 In reply to Mohsin Siddique.

Hi Moshin,

The project was based on using the AD8307 power detector module from SV1AFN. You will find a link HERE

The module is based on the AD8307 application note, so should be easy to recreate. NB: I don’t recommend using the cheap AD8307 modules from eBay (China) as, in my experience, they use substandard components that make accurate calibration very difficult.

Regards,

Mike

]]>
By: Mohsin Siddique https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-436134 Sun, 30 Apr 2023 10:26:13 +0000 https://photobyte.org/?p=645#comment-436134 Which schematic do I have to use?

]]>
By: YorM https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-132069 Fri, 18 Sep 2020 08:32:37 +0000 https://photobyte.org/?p=645#comment-132069 In reply to Mike Richards.

Hi Mike

Thanks !

73
Yoram
4X1YS

]]>
By: Mike Richards https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-132068 Fri, 18 Sep 2020 08:16:09 +0000 https://photobyte.org/?p=645#comment-132068 In reply to Yoram.

Hi Yoram,

I sold the original article to Practical Wireless magazine so they own the copyright. I suspect the link you were given was an illegal copy, hence its removal.
The AD8307 module I used was the one in the link below by Makis SV1AFN. Makis makes a range of useful RF modules. If you follow the link he has the AD8307 data sheet as well as notes on its performance. That should give you all you need.

AD8307 Module

Regards,

Mike – G4WNC

]]>
By: Yoram https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-132064 Fri, 18 Sep 2020 06:28:21 +0000 https://photobyte.org/?p=645#comment-132064 Hi Mick
I am looking for your article regarding understanding the AD8307 component

( http://techham.altervista.org/Arduino-Ham/A%20Look%20at%20the%20Arduino.pdf )

And unfortunately the link does not work….
Is there a link to the article Please ?

Thanks again
73
Yoram
4X1YS

]]>
By: Yoram https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-132062 Fri, 18 Sep 2020 05:59:17 +0000 https://photobyte.org/?p=645#comment-132062 In reply to Mike Richards.

Hi Mike

Thanks for the quick response
Indeed changing the parameter did the job
simply incredible !
This is a nice upgrade to my dummy load .
When I finish the job I will be happy to send pictures of the final product .

Thank you so much Mike !!

73
Yoram
4X1YS

]]>
By: Mike Richards https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-132001 Thu, 17 Sep 2020 17:43:48 +0000 https://photobyte.org/?p=645#comment-132001 In reply to Yoram.

Hi Yoram,
In the Arduino sketch, I compensate for the loss in the RF tap by altering the intercept point used for the power calculation. The intercept point is the power input required by the AD8307 to give a theoretical 0V output. This figure is calculated from the power vs voltage slope of the AD8307. However, useful results can be had by using the nomonal intercept point of -88dBm. For a 40dB power tap from the transmitter, that figure needs to change to -44dBm but for your 60dB tap/attenuator the intercept will be -24dBm.
To adapt the code for your system, do the following:
Find the “// initialise the variables” section of the sketch
Find the line that begins: float intercept =
Change that line to read: float intercept = 24.0;

That’s it!

Regards,

Mike – G4WNC

]]>
By: Yoram https://photobyte.org/arduino-code-for-0-500mhz-1nw-to-100w-rf-power-meter/#comment-131901 Thu, 17 Sep 2020 09:22:59 +0000 https://photobyte.org/?p=645#comment-131901 Hello
I find the article and project very useful for my station
I built a 3Kw dummy load and this power Meter would be a great upgrade .
How to change the maximum display power to 3Kw Please?
I use a 60 db attenuator
Would appreciate help
Many thanks

73
Yoram
4X1YS

]]>