Posts by dk1za

Quote from DB8TF

dk1za:

in the chematic you can see:

Arduino Nano:

ADC0 AD8313 Vdet

ADC5 -20dBm set

ADC6 Ubat

Answers that your question?

Display More

Thanks! Of course you are right! My mistake was on my pcb. No connection between vin and 12K. Now it works! Excellent.

vy 73 Walter

Quote from DB8TF

dj0abr: i use a cheap 30dB directional coupler from ebay with a additional 30dB att.

This way i can measure 10mW - 100W with that little meter

If you are interested in the code and the ciruit drop me a PN.

G0MJW: for the ref i use the 3,3V from the USB chip on the nano board.

The detector board has its own 7805 linear regulator.

I use one of the free ADCs to measure the battery voltage and when it drops below

7V (in my case) and the readings change because of low voltage then a "low bat" message is displayed.

Display More

Which of the ADC's are you using? If I got it right, it is not documented in the PM you attached. As I do believe within your program in the zip file the low battery function is included and needs the measurment of the battery power.

regards Walter

Dear Jean Pierre,

Sorry, it definitly was my fault. Next time I will be more patient before asking.

Meanwhile I have tested and am absolutly enthusiastic about the new release!

Thanks for all your outstanding work.

vy73 Walter, dk1za

Thanks a lot!!!

Quote from I0LYL

new version Minitioune V0.9.9.1

http://vivadatv.org/viewtopic.…f0587d259e6e89de899#p3211

and Scan&Tioune for Beta Tester which unfortunately does not work with my hardware

http://vivadatv.org/viewtopic.…44977ef0587d259e6e89de899

tnx to

Jean-Pierre F6DZP

Display More

Hallo Lucio,

unfortunatly I do have the same prolem as DL5RDI:

even if I am logged in in the vivadatv site I get an error when trying to download the software...can you send me the file via Email ? Walterdotjonatatuksh.de

Thanks for your help

73 Walter

Quote from DB8TF

PA3AOD: fix:

first load the _1 file and let the powermeter boot up. (initalize eram variable)

then load the _2 file and from now on the ATT setting should be permanent stored in the internal eprom.

73s

Thanks for the excellent program. It works!

Is it possible to get the code? I would like to use I2C (A4 and A5 in Nano) which are blocked by your code.

This would give me a chance to use an oled display and send the results via raspi to my mqtt server.

In the moment I am using the nano, raspi mqtt system for different sensors (temperature, volt, ampere) to control my nokiia pa. This pa finally works very well with your help!!

73s Walter

Thanks Sandor,

I will check tomorrow and will report. I have an idea what Rs you mean. To be sure it would be helpful if you could make circles around the Rs in the picture of your PA.

Have a nice weekend

Walter

DK1ZA

Quote from DB8TF

I recommend to change all the LDMOS bias circuits to manual setting.

Also you get rid of this "doherty" feature that improves your eff. but reduces your pwr @2,4GHz noticeably. (At least on my amp)

I used 5,1v z-diodes in series with a 10k resistor against the 28V supply and a 10k Potentiometer across the Diode.

The set voltage (middle pin on pot) again with 10k to the gate of the LDMOS.

I have set the driver to 400ma and the finals to 500ma @ 28V.

Works great and linear to ca 90w for many months now. Got many responses on QO100 about my clean signal & also measured it a few weeks ago myself.

Of course you can implement a temperature control to the bias circuit but the IDq rises not that much if the LDMOSes are properly cooled.

The cooling fans on my amp starting at 37° and i never encountered problems with the IDq or signal quality.

I'm happy without all that "extra" stuff..

73s

Display More

Hello Florian,

After observing the same error as @ DF2HF (# 279) and @ DK4FT, as a beginner I now dare to make the necessary modifications to get the bisonelectronics PA to work as described by you.

Your posts # 136, # 137 (doherty mod with picture), # 146, # 161, # 163, # 232 and especially # 286 are extremely helpful.

Now to my question about the Changed IDq to manual setting on both LDMOS:

do you have the connection on the BLD6G22L-150BN2, as in # 148 BLD-closeup.jpg, lifted up and connected to the Zener diode etc., or are you using another access for the IDq voltage?

How are you connecting the IDq for the preamplifier (BLC6G22L)?

If the questions are too nonsensical, please excuse me.

73 Walter dk1za