Hello Laurent,
this one seems to be the smaller brother of my 2,6 GHz board. Expect about 100 - 120 W in DATV when using a combiner of the two stages. Maybe the filters and the isolators have to be removed. The 3 dB Xinger should be oK for 2,4 GHz. The I2C controll maybe the same. Lets see what benno is finding out in this regard.
73 Gerhard
Hallo all...
many thanks for informations about the new OFFERS on **bay ... i got also this pallets 2.2 and 2.6GHz version for playing with
(but like always to low time for hamradio beside the job)
PA3FBX and OE3GBB please look into your conversation in the amsat forum....TNX
BTW: modified the BLC8G22LS450AV with good results on 2.4G ..last update 2.april 2022
https://dg0opk.darc.de/Pallet_2022_1.html
73 de mike dg0opk
Hi Mike, I have that pallet also and found when you change the outcoupling of the left amplion the current reduces 1 amp and power increase 10 watt.
thank you Gerhard for the answer but it's not the same PA, I'll have to manage alone hi..
73 Laurent f4fdw
Hello Gerhard.
have there been meanwhile any results in the evaluation of these 2.6GHz PA boards?
Kind regards
Matthias
Hello Mathias,
Unfortunatly I am completly covered with family projects and other ham radio work. So will not have time the next months to work on this pallet.
73 Gerhard
Hello Gerhard,
ok, no problem. I was just wonderingas this PCB looks promising.
Are you aware of any information with respect to the adjustment/programming of the board?
Kind regards
Matthias
Sorry, no, so far nobody seems to have used this board or is willing to send information.
Gerhard
Hello Gerhard,
nevertheless thank you very much for your answers.
Kind regards
Matthias
Hello Matthias,
I did some bias-adjustment tests on the PA that was sold as „ …4x BLF8G27LS-140V – STEREO ..:)“, assuming this is the PA we are talking about.
This PA uses a programmable 8bit potentiometer for the bias adjustment of the main and the peak transistors (as part of an analogue temperature compensated bias network). Unfortunately, the programmable bias voltage range of the peak transistor is limited to 0.4-0.6V.
As the PA uses the same transistor type for main and for peak channel, I simply connected the bias of the peak transistor in parallel to the main transistor and set the bias current to 1A per transistor.
73 Jean DJ0VL
PS: the other PA (2x BLC9G22XS-400AVT-2) that use the LMP92066 for the bias generation can be programmed to set the peak transistor to mode AB without any hardware modification.
Hi,
My DC bias modification for the BLF8G27LS-140V is quite simple. I removed two resistors in the bias path of the peak transistor (marked as ‘1’ and ‘2’ in the attached picture) and connected the bias by a wire (endpoints marked as ‘3’ and ‘4’). The wire connects the switched bias voltage to the peak transistor’s gate.
I guess that it would be possible to change the potentiometer range to the desired value by reverse engineering of the bias circuit, however I’ve chosen the simple way. The transistors seem to be well matched, as their bias currents are nearly identical with their gates connected in parallel.
73 Jean DJ0VL
Ok thanks a lot, I'll try it too during the week!
The power obtained is acceptable!
73
IU4GAV
Andrea
Hi Andrea,
Good luck with the modification. Please email me if you need to reprogram the digital potentiometer.
I'm not yet done with HF modifications. Without any changes to the signal path, the small signal gain at 2.4GHz is some 3dB lower compared to 2.6GHz.
73 Jean
Display MoreHello Matthias,
I did some bias-adjustment tests on the PA that was sold as „ …4x BLF8G27LS-140V – STEREO ..:)“, assuming this is the PA we are talking about.
This PA uses a programmable 8bit potentiometer for the bias adjustment of the main and the peak transistors (as part of an analogue temperature compensated bias network). Unfortunately, the programmable bias voltage range of the peak transistor is limited to 0.4-0.6V.
As the PA uses the same transistor type for main and for peak channel, I simply connected the bias of the peak transistor in parallel to the main transistor and set the bias current to 1A per transistor.
73 Jean DJ0VL
PS: the other PA (2x BLC9G22XS-400AVT-2) that use the LMP92066 for the bias generation can be programmed to set the peak transistor to mode AB without any hardware modification.
Hello Jean,
thank you for your answer.
No, I was referreing to the board with the BLC9G27XS-380AVT transistors.
Kind regards
Matthias
Display MoreHello Jean,
thank you for your answer.
No, I was referreing to the board with the BLC9G27XS-380AVT transistors.
Kind regards
Matthias
Hello Matthias,
Ok, my assumption was wrong - sorry.
Looking at the picture, your PA might use a LMP92066 for the bias voltage generation.
I've written a tiny tool for the programming of those LMP92066, adjusting the bias voltage and the LUT of the peak transistor was no big deal (at least with my BLC9G22XS-400AVT PA).
73 Jean
I've written a tiny tool for the programming of those LMP92066
You can describe how you did it.... ?
73 de Robert
You can describe how you did it.... ?
73 de Robert
Hello Robert,
It's a small sketch running on an Arduino Nano (or Raspi Pi Pico with small adaption). The Arduino connects to the LMP92066 via testpads on the board. Some commands send to the Arduino by a terminal program read/write registers of the LMP92066. The main task was to read and understand the datasheet and to figure out the I2C wiring on the board 
In case of interest, I can publish the sketch and some instructions for use (in German).
73 Jean
Does anyone have or has modified a Nokia LTE like the one in the photos?
Does anyone know the name of the type of RF connectors?
Thanks
