OK, so that is good value for money then!!
Let's build a PA for 2,4 GHz
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Do you have any indication of the actual output power of the MFR21045??
Cor
OUT: 21W
IN: 2W
24VCC
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Hi,
are there alternative sources for the RF amplifiers, other than Digikey and Mouser?
The DJ0ABR stage 2 amplifier seems to have a lead time of 12 weeks...
Thanks in advance.
73, Thorsten
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Hallo Kurt,
sind noch Platinen für die PA erhältlich ?
Ich wäre an einer interessiert.
73,
Martin
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MW7IC2725N, datasheet here. The design is straight forward per datasheet (also F6BVA made a design earlier) albeit that this design is on 1.0mm FR4 PCB (being the height difference between the output tab and GND tab).
The MMICs were added by Rens AXA per our request because "if he was already busy drawing the PA part, why not add some extra amplification and filtering to use the board after a mixer or Pluto?"
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DO5MZ No PCB's at the moment. Project is in its early stage. There is already v2 of the PCB on the drawing board. Yesterday the amplifier was connected to a HMC213 mixer and ADF4351 with 1968 MHz LO and 1 mW 432 MHz in gave 25W 2400 MHz out. So that also works.
I'm now busy with building the 3rd prototype and do some tests, also to test reproducibility. -
Hi Sandro,
Is that right, please? What's the Idq please? If I know, it is needed around 0,3 to 0,5A idq at least. So there is max. 0,6A of active current as photo shows.
24V x 0,6A x 50% eff. = 7,2W out
I am running 28V with Idq 0,5A. The output is modified by idea DK5DN
and input is my idea - make PCB line (add wire and solder) thick as I can. I am reaching 28V/2,2A in key down. There is 2W input (or less!) from LZ5HP transverter. I dont know the output. No power meter SRI.
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Hi Sandro,
Is that right, please? What's the Idq please? If I know, it is needed around 0,3 to 0,5A idq at least. So there is max. 0,6A of active current as photo shows.
24V x 0,6A x 50% eff. = 7,2W out
I am running 28V with Idq 0,5A. The output is modified by idea DK5DN
and input is my idea - make PCB line (add wire and solder) thick as I can. I am reaching 28V/2,2A in key down. There is 2W input (or less!) from LZ5HP transverter. I dont know the output. No power meter SRI.
Hi Viliam.
I used idq around 0,33 amp.
My wattimeter have a slow rate measurement and i dont have how accuracy calibrate.
My tests i used 18 to 32 vdd. To 30 vdd, the current was 1,75 amp.
Some months ago i quited this project and started other LDMOS.
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Hi Thorsten,
if you drive it with a single carrier up to compression it will draw around 1,5A. When used with an SSB signal usual for QO100 its below 1A.
DL1ZU, bitte wende dich an dl1ev@gmx.de, er hat einige Platinen vorrätig.
The BLF2425M9L30U is available at digikey from stock. No.: 1603-1067-ND
vy 73, Kurt, DJ0ABR
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Friday is my free day, so time to hobby! As guinea pig #2 built the 'Radioclub 't Gooi' (PI4RCG) MMIC amplifier however, deviated a little from the original design (didn't had all the parts, so the junkbox is always my best friend ; -) and used two TQP3M9009's as driver MMIC's (original design uses two SBB3089z's). My MMICs have more gain and hopefully all will be stable! Amp has to be tested of course.
Below a pic of WIP (Work In Progress) (click to enlarge)
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Friday is my free day, so time to hobby! As guinea pig #2 built the 'Radioclub 't Gooi' (PI4RCG) MMIC amplifier however, deviated a little from the original design (didn't had all the parts, so the junkbox is always my best friend ; -) and used two TQP3M9009's as driver MMIC's (original design uses two SBB3089z's). My MMICs have more gain and hopefully all will be stable! Amp has to be tested of course.
Below a pic of WIP (Work In Progress) (click to enlarge)
That looks very promising.
Congrats.
73 de CT2IRJ
Sal -
Friday is my free day, so time to hobby! As guinea pig #2 built the 'Radioclub 't Gooi' (PI4RCG) MMIC amplifier however, deviated a little from the original design (didn't had all the parts, so the junkbox is always my best friend ; -) and used two TQP3M9009's as driver MMIC's (original design uses two SBB3089z's). My MMICs have more gain and hopefully all will be stable! Amp has to be tested of course...
that looks really good ! Please think of a PTT input to switch off the quiescent current during RX.
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that looks really good ! Please think of a PTT input to switch off the quiescent current during RX.
Kurt, naturally we thought of that, see tin can, bottom left side, transit capacitor.
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Kurt, naturally we thought of that, see tin can, bottom left side, transit capacitor.
this is the 12V input for the bias voltage ?
ok, then you can use an external relais which is controlled by the TX output of a transceiver (TX=GND).
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Of course not, no relays! And of course not TX enable to GND!
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PA3FYM Are you sure that there is no need for one more filter between second MMIC and final stage to prevent self oscillations ?
There is too much gain in these two stages (final & driver). From my expirience if I use a directional coupler to observe the output I could not easy see self oscilations at 700 MHz that I have but with a power 30 dB attenuator I can see it clearly.