Me too, but i found this spec online for a high quality SMA connector: Max 150W CW @ 27GHz @ 160deg ...now, If that's the case, It could probably handle 600W at HF relatively comfortably. It's surprised me tbh. I wouldn't have guessed any higher than 50-60W max myself ..but we live and learn.
Excelent proiect Razvane, daca te apuci sa "produci" asa ceva sunt si eu interesat. Este exact tipul de amplificator LDMOS care lipseste de pe piata, toti producatorii se orienteaza spre puteri crocodilistice de minim 800-1000W. Eu zic ca sunt multi cei pentru care 4-600W sunt arhisuficienti si optiunile sunt extrem de putine, practic ne limitam la RM Italy. Succes cu acest proiect! 73 es GL de YO2MSB Bizzu
Very nice project! Congrats. I am using the smaller brother of your LDMOS FETs the MRF101 and I would like to simulate my circuit in LTSpice. Do you have a Spice Model for your MRFs? Any idea where I could find one? I asked NXP and they do not provide one they said (have their own simulation tools).
Hi there Razvan --- I have built your V2 kit and it has all worked well until I upgraded my cooling and reassembled. When I increase the DC supply to the A600 above 12V a 150-160MHz waveform can be seen at the input and output. Perhaps I damaged a component / got thermal compound residue on the PCB in a critical place? Would you kindly give me a clue as to where to begin troubleshooting this? Thanks.
@@ramsin. Doesn't work that way from 0 to Max. Those output transformers are calculated to match the transistors' Drain impedance up to 50 Ohms. At half power, the drain impedance is way off so the transformers don't work properly.
@@aga5897 I don't believe what you are saying. Impedance is unaffected by power input!!! It is only affected by frequency and it's an intrinsic characteristic of the transistor that is only dependent on frequency and very little to temperature! So reducing input power will absolutely make the transistor even last longer as they are barely pushed to their limits. Please stop telling people things you don't understand!
I know that your comment was a few years ago but I was about to ask the same question (and what the board is). I’m currently building a 300W 144 MHz PA and would like to display various info!
@@mrtechie6810 If it's for One band only, e.g. for CB use, check out the MRF300 data sheet. It has several one-band designs using 1 transistor, giving 300W output. One is for 27MHz. The board is 2" x 3" in size. Really cool.
@@mrtechie6810 Yes one transistor is sufficient but it is not going to be broad band! so it will work only for a small range of frequency. not what he is sharing in his video. in his case he is using transformers to balance spread the input to matched transistors so that the input signal is split and the power in two signals of same power (half the input) and opposite in phase. since both transistors are active in opposite phase this results in both transistors active simultaneously and in phase producing twice power of each 300watts approximately. my guess you can keep his exact same design and just eliminate one of the transistors. you'll get half the power but you are basically using only half the input power as the input transformers are dividing the power by half at each gate of the transistors.
Buna Razvan. Sunt incantat sa vad ca in RO se mai gasesc pasionati de Ham Radio Construct!!! Ma intereseaza si pe mine un amplificator asemanator celui prezentat de tine. Un pret estimativ te rog. Zi faina
IRFP250N works OK on 40m (7MHz) but cannot hack it on higher frequencies. It's a high-power switch, not designed for RF. Best i found is the IRF510. Lower power but gets up to 24MHz (just)
The PA IMD must be measured with two tone (clean) signal, not with one tone.
Nice work!. I have used PCBway in the past as well. I was very happy with their service.
Very nice project, well done, the MRF300 is a very inexpensive way to make that level of RF.
In the name of all that is good tell me I can buy this as a kit.....
Yes, ebay
Very nice project. Looking forward to the kit.
Nice looking PA, hope you can provide PCB or kit
Nice amp.
You are obviously a master of engineering.
I aspire to a higher level of skill, but I am no where near your level.
Bravo.
Arnold Schwarenegger making linear amplifiers.....awesome!
Absolutely talented.
What a great looking project! Will you be offering kits or more details for others to build it? Thanks! 73 de w8tam
Beautiful amp.
I am surprised that SMA connectors are capable to withstand 600W load. The PA is really cool! Very neat design!
Me too, but i found this spec online for a high quality SMA connector: Max 150W CW @ 27GHz @ 160deg ...now, If that's the case, It could probably handle 600W at HF relatively comfortably. It's surprised me tbh. I wouldn't have guessed any higher than 50-60W max myself ..but we live and learn.
Nice ! Looks a lot like the outstanding Motorola EB104 from 1993 by Helge O Granberg ;)
Since you're only -45dB at the 3rd, do you have plans for a switchable band specific LPF? Thanks for posting!
Excelent proiect Razvane, daca te apuci sa "produci" asa ceva sunt si eu interesat. Este exact tipul de amplificator LDMOS care lipseste de pe piata, toti producatorii se orienteaza spre puteri crocodilistice de minim 800-1000W. Eu zic ca sunt multi cei pentru care 4-600W sunt arhisuficienti si optiunile sunt extrem de putine, practic ne limitam la RM Italy. Succes cu acest proiect!
73 es GL de YO2MSB Bizzu
Multumesc Sorin ! Te tin la curent cu evolutia ;)
Very nice project! Congrats. I am using the smaller brother of your LDMOS FETs the MRF101 and I would like to simulate my circuit in LTSpice. Do you have a Spice Model for your MRFs? Any idea where I could find one? I asked NXP and they do not provide one they said (have their own simulation tools).
Hello, is the Arduino control ready? I can't find it. Can an Arduino be connected directly to the B1500 RF AMPLIFIER BACKPANEL UNIT KIT? vy73
This is what Arnold does in retirement?
Lol
Any literature and part numbers to build one? 73
Nice project. Do you have the Gerber-files available so I can order the PCB?
You promised to send back my two A600 boards in January, where are they now?
Hi there Razvan --- I have built your V2 kit and it has all worked well until I upgraded my cooling and reassembled. When I increase the DC supply to the A600 above 12V a 150-160MHz waveform can be seen at the input and output.
Perhaps I damaged a component / got thermal compound residue on the PCB in a critical place?
Would you kindly give me a clue as to where to begin troubleshooting this? Thanks.
Probably parasitic oscillation. Check the feedback. I had similar problem with MRF300's (my own brew)
@@petrsuchomel9639It sounds like parasitic oscillation.
GOOD JOB
Hi ... Can I get the Gerber file ? Regads
Great design!
I like it!
Great project Razvan! 73 de Bob AB2NE/G3ZFJ
Foarte frumos si interesant.Felicitari!
Congrats Razvan, great work and video! - vu2zap
Would love a 300 watt version!
Lower your input?
@@ramsin. Doesn't work that way from 0 to Max.
Those output transformers are calculated to match the transistors' Drain impedance up to 50 Ohms.
At half power, the drain impedance is way off so the transformers don't work properly.
Interesting, good to know. So basically the amp *has* to be pushed to 600w...
@@ramsin. You can reduce/increase a small amount, e.g. 450W, but it will be less efficient, so the transistors will heat up too much.
@@aga5897 I don't believe what you are saying. Impedance is unaffected by power input!!! It is only affected by frequency and it's an intrinsic characteristic of the transistor that is only dependent on frequency and very little to temperature! So reducing input power will absolutely make the transistor even last longer as they are barely pushed to their limits. Please stop telling people things you don't understand!
Razvan buna. Sunt incintat fii amabil da-mi te rog un mod de contact er1zz. Bravo, mersi.
Well done, a lot of work and looks like it was well worth it! 73 de VK2AOE
Question. What heat sink compound did you use? did you solder the transistors to the heat spreader?
Schowalter Avenue
Where can I find PCB layout?
73!
Are you making these AMPS commercially?
Just the MRF300AN & MRF300BN transistors cost more than $120!!!
@@JohnUsp So? That is an ok price for this level of power. I would like to build a 250 watt version.
so no low pass filter board is needed ?? do you happend to have the controler board also ?
Why do you think that?
@@MrTalaue uhm... because I did not heard him talk about low pass filters... that's why...
@@Aleziss He did not talk about a T/R switch or a cabinet either.
So... As he did not talk about any of those things either... Does it need a low pass filter?
@@AlezissDepends on the regulations in your country. In Germany -40dB are required and that linear is 5dB better.
McLaughlin Hollow
Bertrand Light
Johnston Avenue
FB do you have the version with 4 MRF300 1KW?
BEST 73
hi can you tell me where i can find the arduino codes for the lcd sreen?
I know that your comment was a few years ago but I was about to ask the same question (and what the board is). I’m currently building a 300W 144 MHz PA and would like to display various info!
I happen to have a 48V power supply (UPS / battery - 45-58V). How would I change the design to produce 250 watts out?
Reduce input power?
@@BarsMonsterok, but would a 300 watt design be cheaper to build and more efficient to run?
Perhaps using one MRF300?
@@mrtechie6810 If it's for One band only, e.g. for CB use, check out the MRF300 data sheet.
It has several one-band designs using 1 transistor, giving 300W output.
One is for 27MHz. The board is 2" x 3" in size. Really cool.
@@mrtechie6810 Yes one transistor is sufficient but it is not going to be broad band! so it will work only for a small range of frequency. not what he is sharing in his video. in his case he is using transformers to balance spread the input to matched transistors so that the input signal is split and the power in two signals of same power (half the input) and opposite in phase. since both transistors are active in opposite phase this results in both transistors active simultaneously and in phase producing twice power of each 300watts approximately. my guess you can keep his exact same design and just eliminate one of the transistors. you'll get half the power but you are basically using only half the input power as the input transformers are dividing the power by half at each gate of the transistors.
@@mrtechie6810 You could use two MRF150 devices, but you will have to redo the output transformer for proper impedance matching.
What is the 12v bias amp needed?
Can I use with hand hold walkie talkie
Nice!
Alfred Shores
Buna Razvan. Sunt incantat sa vad ca in RO se mai gasesc pasionati de Ham Radio Construct!!!
Ma intereseaza si pe mine un amplificator asemanator celui prezentat de tine. Un pret estimativ te rog. Zi faina
Ankunding Forges
Amazing voice and nice amp!
Pink Lock
Razvan +++ молодец, Вам надо отдать 1 место!
не то что занявший 1 место, с рисованным мультфильмом американец.
Johnston Mission
Is the power 300 watts on fm ?
Ulices Glens
Hello! UB3AXZ is here :) 73!
O'Keefe Fields
Sister Mission
Jonathon Circle
Dickinson Cliff
Kerluke Stravenue
Cordelia Crossroad
Has anyone tried a irf250 or have any information about a amp using this transistor I see some videos but not a lot of info
IRFP250N works OK on 40m (7MHz) but cannot hack it on higher frequencies.
It's a high-power switch, not designed for RF.
Best i found is the IRF510. Lower power but gets up to 24MHz (just)
Norene Falls
Narciso Summit
Leland Isle
Duncan Fork
Emmerich Tunnel
Tillman Wall
Kennith Tunnel
Skiles Crossing
Schiller Rest
Farrell Village
Mable Mountains
Is the output of the amplifier an SMA connector?🤭
No, the output is RF energy. 😊
@@mrtechie6810 Hahaha.
Fidel Springs
Tomasa Canyon
Romaguera Canyon
Pfannerstill Lodge
Kiara Extension
Florine Road
where to buy toroids?
Rodriguez Circles
Juana Harbor
Olson Track
Myrtle Roads
Walsh Expressway
Shanahan Mountain
Sid Grove
Cummings Walks
Ondricka Ville
Gerhold Pike
Stanley Summit
Grimes Branch
Predovic Valley
Arne Village
Bethany Shore
Yuri Mudryk UT5UMQ
Sammy Tunnel
Walter Corner