Well done, a lot of work and looks like it was well worth it! 73 de VK2AOE
@youtubeaccount9313 ай бұрын
Nice!
@aga58977 ай бұрын
Nice ! Looks a lot like the outstanding Motorola EB104 from 1993 by Helge O Granberg ;)
@mrtechie68108 ай бұрын
Would love a 300 watt version!
@ramsin.8 ай бұрын
Lower your input?
@aga58977 ай бұрын
@@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.
@ramsin.7 ай бұрын
Interesting, good to know. So basically the amp *has* to be pushed to 600w...
@aga58977 ай бұрын
@@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.
@wisehomo7 ай бұрын
@@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!
@mrtechie68108 ай бұрын
I happen to have a 48V power supply (UPS / battery - 45-58V). How would I change the design to produce 250 watts out?
@BarsMonster8 ай бұрын
Reduce input power?
@mrtechie68108 ай бұрын
@@BarsMonsterok, but would a 300 watt design be cheaper to build and more efficient to run? Perhaps using one MRF300?
@aga58977 ай бұрын
@@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.
@wisehomo7 ай бұрын
@@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.
@jameshansen39842 ай бұрын
@@mrtechie6810 You could use two MRF150 devices, but you will have to redo the output transformer for proper impedance matching.
@mohamedlanjri10 ай бұрын
Is the output of the amplifier an SMA connector?🤭
@mrtechie68108 ай бұрын
No, the output is RF energy. 😊
@aga58977 ай бұрын
@@mrtechie6810 Hahaha.
@machinetoolswarehouse11 ай бұрын
Nice work!. I have used PCBway in the past as well. I was very happy with their service.
@uprogc Жыл бұрын
The PA IMD must be measured with two tone (clean) signal, not with one tone.
@VityaKoresh Жыл бұрын
Так кто лучше?
@chronobot2001 Жыл бұрын
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.
@sreekumarg Жыл бұрын
Hi ... Can I get the Gerber file ? Regads
@a.v.stechs9398 Жыл бұрын
Can I use with hand hold walkie talkie
@g0fvt Жыл бұрын
Very nice project, well done, the MRF300 is a very inexpensive way to make that level of RF.
@nbookie Жыл бұрын
This is what Arnold does in retirement?
@abbyck10 ай бұрын
Lol
@BD4CB Жыл бұрын
GOOD JOB
@alsanderson4917 Жыл бұрын
Beautiful amp.
@simonkirby5724 Жыл бұрын
What is the 12v bias amp needed?
@HighlanderMcLeod Жыл бұрын
Up! :)
@HighlanderMcLeod Жыл бұрын
Hello! UB3AXZ is here :) 73!
@shopcubebikeparis34172 жыл бұрын
FB do you have the version with 4 MRF300 1KW? BEST 73
@reedreamer95182 жыл бұрын
I like it!
@Davidsmith2182 жыл бұрын
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
@aga58977 ай бұрын
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)
@FloRin...2 жыл бұрын
Eu sunt din Barlad :))
@vu3mes2 жыл бұрын
Are you making these AMPS commercially?
@JohnUsp2 жыл бұрын
Just the MRF300AN & MRF300BN transistors cost more than $120!!!
@mrtechie68108 ай бұрын
@@JohnUsp So? That is an ok price for this level of power. I would like to build a 250 watt version.
@HB9GZE2 жыл бұрын
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).
@johncundiss90982 жыл бұрын
Question. What heat sink compound did you use? did you solder the transistors to the heat spreader?
@Aleziss3 жыл бұрын
so no low pass filter board is needed ?? do you happend to have the controler board also ?
@MrTalaue2 жыл бұрын
Why do you think that?
@Aleziss2 жыл бұрын
@@MrTalaue uhm... because I did not heard him talk about low pass filters... that's why...
@MrTalaue2 жыл бұрын
@@Aleziss He did not talk about a T/R switch or a cabinet either.
@Aleziss2 жыл бұрын
So... As he did not talk about any of those things either... Does it need a low pass filter?
@MrTalaue2 жыл бұрын
@@AlezissDepends on the regulations in your country. In Germany -40dB are required and that linear is 5dB better.
@liaowei12343 жыл бұрын
You promised to send back my two A600 boards in January, where are they now?
@marklowe74313 жыл бұрын
Absolutely talented.
@nicolalamotta95543 жыл бұрын
hi can you tell me where i can find the arduino codes for the lcd sreen?
@garyheald47042 ай бұрын
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!
@JamesCutlervk2tim3 жыл бұрын
Arnold Schwarenegger making linear amplifiers.....awesome!
@vne23283 жыл бұрын
Amazing voice and nice amp!
@stancohen8453 жыл бұрын
Dumb newbie here - I don't see a control head. Ow do we control this and do I need a separate antenna tuner or is that built in?
@henrycross87763 жыл бұрын
This guy sounds like Darth Vader......cool 73 de kg0tr
@k2icc3 жыл бұрын
Any literature and part numbers to build one? 73
@doceave3 жыл бұрын
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.
@petrsuchomel96392 жыл бұрын
Probably parasitic oscillation. Check the feedback. I had similar problem with MRF300's (my own brew)
@Isochest10 ай бұрын
@@petrsuchomel9639It sounds like parasitic oscillation.
@bloguetronica4 жыл бұрын
Great design!
@valamerkozlowski79154 жыл бұрын
the harmonic performance is not realistic at this power output level. It is a snake oil to me. Unless it is a narrow band design
@RickGreenPhoto4 жыл бұрын
Please sell this a s a kit! It looks like fun to build, Great work.
@TelstarElectronics4 жыл бұрын
How many devices did you lose in your development?
@johnc34034 жыл бұрын
He lost a whole lot less than I would that's for sure.
@TangRev4 жыл бұрын
Hi I just started using Ft8 and stumbled across your video. Do you use and sound controllers between the tablet and the radio e.g. signal link? If not I would love to know the details on how you connect to the ft-817 directly. Means you need to carry less equipment. Thanks in Advance Trevor VK4MAX
@tvnteleviziuneaneamt64094 жыл бұрын
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
@markpedretti37654 жыл бұрын
where to buy toroids?
@pedrowyns92044 жыл бұрын
You have no email contact details on your website. I guess you are located in the UK. How about VAT if shipping to Europe mainland. Want to order the 600W amp kit but I need info on this. [email protected]
@VictorR3KR4 жыл бұрын
kzfaq.info/get/bejne/hNShgNJ6uNbFh6c.html
@VictorR3KR4 жыл бұрын
kzfaq.info/get/bejne/l62Ddpiqy9HRY3k.html
@letitrotfuckit4 жыл бұрын
where can i buy it?
@prizeking16474 жыл бұрын
Is the power 300 watts on fm ?
@nicolaebostan79714 жыл бұрын
Razvan buna. Sunt incintat fii amabil da-mi te rog un mod de contact er1zz. Bravo, mersi.
@costamina85004 жыл бұрын
Proasta satului....,,milioane de victime'' sau de adepți? Blonda tot ,,blondă''