Good morning to all Oms and Yls! I have been using a Zoli amplifier like this for several months! It works reliably and without problems. A high-quality work and also looks great ❤️ Thanks to Zoli for this work and to whom he put all his skills and heart and soul into it. The amplifier is light in weight and you can easily find space for it in the shack. The only thing I don't like is the volume of the fan... but because I'm constantly working with headphones, I hardly notice it. Overall a super great device, well secured against any incorrect operation by the operator‼️THANK YOU ZOLI👍
Zoli is a fine ham, lots of creativity and very helpful in every respect. I figured that from a recent exchange I had with him. Best wishes and 73's to him, my friend, de Sid, VK2SID
wow! excellent job, well done! Years ago i built a 2 x 4cx250b valve amplifier in push-pull configuration for 2m. It had 2.5kV on the anodes and was force cooled with a large snail blower fan! This looks much nicer and safer! 73 de G6PHF
Well done, fella. It must have been an emotional moment making that first QSO and getting a great report....really, well done, indeed. 73 de CT7/ZR1XZ Geoff
Nice amplifier!, I'm glad to hear the voice of IZ2ZSF Stefano. I talked to him several times before. I hope to see you too on the radio. Good luck and good dx... de HL1SB
Very nice amplifier ! I got that board somewhere, waiting to get built ... Tube amplifiers do not need to be quite so Huge - take a look at old Zetagi stuff.
@@hg7an_ham_projects Weight is an issue with tube amps but they can be silent ! Look up EX8A's GU-81M amplifier - 3kW no ventilator fans. I'm building a 350W tube amp (2x GU-19) right now, to see how small i can make it. After that i will build the 2xLDMOS 600W amplifier using MHT1803 devices. They are the same as the MRF300 but a lot cheaper. ea7knw
Thank you for the kind words! I will plan to display the details on my web page. But due to my other ongoing projects, I'm a bit slow with documentation. 73, Zoli HG7AN
@@hg7an_ham_projects I realize that you use DSP-7-PA module. Could you let me know where to purchase this controller either kit or fully assembled. TU, 73, VE6AKN.
excuse my ignorance but why MRF300 devices are rated to withstand 65:1 SWR and all amplifiers I see are protected to 2:1 ? I even see amps running full power with coax cable being cut with no damage to transistors ? why such tight protection on SWR ?
Dear Aleziss, Actually, the accepted limit for RF power amplifiers is 3: 1 swr. In this case, 25% of the output power is reflected from the antenna connection point and must be dissipated by the amplifier in the form of heat. The purpose of the amplifiers is to deliver 100% of the power through the antenna. In addition, the cooling of the amplifiers is designed in this way. In the case of 65: 1 swr, 94% of the output power must be dissipated in the amplifier in the form of heat and only 6% goes out to the antenna. There is no point in operating the amplifier with such a swr. 73, Zoli
@@hg7an_ham_projects thanks I undestand that running an antenna at 65:1 is not worth it, my initial question is why keep the protection so low when the device can withstand 65:1. So by what I undestand, it is a heat problem that prevent amps to accept hi swr correct ? I did not meant so it could handle 65:1 but 5:1 or even 10:1 wouldn't be a problem if there was a proper cooling system, the ldmos could handle that 10:1 no problem right ?
Dear Aleziss! If you use Ldmos at maximum power (for example, you drive the Mrf300 with about 300 watts out of it), it's not because the fet can't dissipate the extra power that comes back due to that bad swr. If you use fet at low power (e.g. 150w), it will withstand higher swr as well. 73, Zoli
@@hg7an_ham_projects ok another person also mentionned that the capacitors and dozen of relay contacts in the filter board might be damaged when they are subjected really high voltages due to impedances way out of 50ohm, that way I could undestand that the filter board might not handle the high swr but the transistors could survive... thank you for all your replies
Hello, a year ago I ordered most of the parts from the mouser and the LCD from https: //eckstein-shop.de. However, there is now a global shortage of integrated circuits that it is impossible to obtain all the necessary components. Unfortunately, this is the sad reality ... 73, Zoli
For the 7 inches LCD touch screen display that is excellent and I have strong interests to buy one for my DIY 1KW HF Amplifier, could you advice the seller for the purchase details ?
Dear sir can I make to it I can purchase everything to ebay but I have no idea related to this amp I just search Long distance communication amplifier for my radio
Hi, my friend and I made the box. But if you have to, I'll make you a box or a complete amp. I just finished with the 1KW version, but I haven’t had time to upload a video of it to youtube yet. In a few days, maybe I can do it ... 73, Zoli HG7AN
@@hg7an_ham_projects I am a dissembled veteran with programming and electronics background. No longer work due to that, so I am planning to set up a nice space I got for home brewing. Vey interested in LDMOS, so I can assemble myself, but most important, learn and practice the whole design. Already done Arduino stuff too. Looking for reference materials, guidance from experts like you, etc. Planning to do the same for all bands, such as HF, and 23 cm, 2 m, etc. Thanks.
Zoli, Congratulations on the project, I already have the amplifier with the mrf 300 but I would like to put an lcd, you use arduino, what screen do you use, thanks, manoel py2wg
Hi, I received your email about this video. I don't find the amplifier on your website. Do you have a price yet? Ordering details? Thanks and 73, Frank K4FMH
Dear Frank, the price is about 1900USD+post cost. But I don’t know the other terms of posting (like customs) because I’ve never sent something of this value to the US. But it can certainly be solved in today’s global world. Thanks and 73 Zoli
@@hg7an_ham_projects Thank you for the information. Although the manual will be later, please post the technical specifications when you have them compiled. Very interesting project!
![BLACK BAG - Official Trailer [HD] - Only in Theaters March 14](http://i.ytimg.com/vi/Du0Xp8WX_7I/mqdefault.jpg)
Good morning to all Oms and Yls!
I have been using a Zoli amplifier like this for several months!
It works reliably and without problems.
A high-quality work and also looks great ❤️
Thanks to Zoli for this work and to whom he put all his skills and heart and soul into it. The amplifier is light in weight and you can easily find space for it in the shack.
The only thing I don't like is the volume of the fan... but because I'm constantly working with headphones, I hardly notice it.
Overall a super great device, well secured against any incorrect operation by the operator‼️THANK YOU ZOLI👍
Thank you Chris! I reduced the fan noise in the next version. I will make it in your amplifier as soon as I can do.... Best 73
Great looking FW in the controller.
Thank you! 😊
Zoli is a fine ham, lots of creativity and very helpful in every respect. I figured that from a recent exchange I had with him. Best wishes and 73's to him, my friend, de Sid, VK2SID
wow! excellent job, well done! Years ago i built a 2 x 4cx250b valve amplifier in push-pull configuration for 2m. It had 2.5kV on the anodes and was force cooled with a large snail blower fan! This looks much nicer and safer! 73 de G6PHF
Thank you very much!!! Yes, it works with 50V, so it is safer...if you would like to build an LDMOS PA then I can help you!!! 73 Zoli HG7AN
Well done, fella. It must have been an emotional moment making that first QSO and getting a great report....really, well done, indeed. 73 de CT7/ZR1XZ Geoff
Thank you for your great words!!!
Hi Zoli! It's also a great job just like your antenna analyzer.
Congratulations. HA5AQ, Tony
Dear Tony, many thanks...good health and best 73, Zoli
Nice amplifier!, I'm glad to hear the voice of IZ2ZSF Stefano. I talked to him several times before. I hope to see you too on the radio.
Good luck and good dx... de HL1SB
@@hl1sb_Philip-Yu Thank you, good luck and DX!!! 73 Zoli
Lovely amplifier!!! Well done Zoli! 73 de VK4QP
Many...many thanks!!! If you would like some part of it, then write an email to me: hg7an.zoli@gmail.com 73
nice build !
Thank you!!!
Very nice amplifier !
I got that board somewhere, waiting to get built ...
Tube amplifiers do not need to be quite so Huge - take a look at old Zetagi stuff.
Hi, thank you! Yes it is true. But I think tube amps generate too much heat and are noisier than solid state amps. Semiconductors are the future!!!
@@hg7an_ham_projects Weight is an issue with tube amps but they can be silent ! Look up EX8A's GU-81M amplifier - 3kW no ventilator fans.
I'm building a 350W tube amp (2x GU-19) right now, to see how small i can make it.
After that i will build the 2xLDMOS 600W amplifier using MHT1803 devices.
They are the same as the MRF300 but a lot cheaper. ea7knw
Amazing job ! Congrats! 73 de 9A3RU-Željko
Thank you, 73'
Amazing
Thank you, best 73 Zoli
Excellent!!!
Thank you, 73!
Amazing!
MNI TNX, 73 Zoli HG7AN
Very nice amp! I see in the comments that you're willing to build and ship, but are you willing to share the construction details and code?
Write an email what would you like to know, hg7an.zoli@gmail.com, 73'
Hi sir
How do you make the swr meter in that display hardware
73 de vu3cpf
@@anandakrishnanVU3CPF Hi, I made it with directional coupler. Happy new year! 73
Linear muito bonito e eficiente , quanto custa amplificador.
Obrigado, escreva um e-mail curto e eu escreverei os detalhes em resposta: hg7an.zoli@gmail.com
This is great project. Well done Zoli. Wonder if you can share this project on your web site. I like to build one like this. 73 from Vinh, VE6AKN.
Thank you for the kind words! I will plan to display the details on my web page. But due to my other ongoing projects, I'm a bit slow with documentation. 73, Zoli HG7AN
@@hg7an_ham_projects I realize that you use DSP-7-PA module. Could you let me know where to purchase this controller either kit or fully assembled. TU, 73, VE6AKN.
According to my information, it cannot be purchased. You have to build it. 73, Zoli
Send a short email to me (hg7an.zoli@gmail.com) and in my answer I will send personal info for you.
It is very nice looking display with touch screen. I guess it is from Nextion?
Hello, thank you. The display made and proposed for arduino projects. Best 73!
excuse my ignorance but why MRF300 devices are rated to withstand 65:1 SWR and all amplifiers I see are protected to 2:1 ? I even see amps running full power with coax cable being cut with no damage to transistors ? why such tight protection on SWR ?
Dear Aleziss, Actually, the accepted limit for RF power amplifiers is 3: 1 swr. In this case, 25% of the output power is reflected from the antenna connection point and must be dissipated by the amplifier in the form of heat. The purpose of the amplifiers is to deliver 100% of the power through the antenna. In addition, the cooling of the amplifiers is designed in this way. In the case of 65: 1 swr, 94% of the output power must be dissipated in the amplifier in the form of heat and only 6% goes out to the antenna. There is no point in operating the amplifier with such a swr. 73, Zoli
@@hg7an_ham_projects thanks I undestand that running an antenna at 65:1 is not worth it, my initial question is why keep the protection so low when the device can withstand 65:1. So by what I undestand, it is a heat problem that prevent amps to accept hi swr correct ? I did not meant so it could handle 65:1 but 5:1 or even 10:1 wouldn't be a problem if there was a proper cooling system, the ldmos could handle that 10:1 no problem right ?
Dear Aleziss! If you use Ldmos at maximum power (for example, you drive the Mrf300 with about 300 watts out of it), it's not because the fet can't dissipate the extra power that comes back due to that bad swr. If you use fet at low power (e.g. 150w), it will withstand higher swr as well. 73, Zoli
@@hg7an_ham_projects ok another person also mentionned that the capacitors and dozen of relay contacts in the filter board might be damaged when they are subjected really high voltages due to impedances way out of 50ohm, that way I could undestand that the filter board might not handle the high swr but the transistors could survive... thank you for all your replies
Can you provide where you sourced all the parts from? Love the display.
Hello, a year ago I ordered most of the parts from the mouser and the LCD from https: //eckstein-shop.de. However, there is now a global shortage of integrated circuits that it is impossible to obtain all the necessary components. Unfortunately, this is the sad reality ... 73, Zoli
For the 7 inches LCD touch screen display that is excellent and I have strong interests to buy one for my DIY 1KW HF Amplifier, could you advice the seller for the purchase details ?
Hi, please write an email to my email address:hg7an.zoli@gmail.com and I can write info direct to you.
its very nice amplifier its sufficient power 600W. but Screen is very fast. 73'
Thank you very much, 73!
1:40 At the peaks the display shows 100% efficiency, do you think this is real ?
Thank you! No, the efficency is lower then 100% ofcourse. I will correct it. 73!
Nice linear. 👍👍👍 73 PE2HLA
Thank you very much, Best 73!!!
Can you purchase the metering system Thanks Harry KB4HL
Hi, I made it, write an email and we can change information about it. My email: hg7an.zoli@gmail.com
Dear sir can I make to it
I can purchase everything to ebay but I have no idea related to this amp
I just search Long distance communication amplifier for my radio
Hi, please write an email to me and we can change information. My email hg7an.zoli@gmail.com 73,Zoli
Where can I buy one? ❤
Hi, write an email and I write about details: hg7an.zoli@gmail.com
Is the case home made too or any recommended place to place custom orders? Thanks.
Hi, my friend and I made the box. But if you have to, I'll make you a box or a complete amp. I just finished with the 1KW version, but I haven’t had time to upload a video of it to youtube yet. In a few days, maybe I can do it ... 73, Zoli HG7AN
@@hg7an_ham_projects I am a dissembled veteran with programming and electronics background. No longer work due to that, so I am planning to set up a nice space I got for home brewing. Vey interested in LDMOS, so I can assemble myself, but most important, learn and practice the whole design. Already done Arduino stuff too. Looking for reference materials, guidance from experts like you, etc. Planning to do the same for all bands, such as HF, and 23 cm, 2 m, etc. Thanks.
Beautiful
You are extremely talented!
But i prefer 1 kw
500 too low 2 kw too high
I like 10 db 😂
What are you using for power supply ? Flat pack 2000?
Thank you very much, write an email to my email address and we can change more information: hg7an.zoli@gmail.com
Oi! Meu nome é Luis Brugnagox, estou no Brasil , você poderia fornecer uma placa desse amplificador de 1200W com as peças , componentes
Hello, please write your email address or write an email to my email : hg7an.zoli@gmail.com
Great work! Happy to see you're making use of the boards from qrpblog.com/shop/ . All the best, Razvan M0HZH.
Hi, thanks. Your boards work well...73
did you build that custom controller yourself ? it seems a lot different than what world electronics has
Yes, it is different, I built it. 73'
@@hg7an_ham_projects interesting, nice work seems really well done !
Thank you, good health and best 73'
Zoli, Congratulations on the project, I already have the amplifier with the mrf 300 but I would like to put an lcd, you use arduino, what screen do you use, thanks, manoel py2wg
Thank you, the display is a 7-inch touchscreen LCD recommended for arduino projects...
Sou do rio( brasil)
Hi, I received your email about this video. I don't find the amplifier on your website. Do you have a price yet? Ordering details? Thanks and 73,
Frank
K4FMH
Dear Frank, the price is about 1900USD+post cost. But I don’t know the other terms of posting (like customs) because I’ve never sent something of this value to the US. But it can certainly be solved in today’s global world. Thanks and 73 Zoli
@@hg7an_ham_projects Thank you for the information. Although the manual will be later, please post the technical specifications when you have them compiled. Very interesting project!
Csinál
Tubes are cheaper
I am not sure, but tubes too hot and noise the cooling...Fortunately, the choice is everyone's free right! 😊😊😊