The Single Best Strategy To Use For LDMOS Amplifiers
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The lower move filter, Narda coupler and dual detector pcb have also been replaced with one assembly combining most of these elements; this mixture assembly can be set up for 6m, 2m, 222 MHz or 70cm. This subsequent photo exhibits the inside, the way I currently Make them.
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Soon after browsing around for more than 6 months I decided on getting my very first transistor amplifier. I wanted legal Restrict with headroom plus a in-built tuner.
I really did not plan to take a look at it at 1kw and not using a load, but it surely took place, and it locked out the amp much like it absolutely was alleged to do. No injury, even after I managed to make it happen once again about an hour later on.
A significant-recent FET swap, proven just to the correct of the large antenna change, gates the 50v VDD on the amplifier. This allows the control board sequencer to show it on and off at the correct times.
I also checked Energy Genius XL but he Expense is a lot of. I also checked out more mature amplifier such as the Icom PW-one making use of more mature engineering -- also fantastic but only 1KW. You are able to see functionality in QSK in this article: Operating from 240V in my shack, the amp temp under no circumstances rose above 43C; Contesting CW at lawful limit.
The latter employed the most up-to-date technology of devices however the amp only lasted 6 months of light responsibility before the finals blew. The tech admitted which the gadgets were improperly mounted at the manufacturing unit (sort of important at this electric power degree) and lined the repair underneath guarantee. One more few years as well as the finals blew once again. This time it cost $1100. I essential a backup plus the RF2K-S was it. Since the Flex amp integrates seamlessly with their SmartSDR program, I was concerned about the more intricate integration (a person requirements a different VNC program for distant operation). But it had been an unwarranted problem. I had it working in under an hour or so. I had to question one stupid query within the forum and it had been answered in below an hour or so. I've been working with this particular for any handful of months now and I'm really hesitant to put the Power Genius back again to the method. I think It is really my new backup. The benefit of this amp are many and are covered in a number of the other critiques.
The first Focus on the 2m amplifier Main was created and prepared up in Dubus journal by F1JRD, and far information and facts can be retrieved with an internet lookup on LDMOS Amplifiers his phone indicator. More info on This is certainly on F1JRD's Web-site. I designed the amplifier sub-assembly as documented there (with two or three insignificant variations), and it labored as released.
I invested many my engineering job building higher electric power solid state amplifiers for the VHF and UHF paging sector. I've numerous models under my belt. I very first ran throughout this amp quite a few a long time in the past at Hamcation. I was amazed from the Create high-quality but I have seen many a "really" amplifier at trade demonstrates so I didn't pull the cause. A few years Earlier I were released to this style of one.5KW+ equipment from Freescale (I had been in the amp enterprise) and experienced had a chance to play with them once they supplied samples. Amazing. Not attempting to tackle One more major job, I used to be waiting for one of many amplifier businesses to adopt them. I'd to attend several years along with the units went by way of a large amount of company restructuring. This past February, yet again at Hamcation, I bit the bullet and bought just one. In between the Hamcations I'd bought an Ameritron (pre-MFJ ... nice but using MRF150 equipment that happen to be approaching 20 years old), a Yaesu (important issues with their electrical power source), and And finally a FlexRadio Energy Genius / Tuner Genius combo.
When tripped, this element will lock the amplifier in bypass method until finally manually reset (principal energy needs to be turned off for quite a few seconds to reset it).
Anyhow, none of my lots of glitches has broken the amp. It Fortunately goes into Standby method. When that occurs, I determine the problem (can take me 2 seconds) And that i either contact over the Reset gentle button or merely touch the Run/Standby Digital button and I am back again in business enterprise. No waiting around.
Among the slight modifications I built (shown at left) was to work with a Dremel Resource to make a couple of a lot more pads away from a handful of much larger types on the higher still left with the board; I did this to connect supplemental factors for an adjustable bias circuit (the compact trimmer pot in the middle) for setting the proper IDQ.