QRZ Forums. Last edited: Apr 9, W9GBApr 9, We are extremely excited about the possibility of combining two great portfolios of complementary products and technologies into one powerhouse semiconductor company. The two companies' portfolios overlap primarily in only one area, RF power products. All other product families are expected to complement each other very nicely.
We are committed to our growth product lines and look forward to becoming the largest automotive semiconductor company on the planet and the fourth largest semiconductor supplier in the world. Last edited: Apr 15, W9GBApr 15, Jim's work is outstanding. His electronics are second to none. He does his own sheet metal work too!
I would love to have one of his amps on every band. K6CLSApr 15, Hello what is the real power and absorbed? It is connected to a Larcan 1. AA7QQJun 25, Requires 1 to 1. Sorry, that is the 6 meter amp, but you can check out the 1. Thanks i looked the second e third harmonic, always remain high, too bad, this is the characteristic of ldmos.
AC0HJun 29, I built up a pair of 6 and 2 meter amps from Jim's kits.
AH6LEAug 1, I have built a pair of Jim's HF pallets in parallel and used his combiners. Initial tests are outstanding! His products are great!As an exercise in milling and turning, I decided to have a bash at making a 0 degree six-quarter-wave 3dB ring hybrid to use with a pair of DF9IC W 1. It was huge fun, although if I charged my time I think it would be scarily expensive! Starting from a piece of x 25 aluminium bar, I turned a giant Polo mint, then used a rotary table on the mill to remove a According to a simulation using ATLC2, that would give Made up a jig from an aluminium plate so the outside diameter matches the required ID of the ring.
Brass plug turned to match ID of tube and bolted to the edge of the disk. During the build, I snapped off the 7mm pin from the DIN socket, so had to drill the pin and the back of the socket and insert a 2mm copper tube, which was then soldered in place. I milled flats at 60 degree intervals and drilled 4mm clearance holes for the centre PTFE sleeves of the N sockets, and tapped 3mm mounting holes.
I made 4mm tapped holes and 16mm clearance plus a stepped indent for the DIN socket. Had to shorten the cap screws by screwing them into a tapped plate, bandsawing them off and touching them on the grinder. To ensure the centre conductor was exactly in the correct position for drilling and soldering, I made up some spacers, which were pushed in to the groove.
I set up some springy wire to ensure the tube was held in tension and then clamped the spacers with some 2 inch Kant Twist clamps. The 2mm tubes were soldered to the each of the sockets and cut to length. The tube was drilled through the socket centre hole.
The 2mm tubes were pushed through and cut to length, then soldered to the ring. Firs measurements show the balance is OK to 0. With 15dBm in, I got Input return loss to the DIN port was worse than I expected, at I need to investigate that more closely.
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. The ring was soldered using a blowtorch, although I think the 75W iron would have done it OK.
Spacer detail — Spacer in place, ready to clamp The 2mm tubes were soldered to the each of the sockets and cut to length.It is especially very convenient for DXpeditions and similar traveling events as well as for station use. The RF matching is based on novel design which provides very good efficiency.
Harris Amplifier (Original Design)
The power supply is using the latest high efficiency technology, a light weight resonance power supply. You can leave it standby infinitely because it is consuming only 6 watts and it is completely silent after cooling down.Quadro rtx 4000 vs p4000
This is convenient in remote use. It supports parallel BCD, serial band data and analog band voltage. It withstands wrong band antennas, open or short circuit in the RF output and accidental impedance transients. Thus if your antenna SWR is too high you can continue working by lowering the power. There are only necessary push buttons in the front panel. Firmware update is easy with built in bootloader and a PC.For dust you are and to dust you will return meaning in hindi
See the terms. The lead time is one week. We accept PayPal and bank transfer. Don't hesitate to contact if you have any questions. Send email to. Back to JUMA main page. User Manual Version 1. Copyright jumaradio.QRZ Forums. AF6LJJun 7, KV6OJun 7, AF6LJ likes this. W0AATJun 8, Remember, I need to monitor amp output and reflected power while connected to the antenna! That rules out the various bolometers etc.
At the high power and reflected power levels I do not need high accuracy, I do need accuracy setting up the transverter output to the driver amplifier stage. AF6LJJun 8, I would recommend the following: Use an attenuator between the transverter and the driver, and adjust the attenuation value so you cannot damage the driver stage.
For these frequencies, a piece 9m of RG makes a very good 8 dB attenuator. Connect more attenuation, 20 dB, before the power meter and the driver output, and repeat the procedure until you have nominal driver output. UT or similar should handle at least W CW at the duty cycles that can be expected in amateur operation. Connect the thermal power meter head to both the forward and reverse coupled lines noting the levels, and repeat with the coupler reversed. Now you have a calibrated directional coupler with known forward and reverse coupling factors together with some estimate of the directivity.
Connect your other, own or borrowed, power meter URM or Bird or whatever also in series before the load Read the actual forward power output by adding the coupler forward coupling factor to the thermal power meter reading. Make up a calibration table for the "other" power meter by noting the deflection for various power outputs.
23cm power measurement options
If you have borrowed the power meters, return them undamaged to their owners. Of the shelf, made for the job reliable. Not some cobbled together mess! This amp may one day be a part of a portable eme station so I need rugged.
Looks like Bird is my best bet followed by Coaxial Dynamics. I can get line sections and raw meters W0AATJun 9, Well, your call. One preferred solution would be to use a dual line section with one W forward "slug" and a 50 W "reverse" slug, and either try to find the scarce Bird cross-needle movement, or use two meters for reading both directions simultaneously.More power — Higher voltage enables higher power density, which helps reduce the number of transistors to combine.
Faster development time — With higher voltage, the output power can be increased while retaining a reasonable output impedance.
Manageable current level — Higher voltage reduces the current losses in the system. Wide safety margin — The higher breakdown voltage of V improves ruggedness and allows for higher efficiency classes of operation. Samples available In production now. Samples available in Q4 Production in Q1 MRFX series is designed for ease of use. For samples and further requests click here. Higher Power. Ease of Use. No compromise.
LINEAR AMP Amplifiers
MRFX Series. Fewer combining losses, smaller PAs, simpler power supply management. Close More power — Higher voltage enables higher power density, which helps reduce the number of transistors to combine.
Easier matching to 50 ohms; transistors can be used wideband. Close Faster development time — With higher voltage, the output power can be increased while retaining a reasonable output impedance. Little to no retuning from existing 50 V power amplifiers.
Fewer stresses on DC supplies, better system efficiency, less magnetic radiation. Close Manageable current level — Higher voltage reduces the current losses in the system. Better reliability, higher efficiency. Close Wide safety margin — The higher breakdown voltage of V improves ruggedness and allows for higher efficiency classes of operation. Want to see more? Visit our RF Power Transistors web site.Waw, what a device.
The datasheet has a section dedicated to MHz, this makes construction easy. I should point out that this project would not have been possible without the [design] effort of many others. I just bolted it all together, but in my own particular way.
However after I finished construction it stopped working.
Although the amplifier was in effect a rebuild of the Harris amplifier, it still took hours weeks of effort to build. This was mainly down to the fact that it was a high power amplifier, not only in terms of RF power but DC power, I needed to make sure everything was right first time round by testing each stage and refining it, failures can be extensive and costly.
In addition I also pushed myself with some of the metalwork, this is all about learning after all. The front panel alone called for quite a few holes, 3 of them being large and close to each other. In addition to the big holes I fitted a bunch of LEDs along the front so I could see the status of the amp, a rotary switch for the meter and a mains power switch.
This is the grid of round holes on the bottom left. It starts with marking out the grid in 10mm squares, then munching every second one, which is the pattern to drill. An update I done vs. In the original Harris amplifier it was mounted on the back panel meaning whenever i wanted to remove the back panel I had to disconnect the wiring from the connector which was quite tedious, and potentially quite dangerous with it being v wiring which needs to be defect free.
As mentioned at the top this project is only me assembling, the PCB and parts was obtained from RFParts who sell all you need. I already had a heat sink and bought a PA device from another contact at a cheaper price. However some components are not supplied but are listed in the schematic. So I purchased them from RS Components. Note the modified BIAS is in the top left. Here are a few points learnt when investigating the assembly of the PA board, I mention them here for others to take note of.
Firstly, ensure that you mount C7,8,9 and C10,11,12 on their sides bunched up together so there are no gaps, this ensures that that RF does not flow through unevenly through them. If you think about the RF and voltage levels, any gap between components could result in a difference in levels to develop.
The image shows C7 to C12, not the other capacitors have their markings shown whereas due to being mounted sideways, the markings are not visible on C7 to C12 as they are on the side in relation to how the photo is taken. This could be done by building up enough solder to bridge the gap, or, as I have done but is not clear in the image aboveuse a small piece of copper plate to bridge the gap between the braid and the opposite edge of the PCB pad to the capacitors.
If the coax braid was soldered to the capacitors then it would likely lead to them fail due to cracking. Any mechanical stresses or shock on coax 3 bending to fit into a box for example will transfer down the coax to the capacitors, which are not designed to be mechanically stressed and are expensive. The Freescale reference PCB is supplied with a very basic bias circuit, this means the bias current, IDQ, might not be correct after assembly. To ensure IDQ can be set to required value the input bias circuit can be enhanced.
The bias enhancement requires a only a few components, the schematic is below. I cut my PCB with a Dremel but a knife could also be used. It is also worth mentioning that the IDQ can vary from 2.Cu 379 lnd
These parts were added to control a rise in idle current as the transistor heated up on long transmissions. The critical part of any high power amplifier is dissipating heat, i.Gz 48s
I keep bringing up the whole MTTF thing but it is so critical to any amplifier design, I would go so far as to say it is the foundation of any good design. So with that in mind a recommended method to dissipate heat as effectively as possible, is to mount the PA device onto an intermediary copper plate which is then mounted onto the heat sink proper.
The copper plate allows the heat from the PA device to spread out further than just the footprint of the PA device and dissipate into the main heat sink over a greater area. Why do I mention surface ground? Well it means Bert grinds the copper plate perfectly flat to ensure the interface between the copper plate and heat sink is as efficient as possible with no gaps or ridges between them, again ensuring the best possible heat transfer and increase in the MTTF.
Freescale also have a mounting method which clamps the transistors where the clamp applies pressure to the centre of the device, the Freescale AN application note describes mounting RF transistors, it contains this very telling diagram.
Well you use a griddle pan and a gas hob of course!Microwave Equipment of. Way up above our UHF allocation lay the microwave bands. In Australia Amateurs have access to the 23 cm Band 1. Operating at these frequencies is a real challenge — but success brings real satisfaction! The majority of these bands require you to build your own transmitters, receivers and antennas. The other challenge at these frequencies is in the nature of propagation.
Amateur Radio continues to be a major data collection tool in determining how microwave signals get from Point A to Point B. Water — moisture in the air, and clouds — becomes a factor.
Some Amateurs in France and Italy have established a path over the mountainous non line of sight border by bouncing signal off glacial ice on Mont Blanc! In short, there is plenty of pioneering work available in the microwave bands. For my part, I have microwave equipment in various stages of completion for the bands between 23 cm and 3 cm; 23 cm and 13 cm are operational, whilst the other three bands require a little work.
Below are pictures of my first MHz transverter. In its current form it is capable of generating 28 watts on transmit, and hearing signals down to about dBm. This is a block diagram showing the modules and the RF signal paths between them. While the two Mitsubishi M power amplifier modules are rated at 10 watts, they can be run to slightly higher levels before saturation or distortion takes place. Mine are ok to 15 watts, but I tend to run them at about 14 watts each.
I originally used a single watt power amplifier module, and a small case for the modules. When I started exploring the long distance AEP paths, I wanted to try 23cm as well as and MHz, and decided a little more power would be a good idea. This meant a far bigger heat sink, and a larger sturdier case to mount it all in — I also had to find room for the associated splitter and combiner modules.
On the left is the view of the upper compartment. On the right is the view of the lower compartment, showing 1 Transverter, 2 1 watt power amplifier, 3 Splitter, 4 Combiner, 5 Power amplifier and heat sink assembly and 6 MHz antenna connector. On the left is the rear panel with the two M PA modules mounted on the heat sink, with the brass RF shield in place over the nearest module.
Hardline is used to connect the outputs to the combiner.
On the right is a topside view of the actual transverter module, with 1 MHz IF in and 2 out using the black coax and 3 the Local Oscillator signal via the light brown Teflon coax on the left side of the board; and semi-rigid coax carrying the MHz signal 4 in and 5 out on the right side of the board.
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