2m vhf amplifier kit
QRZ Forums. Has anyone got a link to a 2M kit?? Thanks for your help! Or, you can buy that stuff separately as needed. I wonder, are there any more?
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500W Mrf300 LDMOS 144 MHz 2m linear amplifier kit ( NO MOS tube)
Many QRP rigs are capable of 5 or 10 watts of power, this is often enough for data mode DX, but sometimes you just need more punch to get heard on SSB. This page will show you how to build your own Watt linear amplifier based on the kits that can be found on the various internet auction sites. I initially tried making a 45 Watt amplifier kit but could not get this working or find anybody else that had managed to get one working!
So I decided to try the Watt amplifier kit. I found this Watt amplifier to be of a much higher standard than the 45 Watt kit, There are also lots of references to the watt kits on the internet. Therefore, this was the kit chosen to support this linear amplifier build project. These amplifier kits are relatively cheap and are quite common on the internet. They can't be used as they are, a low pass filter and other items will also be needed to make this a practical piece of radio equipment.
This project will utilize a standard Watt linear amplifier kit, a low pass filter, and other ancillary items to make a usable, boxed linear amplifier to suit a 5W QRP rig. There are issues with this project, there is no high SWR, overheating, reverse polarity or other protection mechanisms built in. So it needs to be used with care. It's not going to be as refined as a purchased professional kit like the HardRock 50 or the Juma PA kits. But it should be fun to build and certainly less expensive.
Most of the parts needed to build this amplifier are available from the normal online auction sites. Along with the wanted frequency, the amplifier can also produce other frequencies due to harmonics.
These unwanted frequencies can cause out-of-band interference which is obviously undesirable. A low pass filter will attenuate these unwanted frequencies down to a negligible level.
For this project, we have chosen a four-band LPF. A rotary switch is used to select the desired operating band, the selected band is shown via an LED indicator. My kit came with all of the fiddly SMT devices pre-fitted. No instructions were included, but the remaining parts were pretty straightforward to identify. The kit arrived boxed and all the parts appeared new and to a high standard, the mosfet device may have been a reclaimed part used in the past.
You could save yourself the bother of building the amplifier for a little bit more costs. Built and tested amplifier boards are available. You'll still need to connect it up and add the LPF. So there is not much time to be saved with this option.
You'll need to refer to the Watt amplifier images when making this kit. This will help identify components and how to make up the indutors etc.. I covered the enclosure with masking tape to protect it while drilling and cutting.
The holes we're marked out, drilled and de-bured as needed. The hardest job was cutting the aperture for the main PCB so it can sit on the heatsink through the lid of the box. The outline of the heat sink aperture was drilled out, then the rough edges carefully filled to shape. Heatsink tip: Don't drill all the way through the base of the heat sink into the veins.
It looks awful and will snap your drill. Use shorter holes and screws or a heatsink with a deeper base. The amplifier board was mounted through the lid of the box. The hole for the amplifier board was cut out by drilling out the basic square shape with multiple holes, then filing to size. I connected the amp to a 50 Ohm dummy load and my FT I applied It worked Then it got hot and went pop! A replacement power transistor was ordered, I replaced the faulty part and tried it again.
Do not connect this amplifier directly to a 5 Watt radio right away, 3 Watts should be the maximum delivering around 50 Watts output, you'll blow it up if you go straight up to 5W.
Start with a 1 Watt and work up from there. This will protect your amplifier from SWR issues and high input spikes. Connected to my FT the amplifier works very well. I was able to control the power via the FT output as expected. I obtained a maximum power of about 70 Watts from the amplifier which seemed fine for initial testing. I then progressed to live data modes and made a number of contacts. The amplifier would get hot on the higher power settings, but at lower setting, I found this not to be such a problem maybe a small fan is needed?
The fascia was printed on sticker paper using a regular inkjet printer. The amplifier works, it's great fun to build. However, the lack of SWR protection turned out to be an issue when trying to squeeze out the higher power.
Although the amplifier can withstand an SWR of , I still managed to blow up the power transistor a number of times. The use of automatic antenna tuner initially caused me problems, just running through the tuning cycle was enough to make the FET go pop. Reverse voltage protection. I haven't tried these protection ideas myself yet, but will do at some point in the future.
When I'm done I'll let you know! Contact us: radio adaptivebms. Make a Watt linear amplifier from a kit. Parts and tools required. Cutters and pliers Screwdriver Mobile phone with a camera, magnifying glass or great eyesight. Low pass filter, why? About the amplifier kit. Build the Watt amplifier board. Drill and tap the heat sink Break out the inductor end plates from the PCB. You may want to file off any burrs. Place to one side. Lay the PCB on the heat sink. Lay the mosfet device on the PCB.
Mark the PCB mounting holes with a pen. Mark the Mosfet mouting holes as well. Remove the PCB and Mosfet device, centre punch the holes.
Drill the holes with a 2. Tip: Use a clutched drill on a low slip setting. Your drill bit will break if you do not do this. Tap the holes using a M3 tap. Bolt the PCB directly to the heatsink. No spacers. Tip: I layed some thin strips of insulating tape over the insulated tracks. Make the inductor windings: Push the tubes through the ferrite cores. These tubes make the 0. Place these parts on the PCB and tack solder in place. When you happy fully solder in place. Check continuity at this point.
Wind the wire through the ferrites and terminate. The small ferrite has two windings, the big ferrite has three turns. Populate the board: Fit the remaining parts The Mosfet device is grounded by the heat sink.
I used thermal path grease to aid heat dissipation Check and buzz out your work I dripped some candle wax on the ferrites to stop them from rattling about Adjust the biasing as described in the next section. Adjust the biasing. Careful check and adjust the biasing as follows: Connect the amplifier to a 50 ohm dummy load Using a current limited power supply, apply Adjust VR1 to have 2. Make the box.
When all the components are fitted to the enclosure the amplifier is ready for wiring. Always test for shorts before switching on! Using the amplifier - Keep the input power low, very low! I then managed a couple contacts SSB on 20 Metres with no complaints. I'll now refine the setup and continue to test Finishing off.
Linear Amp Gemini 2 144MHz 300W Solid State Linear Amplifier
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100w vhf amplifier
The company HobbyPC sell a band pass filter for 2M, 1. Do you guys have any updates on your amped up limesdr? The PA deck is fine. Once I figure out the signaling into it, I will slap it all together. I have ordered two of the Power Amplifier Kits and heatsinks and waiting for their arrival. Do you have the assembly instructions? I cannot find them online and the link given goes off to some other place.
Island Amplifier USA
It is available in two versions one with and one without top mounted fans. There is the ability to change the intensity of the backlight. The CPU keeps an eye on input power, temperature and VSWR and will if necessary disable the amplifier from transmitting if there is fault. Any errors will also be recorded and will be available for later recall for diagnostic purposes by either the manufacturer or his distributors. Weight is approximately 4kg.
Make a 100 Watt linear amplifier from a kit
All the amps dual band amps I see are max 8W input and designed for HT use. Any suggestions? Has anyone modified one of these amps to take a higher than 8W input. I am looking at Mid-priced amps like a Mirage or similar. I see a raft of Chinese dual band amps out there but all are low power input. I haven't seen any.
Band > Vhf (1/2)
The board also includes a low pass filter for strong suppression of the harmonics. Some minor comments can be said about the instructions and the way the components were delivered all in a bag without markings but in general this PA-kit is of very high value for the little money it costs. When mounted on a heat sink and connected to a 28V power supply and a good coaxial relay, like in the picture below, it makes a complete amplifier. Less than 1W of input is necessary to get the W out and there is space on the board for an attenuator to match a higher drive-level if that is available. It is also a good idea to disconnect the internal gate bias from the drain supply and let the former be turned on at TX while the latter could have its voltage always present.
2m 8W Amplifier +39dBm
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2m linear amplifier kit
RELATED VIDEO: MRF300 2 m power amplifier 144-148 MHz 500W from R3KRA premium membership for higher-level suppliers. Relevancy Transaction Level Response Rate. Supplier Types Trade Assurance. Supplier A premium membership for higher-level suppliers. Supplier Location. Order : OK.
Click here to visit the shop! Available for 80, 60, 40, 30, 20 or 17m bands. Read more: 5W CW transceiver kit. Read more: Ultimate3S kit. Both outputs have a range of approximately 3. A GPS receiver can be connected to maintain precise frequency output.
QRZ Forums. All the amps dual band amps I see are max 8W input and designed for HT use. Any suggestions? Has anyone modified one of these amps to take a higher than 8W input.
I agree with you, thanks for the help in this question. As always all ingenious is simple.