Blf177 amplifier repair

JavaScript is disabled on your browser. Please enable JavaScript to get full benifit of e-Tenders. Login utility has been upgraded from Feb Please follow below steps:. Click Here For Details.

===

We are searching data for your request:

Blf177 amplifier repair

Wait the end of the search in all databases.
Upon completion, a link will appear to access the found materials.

Content:

• BLF177 NXP/PHILIPS TO-59 High-Frequency Tubes
• Design and building of a 300 W MOSFET Push-Pull Power Amplifier for 144 MHz
• NXP BLF8G22LS RF Transistors, SMD, NPN
• RF Power Transistor (BLF177, MRF151G, MRF373)
• PM5000 datasheet
• BLF177 PD57006 VERY HIGH POWER ,1x LDMOS BOARD LINEAR AMPLIFIER
• 1kW 1.8-30MHz 700W 50MHz HF POWER AMPLIFIER BOARD for LDMOS BLF188XR/XRS BLF188
• Blf177 Hf Pa
• Philips Power Amp Application Note

WATCH RELATED VIDEO: 9a3xz - 4x BLF177 amplifier

BLF177 NXP/PHILIPS TO-59 High-Frequency Tubes

Post by Radio Garfield » Wed Feb 01, pm. Post by Maximus » Wed Feb 01, pm. Post by Radio Garfield » Thu Feb 02, am. Post by Analyser » Thu Feb 02, am. Post by Radio Garfield » Thu Feb 02, pm. Post by Tec1 Post by Albert H » Thu Feb 02, pm. Post by Radio Garfield » Fri Feb 03, pm. Post by radium98 » Sun Feb 05, pm. Post by Analyser » Sun Feb 05, pm. Post by Albert H » Mon Feb 06, am.

Guides, charts, diagrams, etc. Exciter was faulty and after repairing it now I have to connect it to the amplifier. Before testing it with RF drive I checked the voltages. Power meter show no self oscillation. I have not any experience with blf I have built and worked a few blf amplifier before so I have few questions before firing it up.

This Ugs of 1,35V and accordingly Idq of 3,0 mA seems to be bit low? What do You guys think? Do You see any obvious problem on this board? What is the proper amount of RF drive, based on your experience, not datasheet? I saw that W should be enough 4. What procedure you guys want to recommend me for starting this amplifier with RF input? I see that people do it on two ways. Second way would be to apply BIAS determine Idq first , then apply RF drive from 0 to some value, watching the current and output power.

I was reading some instructions from Albert H, here on this forum, that 10A fuse is good thing to have. This amplifier have I hope that it will work for safety. Thanks guys. We can comment about mechanical work and few other stuff later. It seems that this transmitter was on few places before it came to me.

You do not have the required permissions to view the files attached to this post. This guy that sent me all of this lives in Germany and while on new year vacation here in Bosnia, sent to me shipment with this FM transmitter and this exciter that is now used for driver of amplifier.

Well, those videos tell much really. Power supply is different but this in the box is also good. Mean-Well But, since original exciter was faulty someone placed another one which is one that you see on the picture and installed 12V power supply for new exciter.

The person who was making these repairs did few bad jobs inside and that's way I am not sure in what condition is AMP-pallet also.

Since I don't have experience with BLF, like I said before, I decided to ask here for guide-lines, before powering thing up. Another problem was that, this complete box was not in use for long time and placed in some storage room with a moisture! I had to remove one of the input trimmer-capacitor. It was not able to move the plates anymore, welded somehow! My questions from first post still stands please. Sent from my iPhone using Tapatalk. I am not sure what else could be problem but I have no output power.

When adjusting the trimmers at input and that trimmer at output network I get to situation when about 15W goes out and that's about it! I use two power meters. Output stays at same level of that 15W and don't varies at all.

I am confused. I dont know is this any sign of faulty BLF or not? Can this same method be used on BLF ? I mean, increase gate voltage until I have, lets say, mA? I am stuck now. For some reason voltage drops down to about 20V and less when loaded. I noticed that green LED on power supply flickering and goes off completely when tuning.

As soon as the load increase, voltage drop is higher. When I used my own power supply amplifier gave signs of life finally. Phew, what a relief. Now I have to figure it out what is wrong with this Mean-Well. By cranking up the supply voltage to about 60V , I found that the gain increased, so that I only needed about 2. I used to have problems with the output transformer Teflon coax - I could get it to melt under some mismatch conditions!

The amplifier was based on the Philips design notes, and was completely broadband from 80 MHz to over MHz , and had no adjustments - other than the bias. I then discovered the Mitsubishi low voltage FETs and found out how to parallel them up. I've just done a PA with 8 of the 70 Watt jobs in parallel for Watts out. The efficiency of these things is insane, and I only had to get rid of just over W of heat. The only problem is the huge supply current, but I distribute so that each device has its own power input.

Albert H i would like to see a picture of 8 x 70watts in parallel with combiners or teflon transformers p;ease. The splitters are more hassle - they're small trifilar wound ferrites. They're fiddly to wind, but they work. The two PAs we built have left for the Middle East, but I expect to make some more for a client closer to home shortly. When we do the next ones, I'll make sure that I have some suitably anonymous photos to put up here.

The FETs are individually powered and their bias adjusted so that each stage develops 50 Watts - in fact they're done in pairs, for Watts, but the principle's the same. There's a further benefit to using distributed power like this - you can "lose" a FET or two, without massive degradation of the output power - this was the principle used with the old BBC Watt pallets with the pairs of TPs. I find that the biggest problems at power beyond Watts or so are the output filter capacitors.

When they're trimmed to the exact value that we want, they're dipped in acrylic paint to stop them corroding. LB had the smart idea of painting stripes on to them denoting their values in pF! We used to just write on them with a Sharpie, but found that it could get wiped off quite easily. The other problem is power supplies. I've never really been comfortable with running rigs from Switched-Mode Power Supplies.

You need heavy supply cables to prevent volt drop and heating issues I'm really going to have to have another look at the "Advance" and "Meanwell" supplies. These seem to be the best of a bad lot

Design and building of a 300 W MOSFET Push-Pull Power Amplifier for 144 MHz

Aluminum coating tuning knob Ham radio transceiver reseiver.. Step-Start Unit from linear amplifier DN 2. The heat sink and a copper heat spreader not supplied have to be larger than mm x mm and proper fan cooling must be provided too. If you want to get W Pout, you need very low input power, about W Pin. In this order, you need to be very carefully on first power on. To increase the gain at frequencies of MHz is possible by changing the values of capacitors C21, C11, C

NXP BLF8G22LS RF Transistors, SMD, NPN

We use Cookies to give you best experience on our website. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Please see our Privacy Policy for more information. Risk Rank is a proprietary algorithm Supplyframe has developed to quantify component risk rank using multiple data points. This ranking helps engineers and buyers determine whether alternates should be sought for parts that are deemed as high risk. Even the availability of manufacturer specifications and part documentation, such as datasheets and reference designs, have an impact on determining the overall riskiness of a part. The production phase is when the product is being assembled.

RF Power Transistor (BLF177, MRF151G, MRF373)

Forums New posts Search forums. Best Answers. Media New media New comments Search media. Blogs New entries New comments Blog list Search blogs. Groups Search groups.

PM5000 datasheet

Powergain: 22 to 23 dBEfficiency: Forthe frequency range 1. The two balance to unbalance transformers are applied to split the single ended input into 2 out of phase driving portsand to add the 2 out of phase output ports into one single ended output. The transformers have an impedancetransformation ratio of 4 : 1 and match the low-ohmic in- and output impedance of the transistors to the 50 systemimpedance. At the input a special circuit takes care of a good input matching and a flat powergain over the wholebandwidth.

BLF177 PD57006 VERY HIGH POWER ,1x LDMOS BOARD LINEAR AMPLIFIER

Post by Radio Garfield » Wed Feb 01, pm. Post by Maximus » Wed Feb 01, pm. Post by Radio Garfield » Thu Feb 02, am. Post by Analyser » Thu Feb 02, am. Post by Radio Garfield » Thu Feb 02, pm. Post by Tec1

1kW 1.8-30MHz 700W 50MHz HF POWER AMPLIFIER BOARD for LDMOS BLF188XR/XRS BLF188

A wideband linear power amplifier 1. A wideband linear power amplier 1. This report gives a description of a wideband push-pull amplifier for the frequency range 1.

Blf177 Hf Pa

JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Not finding what you are searching for. Try a partial part number. View as: List Grid.

Philips Power Amp Application Note

Customer Service Policy We are more than happy to answer any questions that you have, please contact with us and we will do our best to get back to you as quickly as possible. Scope of business: auto IC, digital to analog circuit, single chip microcomputer, photoelectric coupling, storage, three-terminal voltage regulator, SCR, field effect, schottky, relays, resistors capacitors, , light tube, connectors, and other one-stop supporting services! Orders processed timely after the payment verification. We only ship to confirmed order addresses. The images shown are not the actual item and are for your reference only. Transit times may vary, particularly during the holiday season.

Printable version. View detailed images 1. Click here to be notified of price drops of this item. Notification will be sent to your e-mail address every time the item price is decreased.