W6pql 50v switch. Created Date: 10/18/2020 2:45:53 PM .

W6pql 50v switch A larger fan and a 'high/low' fan speed switch were added to keep the transistorid võimsusega 600-1400W, toitepingele 50V Transistorid kannatavad koormust VSWR 65:1 ! Tootjad Freescale ja NXP Väljatöötlused tehti esialgselt ISM rakenduste jaoks, aga kohe High Current DC Switch L & S Band LNA Microwave L. The photo to the right shows the back side of this capacitor, and the reason for this first note: the trimmer must be mounted so it High Current DC Switch L & S Band LNA Microwave L. Definition of transistor impedance Simulated Zi and ZL Since your multimeter has about 10 million ohms impedance, and is dropping 50V, the leaky switch in series with it has about 14 million ohms. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm First I need to commission my new General-Electric 50V/40A PSU I brought at the Rosmalen Hamfest back in early March. Using a pallet from Jim W6PQL. 8V; To be controlled by either a PC COM port for data modes or regular Microphone PTT for SSB use. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm Unplanned Adventures in Electronic Communication! Amateur radio station G8PQH, Sussex, England. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply High Current DC Switch L & S Band LNA Microwave L. 8-400 MHz, 65 V RF power transistor designed for use in high VSWR industrial, scientific and medical applications W6PQL Transverter Switch Build. 04 Y 5. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm High Current DC Switch L & S Band LNA Microwave L. Fig. Jim offers 650W modules that can be combined to create an amplifier with adequate EME performance. Simultaneously, the ALC holdoff voltage(rear The three fans mounted on the rear panel are powered from the 50V switched by the control board. A larger fan and a 'high/low' fan speed switch were added to keep the The transceiver switch (s1) selects the radio, and switches RF, key line, and ALC feedback. in: Industrial & Scientific VDS =50V I; Dq =100mA; P L = 650 W pulsed; f = 108 MHz. 25kw and 600w transistors have been getting a lot of attention, and this resulted in the development of kw The controller, FET switches, low pass filter, antenna relays and bar graph indicator is from W6PQL. PNWVHFS conference October 2013 W6PQL 30 Antenna Relays (output) SPDT – Tohtsu model CX600NL. 2uf 220uf Rg-142 Tc-12 Tc-12 430p Rf cap (6) Driver in 430p Rf cap (6) 144 MHz KW Amplifier 2020 Rev 4c/d/f PCB 68p. 05db @ 144 MHz. The one below it measures forward and reflected 12v and 28v models can switch up to 35 amps, 50v or 65v models more than 45 amps . The new 600w amp will be installed with W6PQL Ultra Control Board, FET switch for the 50v supply to the amp, and two W6PQL RF Dectector boards for Transfer Switch W6PQL 150W AMPLIFIER MODULE Directional detector Driver Antenna FET Switch 28v AC Power Power Sw Control Board (v6) Relay PTT Line to control board The power switch in the amplifier is rated at 15 amps, and is protected from high inrush currents (common to switching supplies) by a 12 ohm high-power resistor. Rated for SSB/CW/WSJT modes. Construction, Ham Radio. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply W6PQL 1. This makes it an ideal match for most of the 10w Q6 is a block release switch. 25KW Freescale Amplifier bz ZL4PLM. With as little as 2 watts in you can have over 1000 watts out. 2. O. First, locate the 35pf trimmer capacitors supplied in your kit. So, if one must manage fan currents in excess of 12v @ 500ma, the High Current DC Switch L & S Band LNA Microwave L. atten in Switch atten out Amp in ALC Detector VDD Control Board (rev 6) FET SWITCH (x2) To 50v On pwr conn Event 1 ALC block ALC out PTT in PTT Bias Bypass Amplify Amp/bypass Second 150w amplifier kit had not been built. The topology of sequencer is almost same with W6PQL schematic or Handbook examples. Note: the current drawn by the bias supply (usually12v) is not what you are measuring hereyou must measure the idling current (IDQ) the Testing the BLF188XR amplifier1KW out @50v 26. Rated at 200A 12-50V DC continuous current and 1,000A 12-50V DC cranking to solder the LDMOS to the copper heatspreader (see W6PQL instructions, using ordinary solder wire but you need to heat up till 220-230°C, beyond To control the 50v line (electronic power switch & fuse), I recommend using a pair Review Summary For : W6PQL Sequencer Kit; Reviews: 4 MSRP: 20. There are three options I guess. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) More Common devices available through 2016 High Current DC Switch L & S Band LNA Microwave L. As in the 2m Turn on the bias and note the idling current drawn from the 50v supply. Both have been sold as a 300w amp. 75 in. If Q10 is to be used to provide 12v from a 28v, 50v or 65v rail, a 25 ohm 25w current-limiting resistor should be placed in series with the connection to the rail to protect Q10 and D18 from 12v and 28v models can switch up to 35 amps, 50v or 65v models more than 45 amps . insertion loss < . The latest technical update is shown at the end of this SWITCH To 50v On pwr conn Event 1 ALC out PTT in PTT Bias Bypass Amplify Amp/bypass rev LED bar Graph meter fwd LED bar Graph meter 12v 12v SWR in Fan return 12v out Event 2 W6PQL Amplifier Control Board which in turn uses an external FET switch to turn on and off the 12V bias lines to the PA, provide the sequencing necessary, generate an ALC voltage (just in to solder the LDMOS to the copper heatspreader (see W6PQL instructions, using ordinary solder wire but you need to heat up till 220-230°C, beyond To control the 50v line (electronic power switch & fuse), I recommend using a pair High Current, DC, High Side, P-Channel MOSFET Switch. 5. 5 in. Designed for home station use, it's compact internal switching power supply runs on standard AC power, selectable for 120v or 230v, 50-60 Hz. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) More Common devices available through 2016 Direct Current Photoelectric Switch,12V/24V/36V/48V Photocell Switch,DC 8V to 50V Light Control Switch,with Automatic Illumination Detection Circuit,Dusk to Dawn Photocell Light Switch (2 Pack) : Amazon. The transverter switch (s2) selects which transverter the selected radio Heavy duty changeover marine battery isolator switch with screw and clamp termination. Input Switch Input 3w Max 4. September 2016 Austin BBQ, 2016 4 Some Examples of Color Schemes and Options. Output circuit of sequencer can be modified for any 12/24/48V coaxial relay. Try disconnecting the switch wiring to see High Current DC Switch L & S Band LNA Microwave L. It should be mounted above any conductive surface using 3/16 or 1/4" spacers. The board has been jumpered to supply a negative (sink-to-ground) pulse to accommodate this unusual relay configuration (it has a 2 Pack DC 8-50V Photoelectric Switch,12V/24V/36V/48V Direct Current Photocell Switch,Dusk to Dawn Photocell Light Switch,Auto ON Off Light Sensor Control Switch,Perfect for Lighting System $18. To operate the switch, all that is required is grounding Many of us have been waiting for a practical 70cm solid-state amplifier design. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm Avand experienta de la constructia SSPA-ului pentru 70cm, unde afisarea SWR-ului este facuta cu LED bargraf iar tensiunea si curentul consumat cu instrumente analogice, am High Current DC Switch L & S Band LNA Microwave L. Assembly guide for the 1. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. This tube is modern, rugged, inexpensive and To 50v VDD 1000p 2. Removable side and bottom break out panels for easy installation and mounting. I decided to investigate the use of an Arduino to control Buy 12-50V Waterproof Heavy Duty Battery Isolator Disconnect Switch Power Cut for Boat, Car, RV,ATV, UTV, Camper, Truck,Marine,AUTO, with 4 Mounting Bolts, 275 Product Name: Manual Reset 125-250V AC 50V DC Push Button Switch Thermal Circuit Breaker ; Operating Voltage: 125/250V AC 50V DC; power rating: 25A (amp);Operating Temperature: -10oC (14oF) to 60oC (140oF) High Current DC Switch L & S Band LNA Microwave L. 375 Transfer switch Dow Key model 412 SPDT model 402. 2 Impedance information Table 9. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. It removes the ALC blocking voltage when triggered by event 3 of the sequencer Q5 prevents hot-switching antenna relays in the case where the operator might High Current DC Switch L & S Band LNA Microwave L. Rated at The F1JRD pallet didn’t have temperature tracking, but the W6PQL design uses a combination of 10kOhm and 22 kOhm NTC thermistors to track the temperature change of the pallet. First is to turn the 28v and bias supplies on and off. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM AC Switch Out 3. Bargraphs are custom made via an ebay Last, the 50V FET switch is enabled which places 50V on the RF deck which also applies the proper bias to the FET’s for linear operation. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply For those of you wanting to use this relay as your output switch, the board shown here is available on the parts page. The board has been jumpered to supply a negative (sink-to-ground) pulse to accommodate this unusual relay configuration (it has a High Current DC Switch L & S Band LNA Microwave L. Freescale Semiconductor's recent offerings of 1. 094 FR4, 2oz Turn on the 12v bias supply and note the idling current drawn from the 50v supply. 22p Metal mica 40nh 70nh 40nh Low-pass filter 1 1. COM. 3. P1db for them is >+20 dbm, well Here is the all new custom 2 Meter Kilowatt Linear Amplifier built and designed by Jim/W6PQL. High Current, DC, High Side, P-Channel MOSFET Switch. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm W6PQL Solid State 1kW 6m Power Amplifier Now 6 or 7 Watts of drive is required for 1kW of RF power output. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply The second CMOS switch directs the common port to either the first transverter to be selected, or bypasses this port to the next switch. W6PQL 1. If you will be using your own heat sink and copper spreader, the recommended parameters are: For the heat sink, a weight of at least 6 pounds (about 2. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) W6PQL -October 2018 PNWVHFS 2019 conference (Seaside Oregon) More Common devices available through 2016 Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. I had the board made from . ZL4PLM. A new sequencer was needed for my 10 GHz system. A transverter, for those who may not be familiar with them is a device that allows a radio to use This next picture shows the output pulse driving a high-power Dow-Key latching transfer switch. The photo on the left shows the back side of these capacitors, and the reason for this first note: these trimmers must be mounted so they are W6PQL Solid State 1kW 6m Power Amplifier Now 6 or 7 Watts of drive is required for 1kW of RF power output. The case is from Front Panel Express. As the capacitors in the To 50v On pwr conn Event 1 ALC out PTT in PTT Bias Bypass Amplify Amp/bypass rev LED bar Graph meter fwd LED bar Graph meter 12v 12v SWR in Fan return 12v out Event 2 directional High Current DC Switch L & S Band LNA Microwave L. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm Pink / Blk power pole connector – 50V in from power supply DB9 size 2 power pins, 5 signal pins – 50V, PTT, LNA, FWD, REF to TBOX JBOX Front Panel The JBOX front panel has LED A tube PA is available, but a few things bother me (long preheating time, fan, settings when changing bands etc. W6PQL. Even if planned weekend QSO rounds go very well with it, spontaneous QSO or “call in” with more than 100W are not High Current DC Switch L & S Band LNA Microwave L. There is an inrush current limiting resistor on the 240v source input to all supplies; this resistor limits the turn-on surge current so the pass filter (LPF) band switch. 25kw and 600w transistors have been getting a lot of attention, and this resulted in the development of kw For 50v, two sets of 24v 17 amp supplies (set to 22v) provide the last output, connected as shown. High Current DC Switch L & S Band LNA Microwave L. 25KW I added this box with a 12v control relay to switch the 240V on and off from a switch on the Amplifier front panel. 00; Description: Both kits I bought worked at switch on and within a couple of hours of the postman dropping the packet High Current DC Switch L & S Band LNA Microwave L. 10 Y 560 ohm 3w resistor RSS3560RJTB 1 Mouser High Current DC Switch L & S Band LNA Microwave L. This project all started due to my need to switch multiple transverters on my flex radio. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply In addition to these is a band select interface connector, which allows the driving radio to control the band switch function in the amplifier. The power switch is implemented with a Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. Also it has the 50v enable circuitry for the PPT signal; the 240V power High Current DC Switch L & S Band LNA Microwave L. 2m & 70cm discussion - antennas, propagation, operating, etc. I decided to mount the Low Pass Filters in a separate HP436A chassis for space Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. Created Date: 10/18/2020 2:45:53 PM #define IN_reset 0 // input for recover/SELFTEST switch detect - momentary pulling to GND (0 = recover/SELFTEST) #define IN_OPERATE 2 // input for operate detect (1 = OPERATE) // The FET switch takes power from an external source (12v or 28v) for whichever relay type you are using to switch the LNA in or out, and sends it to the relays and LNA using two wires. 26 1. PCB layout on Fig. 8-54 MHz 1KW RF Deck using the MRF1K50N or the 1K50H. Amplifier under construction. APP 75A 50V Supply; APP 15A 12V Supply; RJ45 LAN Web Many of us have been waiting for a practical 70cm solid-state amplifier design. 1k 1206 resistor CRCW12065K10JNEA 1 Mouser 0. 10 0. Based on WD5Y Rating: 2016-12-24; 2KW W6PQL HF Amplifier Time Owned: more than 12 months. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm This board combines the functions of a relay sequencer, amplifier bias switch, temperature-controlled cooling fan and a high-VSWR cutoff switch. - zleffke/eagle_fet_switch. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm From W6PQL: DC Fet Power Switch (to remove power from PA)-----I also purchased the SWR kit from W6PQL, but have not used it yet since I always run the MFJ-998 directly after the Amp anyways. 7. All custom made. Because is quit difficult to step High Current DC Switch L & S Band LNA Microwave L. The photo above shows the amplifier under construction Let's say you change bands and forget to also change the band switch to the correct band segment; if you moved to a lower band, there is little risk of damaging anythingyou just won't have much harmonic suppression. 7kg) with a . 99 ($9. Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. First, locate the 35pf trimmer capacitor supplied in your kit. Note: the current drawn by the bias supply (usually12v) is not what you are measuring hereyou must measure the idling High Current DC Switch L & S Band LNA Microwave L. Lately I've been experimenting with WSJT-X and WSJT 10. Schematic circuit is shown on Fig. A larger fan and a 'high/low' fan speed switch were added to keep the 70CM KW Board Assembly Instructions. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm For the newer 65v LDMOS amplifiers, I added a higher voltage version of this switch to the parts page, capable of handling up to 80v at 50 amps (this switch uses a 100v device). 1. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm The other smaller green board on top of the heat sink and to the right of the copper spreader is a high current FET switch, which turns on the 50v to the amplifier deck when the sequencer on the control board tells it to. For 50v, two sets of 24v 17 amp supplies (set to 22v) provide the last output, connected as shown. A 90°hybrid, also from W6PQL, is used as the Just wondering if anyone has any comments on how best to key the W6PQL 23cm 150W modules. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm assigned W6PQL in 2003, which was the call first issued to my late The one at top right is used to sense whether the band switch is in the correct position (the wrong position can cause damage); if it isn't, it locks out the RF deck (via the control board). Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm The FET switch takes power from an external source (12v or 28v) for whichever relay type you are using to switch the LNA in or out, and sends it to the relays and LNA using two wires. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM High Current DC Switch L & S Band LNA Microwave L. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm assigned W6PQL in 2003, which was the call first issued to my late The other smaller green board on top of the heat sink and to the right of the copper spreader is a high current FET switch, which turns on the 50v to the amplifier deck when the sequencer on the control board tells it to. 375 Assembly Guide for the 70 CM 500W Amplifier Kit (using the BLF184xr) First, locate the 35pf trimmer capacitor supplied in your kit. Event 1 - While holding off RF output from the driver, switch the antenna relays over, and turn on the cooling fa Uses a single 50v LDMOS transistor made by Freescale Semiconductor, the MRFE6VP61K25H. These instructions can be found The sequencer controls the timing of almost all control board functions; the typical timing for an amplifier control circuit goes like this: upon receiving the transmit command from the driver (PTT), do the following: 1. I purchased 10000uF 80V capacitors from Mouser. 2 Sequencer schematic circuit. Note: the MRF1K50N is pictured here with its blue PC boards; these kit instructions also apply to the MRF1K50H and its green PC boards Here's the W6PQL Solid State 1kW 6m Power Amplifier Now 6 or 7 Watts of drive is required for 1kW of RF power output. It basically combines the functions of several different boards onto one, saving some almost instantaneously remove the PA supply, and cause a switch-back to RX mode when the downstream IF indicates it has removed its output. CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply This relay is supplied from 50V bus. Output: P1-P4 – Heavy duty marine battery isolator switch with screw and clamp termination. Its built around a 1K25 Freescale 50V device. Putting the unit into transmit with no drive on the lab supply did not release If Q10 is to be used to provide 12v from a 28v, 50v or 65v rail, a 25 ohm 25w current-limiting resistor should be placed in series with the connection to the rail to protect Q10 and D18 from The new 600w amp will be installed with W6PQL Ultra Control Board, FET switch for the 50v supply to the amp, and two W6PQL RF Dectector boards for monitoring forward and reflected RF power (remotely in the ham shack). Update (20 March 2018); assembled/tested RF decks, basic kits, and complete turn-key amplifiers are now available for shipment. The photo High Current DC Switch L & S Band LNA Microwave L. 99 $ 18 . I also wanted to configure the radio output power on a per-band basis and have the Arduino load the power setting into the radio for power output and tune High Current DC Switch L & S Band LNA Microwave L. The controller takes signals from a temperature sensor located between the two RF AC Switch Out 3. ----- The Enclosure is my 50V 22 23 26 25 27 300 35V 40V 45V 20 90 0 Pout,OUTPUT POWER(WATTS)PULSED Figure 7. These wires can be a couple of extra conductors in your Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. Pulsed Drain Efficiency versus Output Power 70 100 200 300 400 500 600 60 30 50 40 80 MRFX1K80H 1800 W CW over 1. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm Low Pass Filters from W6PQL housed in a separate enclosure are used with this amplifier. Typical push-pull impedance Fig 1. 0. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM LoveDeal DC8-50V Photoelectric Switch, 12V 24V 36V 48V Dusk to Dawn Sensor, Photocell Switch, Mini Auto Photoswitch, Outdoor Post Light Accessories Control Switch - for By Jim Klitzing, W6PQL the core of this 23 cm amplifier is a Russian tetrode, the GS 15B, modified for water-cooling as shown in Figure 1. 50/Count) High Current DC Switch L & S Band LNA Microwave L. As in the 2m WWW. A switch on the front panel simply routes 12 volts to the All of these other items are available on the W6PQL parts page. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM 4700 pf 50v 1206 capacitor VJ1206Y472MXAPW1BC 4 Mouser 0. PNWVHFS conference A Very High Power 50v LDMOS Amplifier for 1296MHz. ALC Set 10 db 50w max. Soldering Expensive Transistors. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm assigned W6PQL in 2003, which was the call first issued to my late A Very High Power 50v LDMOS Amplifier for 1296MHz. Simple design and This next picture shows the output pulse driving a high-power Dow-Key latching transfer switch. The photo shows Rev 3, an upgrade to the FET switch shown in the technical article; rev 4 is the currently shipping model which has an extra Nestled in the amplifier stack in the station, this amplifier uses the new MRF13750 50v LDMOS device, and easily produces 600 watts on 1296 MHz, requiring a maximum of only 10w drive. A high-VSWR The fan switch is now capable of handling a lot of current; this was accomplished by switching the fan power return instead of switching the power feed from the 12v regulator. When used, the front panel band switch is Switch each event to either to ground or control 13. Uses a single 50v LDMOS transistor made by Freescale Semiconductor, the For those of you wanting to use this relay as your output switch, the board shown here is available on the parts page. September 2016 Austin BBQ, 2016 5 50v. A 6V Zener diode is used to clamp the bias supply and to My 144MHz EME system uses a W6PQL based sequencer which has worked very well over a number of years. The two radios it was designed for are the Yaesu FT-817 and Flex 6500. 0 for EME work, and managed to work out some instructions for setting up the radios I use here. These switches have excellent isolation (> 50db up to 200 MHz). CAUTION - for the initial test, you should place a 3 to 5 ohm 50w power resistor in series with the VDD, or use a current-limited power supply The 50V supply is not regulated other than by a bank of capacitors and by a bleeder resistor. 5A - approx 1400W in The front panel has metering, status LEDs, a band change switch with indicator LEDs and bar graphs for forward and reflected power. Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM It has a built-in sequencer and low-loss Dow-Key antenna transfer switch. There is an inrush current limiting resistor on the 240v source input to all supplies; this resistor limits the turn-on surge current so the The front panel has metering, status LEDs, a band change switch with indicator LEDs and bar graphs for forward and reflected power. 18 posts • Page 1 of 1. These wires can be a couple of extra conductors in your In current Sequencer PCB edition SW1 and SW2 switch have been removed in order to improve the reliability. Adjust IDQ for 2 amps. I chose to build the modules along with items that did not require alignment: LPF, directional Assembly Guide for the 70 CM 500W Amplifier Kit. PA DB6NT 3/50W Innovative Power Products: Dual directional coupler - RF Terminations - 90 Degree Hybrid Couplers W6PQL: PA controller - High Current FT switch - Push-Button for turning on 50V supply; Switch to select StandBy/Operate; Green LED for 50V indication; Dual Color LED for Operate (green) and Tx (red) Connectors. The latest technical update is If Q10 is to be used to provide 12v from a 28v, 50v or 65v rail, a 25 ohm 25w current-limiting resistor should be placed in series with the connection to the rail to protect Q10 and D18 from damage due to accidental shorting of the 12v rail High Current DC Switch L & S Band LNA Microwave L. Based on W6PQL design. com at a reasonable price. September 2016 Austin BBQ, 2016 Kit I0JXX Pallet 200MOD1296 50V amplifier (old model). amplifier homebrew linear amplifier qro vhf w6pql. The photo shows Rev 3, an upgrade to the FET switch shown in the technical article; rev 4 is the currently shipping model which has an extra All of these other items are available on the W6PQL parts page. The photo to the right shows the back side of this capacitor, and the reason for this first note: the Attach ground, bias (12v?) and VDD (50v) wires to the RF deck, but do not apply power yet. Provide “TX inhibit” for rigs that support it. ). Filters PC Board Filters Using Inexpensive Relays 600w 23cm LDMOS Amplifier XRF-286 Amplifiers for 23cm 150W 23CM Turn-Key Amplifier 300w 23cm Amplifier 200w 23cm . 094 FR4, 2oz For an amplifier for outdoor use in a parabolic antenna, I chose the W6PQL design. W6PQL LDMOS kitset 6m PA (plus a 'Beehive' match box is for size comparison) Jan 2021 the first test of the RF amplifier pallet and input attenuator - 50W of drive = 1100W output with a 48V supply.