W6pql attenuator

The attenuator is an 8db terminated hybrid coupler (the copper PC board at upper left). 3V, 5V, 12V and 42V/27. Each of the low pass filter filter sections are 7-pole Chebyshev types which should give sufficient harmonic rejection. While an amplifier provides gain, an attenuator provides loss, or gain less than 1. (Resimde orta ustte 3 adet transistor benzeri sey. The input attenuator was altered so 35 to 40W of drive produces 1kW RF output with the 48V power supply. The total attenuation for my Forward and Reflected paths is about 6 dB less than the the attenuation for the same paths in W6PQL's design. w6pql low pass filter built with atc rf rated capacitors. The attenuator reduces power to protect the measuring equipment. 500w 70cm Amplifier. By Frank in Linear Amplifier on 20th March 2021 . flow-solder service for LDMOS, if needed. 16"x16"x8". This can be selected by the operator to be either an output voltage on the rear panel or a bias tee feed to a masthead preamp as required. The Gemini 2-500 is a complete turnkey solution incorporating a 50V linear power supply Run a wire from the +v pad on the controller to the 9v feed. The general mechanical layout of the amplifier follows the W6PQL layout fairly closely. This sequencer will handle up to 4 events; one output is able to sink up to 100v at several amps, and the remaining 3 up to 40v Here is the all new custom 2 Meter Kilowatt Linear Amplifier built and designed by Jim/W6PQL. 5 KW Low Pass Filter for 160-6 Meters. board. An attenuator is a two-port electronic device It is designed using resistors to weaken or attenuate a signal. The use of the i/o connector is optional; it was added to the board to facilitate testing with a factory test fixture for the assembled-and The attenuator resistors supplied in the kit are for the standard 1kw forward, 100w reverse full-scale power levels. Jim Klitzing, W6PQL . The energy of a crash is often absorbed by impact attenuators, which are typically comprised of crushable materials. 2 KW Low Pass Filter for 160-6 Meters (rev 6)2-device amplifier pallets are offered by several makers, and gaining popularity as legal-limit amplifiers with ample headroom; this filter configuration accommodates the higher power levels and elevated 2nd harmonic content charac. An attenuator is an electronic device that reduces the power of a signal without appreciably distorting its waveform . The two radios it was designed for are the Yaesu FT-817 and Flex 6500. K. Feb 28, 2021 · The following filters are equipped: 160m band (default) <2MHz. Event 3 - 50 milliseconds after event 2, enable RF output from the driver. In this order, you need to be very carefully on first power on. It is fully remotable including power up, standby mode, and follows radio band selection by bcd method. 2 Attenuators. HL2 with amplifier and LDG AT-200Pro II Tuner transmitting at 14. 2 MHz. Stacking horizontally results in a narrower beamwidth in the horizontal or “E “plane of a horizontally polarisedYagi. 1623. N 37. The input and output of the attenuator are both matched, so there are no reflections. When making transmission measurements using highly sensitive equipment. board spacer set, if ordering the basic kit. RF Attenuators. -----FromW6PQL: Relay boards (for TX/RX switching). Both amps each include a W6PQL Ultra Control Board and FET dc power switch. Log a NEW contact with : World's leading amateur radio web site with news, technical articles, discussions, practice exams and more. 5w max cw. 1. assembled. Generation 2 and rev 6 are basically the same filter, though the T-pad Attenuator. Output voltages (3. The attenuator resistors supplied in the kit are for the standard 1kw forward, 100w reverse full-scale power levels. Mar 20, 2021 · 1kW Linear Amplifier Part 3: Build Up and Testing. 00 Y kit, basic 2m kw amplifier 2MKWAMPKIT 1 W6PQL 471. 8-54 MHz. September 2016 Austin BBQ, 2016 4 Some Examples of Color Schemes and Options. With as little as 2 watts in you can have over 1000 watts out. After considerable experimenting with prototypes, the final results were terrific; with about 40w drive, it can produce 600w (saturated), and covers the entire band (1240 to 1300 MHz). From W6PQL: Input attenuator kit (13 dB pad) to allow 50watts in for full output (instead of 3 watts for full power which is way too risky) The downside of the 13 dB Pad is a lot of heat dumped into the heatsink when running digitial or AM modes. Their uses vary, from a simple gain block used to amplify low-level signals to more useful levels (pre-drivers), to Low Noise Amplifiers (LNA) used in receiving systems for satellite TV, EME, or weak-signal terrestrial work. The main difference is that the recommended heatsink he suggests is a bit expensive when you factor in shipping charges to the UK plus VAT & Customs etc. This detector is connected to the equipment set, consisting of amplifiers, curve shapers, attenuators and filters, and is all under computer control. Feb 13, 2015 · Re: Ham Radio Transverters (28 to 144) « Reply #1 on: February 14, 2015, 09:18:05 am ». If you want to get 1000W Pout, you need very low input power, about 3-5W Pin. 3 is the same as version 6. 5-40w ssb. The amplifier is cooled with a small axial fan inside blowing over the amplifier pallet, and a 100mm square axial fan blowing onto the heatsink fins. 8v preamplifier supply on receive. Mar 20, 2021 · Amplifier Chassis Design. rated 1kw cw and 1. Ammeter 12v regulator FAN 5k thermistor 12v 9. 3 control board. Power handling up to 100W. Three fans are mounted on the rear panel along with RF connectors, power, PTT . Even with this attenuator in place, only 6w drive is really needed. 00 Y Microsoft Word - generation 2 - v2. 2KW W6PQL HF Amplifier. Unsolder the crystal can from the transistor can, and spot-solder the crystal can to the back foil on the controller board as shown. L-pad Attenuator Summary. Time Owned: more than 12 months. 8 to 54 MHz), the result is an amplifier that will just loaf along at 1500w with lots of headroom. The antenna under test is on the test stand in the foreground, with a microwave crystal detector connected to it. QRP operators usually use powers well below this. It has the essential features; a quiet, temperature-controlled cooling fan, sequencer, ALC output to the driving radio, output power meter, and high VSWR fold The Tohtsu relay (with the blue coil) is of moderate cost ($120 or so as of this writing, and useful up through 1. Impact attenuators are devices that lessen the force of collisions between automobiles and roadside obstructions. 1 KW SSPA for 1. An attenuator is effectively the opposite of an amplifier, though the two work by different methods. 00 shipped conus check or cash or paypal. 8 to 54MHz High Power Combiner Set. I also purchased as complete assemblies, the input and output The output of this attenuator feeds the diodes, which sample the forward power level. Over 300 models for virtually any application from DC up to 40 GHz! Fixed, programmable, and voltage variable models. Run a wire from the +v pad on the controller to the 9v feed. Also the top edge of the heatsink are the four 40mm 12 v cooling fans (wired in series and powered directly from the 50 volt supply). 2 Meter 80W All Mode Amplifier. Rated for SSB/CW/WSJT modes. 1 KW 2M LDMOS Amplifier. 2MHz. 99260, CM97an - former call: WB6MYC. Set the attenuation to 40 dB in the second box of the calculator. 5 inches RG402 9 W6PQL 17 Flange-Mount Attenuators •Available in 3,6,10,20 and 30 db packages (availability varies) •Made by ATC and Johanson •100 watt package •Requires A configurable input attenuator capable of matching any driver ranging from 50 milliwatts to 10 watts. 00 471. From the picture the board looks OK but I am not sure about the transmit output stage. Input VSWR is optimized with attenuator on PA input. plug and play. attenuator ALC Detector ALC out To bias port On control board VDD 0 to 30A meter To DC FET switch 1p. When used with two of the 1kw RF decks (1. March 11, 2015 Update With 30w driver amp installed, I have tested up to 130w output. 5kw pep ssb. 00. many modern HF rigs have a minimum power out of around 5 Watts. Un-grounding this port turns the switch back off. Here are all the changes made since the original A 1. ----- 16db 100 watt hybrid attenuators. You can split, you can divide. 00 input attenuator, 6, 10, 13 or 16db INATTEN 1 W6PQL 35. As is now well known, most of the transceivers on the market today have an issue with a strong spike at the beginning of each transmission, causing damage to both solid-state and some tube amplifiers. To produce low power for QRP transmissions. 1MHz. Load resistance for the detectors should be 5k for best linearity. huawei r4850g2 48v 3000w power supply. You only need a bit over 1w in for a KW out on this one; the amplifier shown here has an internal 16db attenuator so it can be used with drivers in the 50 to 100w range. The reverse power port should be sampled 10db higher than the forward to provide a full scale equivalent of 2 to 1 swr, which is the max swr your sspa system should have to tolerate. These are available both as fixed attenuator with a fixed attenuation level and as a continuously changing attenuator. Buy Now. Event 1 - While holding off RF output from the driver, switch the antenna relays over, and turn on the cooling fan (s) Event 2 - 50 milliseconds after event 1, turn on amplifier bias and/or enable main power to the amplifier. Dec 16, 2018 · W6PQL LDMOS HF amp test May 22, 2022 · 5. Reviews: 4. Automatic Transverter Interface. 2 with the exception of adding the 20-pin header connector, and substituting wire holes in place of the solder-to surface mount connection points. 5 KW LPF for 160-6m. This page describes my homemade Solid State Power Amplifier (SSPA) for 144 MHz. 00 54. Even a low power (2w) transverter will still produce 200w output (the amp has 20db gain). 4 watts of drive at the LDMOS device gives 950 watts output. I needed to add an additional Fan just for the Pad. 8-54 MHz Kilowatt RF Deck, kit or assembled/tested (if building from the basic kit, the items in the indented sub-list will also be needed) Machined copper spreader, if ordering the basic kit. Later development was done by several radio amateurs, among them W6PQL James Klitzing. An attenuator may be fixed, continuously variable, or discretely variable. Jun 6, 2024 · The attenuator is a control component, the main function of which is to reduce the strength of the signal passing through it. Figure 3 — Amplifier with front panel tilted down. The driving transverter has decent power (25w), so I use an input attenuator to drop the drive to about 2. 5 KW Low Pass Filter for. • W6PQL –1kw on 160m thru 6m –1. eristic of these different amplifier de. This amplifier combines a pair of 500w RF decks, using input and output couplers; the device used is the 600w Freescale MRFE6VP5600H. Bar graph display support bracket supplied with cabinet fitting 2 W6PQL 0. 6m band <54MHz. And that's all! With the previous inputs, your pi attenuator resistor values should be 51 and 2500 Ω for R 1 and R 2, respectively. Jun 26, 2024 · Ham Member Lookups: 17349. This type of component is generally used to balance signal levels in the signal chain, to extend the dynamic range of a system; provide impedance matching; and implement various calibration techniques in the end . 1 KW 6 Meter LDMOS Amplifier. Description: A sequencer is the key to protecting those expensive microwave or other antenna relays from hot-switching (which destroys the contacts). Saturation seems to be appearing so max output is probably Pacific NorthWest VHF Society The XRF-286 is a wonderful part for use on 1296, and one of the few choices available for developing significant solid-state power on that band. Log a NEW contact with : 11078019 Last modified: 2021-01-17 03:47:01, 830 bytes. hf dual directional detector. Flange-Mount Attenuators •Available in 3,6,10,20 and 30 db packages The transverter can be driven with as little as 10 mw, but it does provide ALC feedback to the driving radio, and has a 14db input attenuator so that it can be used with just about any transceiver. Like the W6PQL design, the PE1RKI (Bert Modderman) amp uses a pair of XRF-286 transistors, but comes fully assembled and tested AND worked out cheaper (Dec 2012) than stuffing around building your own. The children are all grown up now, on their own, and doing O. A 6 dB attenuator in the RF path is made up by the combination of R1 and R2. 5kw+ version –850-1000w/1500w on 6m –Broadband transformer design • Other suppliers (many) • Very complex switching and filtering, as you can imagine –Harmonic content is as high as -11dbcon some bands • Thus, a complex output filter is required – LPF or Combination LPF and diplexer A configurable input attenuator capable of matching any driver ranging from 50 milliwatts to 10 watts. The ALC is used as a safety measure to prevent overdriving and damage to the interface. See listing on my For Sale page. I recommend to start with the article from w8ji about power splitters, baluns, and w6pql. This is to compensate for the roughly 5 dB difference in gain The driving transverter has decent power (25w), so I use an input attenuator to drop the drive to about 2. Position the board spacers in alignment with the mounting holes in the heat sink. Slide the boards under the LDMOS tabs and center them under the tabs. Hobbies other than amateur radio include wine making, precision shooting, golf and tennis. Oct 25, 2018 · Yeni topladigim sette ilave olarak 13dB lik bir attenuator kullandım. 80m band (#5) <4MHz. 00 copper spreader, 3 x 5 x 1/2 CS-machined 1 W6PQL 0. To test the controller, I used the humble setup on the right; radio output is connected to a high-power attenuator/crystal detector into channel 1 of the scope; the time base is triggered by the PTT from the radio. The heat sink and a copper heat spreader (not supplied) have to be larger than 200X140 mm and proper fan cooling must be provided too. This little board is the input attenuator, consisting of a 12 db directional coupler, and an additional 3 db chip resistor pad. The components for the 2 detector areas consist of a chip resistor attenuator to set the correct signal level, a diode detector and an LC filter. 5A (can be set to 45V with trimmer)) N 37. Rated for guitar amps up to 150 watts, this attenuator features five levels of power reduction, a 3-position voicing switch (normal, bright, or warm), and a speaker/load switch for options galore. Apply thermal paste to the back of the copper spreader; then mount the LDMOS/spreader to the heat sink with two 8/32 screws, but leave them loose for now. Current at this port is only 5ma. A 1. This sequencer is even better, and will handle up to 4 events; one output is able to sink up to 100v at several amps, and the remaining 3 up to 40v at about 500 ma each. Email: Login required to view. Upon switching back to receive, these events ÐÏ à¡± á> þÿ S U WWW. SourceRage of Elements pg. Transverter Selector. The Event 1 - While holding off RF output from the driver, switch the antenna relays over, and turn on the cooling fan (s) Event 2 - 50 milliseconds after event 1, turn on amplifier bias and/or enable main power to the amplifier. The directional pickup traces can separate the forward and reflected signals by more than 30db (directivity is the commercial term for this specification). 8 to 54 MHz combiner set. Whether it is an MMIC, E-PHEMET or GaasFET, they are all similar in form, usually in a small surface-mount package. $499. Using our simple table of “K factors”, we can see that the “K” factor value for calculating attenuation loss of -10dB is given as 3. Oct 9, 2020 · POWERHOUSE. 10W-15W output from a single device normally means that they are operating the stage in Class C which means FM and CW mode only, but they do say that the unit is "all mode". 20m and 17m bands <18. Using a trilithics notched attenuator I am getting about 10dB's of Sun noise but haven't had the opportunity to check the level with the new LNA. A trimmer resistor across the output provides some adjustment of the output level, as well as a load to make the response of the diodes reasonably linear (more on 2016-12-24. Calculate the values of the three resistors required. W6PQL 150W AMPLIFIER MODULE Directional detector Driver Antenna FET Switch 28v AC Power Power Sw Control Board (v6) Relay PTT Line to control board Sequencer Event 1 28V Power Supply To control Board Sequencer Event 2 PTT PTT Sw (amplify/bypass) ptt Xmit LED PWR LED Lockout LED D. Additionnaly, the Drain of Q3 is connected to the base of the transistor Q1 (MMBT2222) on the W6PQL “Ultimate Amplifier Control Board (V6)”, making this last to trip as well. 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). W6PQL 17 Flange-Mount Attenuators •Available in 3,6,10,20 and 30 db packages (availability varies) •Made by ATC and Johanson •100 watt package •Requires W6PQL. W6PQL 17 Flange-Mount Attenuators •Available in 3,6,10,20 and 30 db packages (availability varies) •Made by ATC and Johanson •100 watt package •Requires transistion boards Here is the all new custom 2 Meter Kilowatt Linear Amplifier built and designed by Jim/W6PQL. Here's a small collection of general purpose relays; they are not coaxial, and they were not designed to be used to switch RF power, but they will. Attenuator Circuits The pi circuit There are five common attenuator topologies used in microwave circuits, the tee, the pi, the bridged tee, the reflection attenuator and the balanced attenuator. Ham Member Lookups: 39567. The LED “Overdrive” indicates this state on the front panel of the amplifier. 220vac 15a. 00 35. I chose to build the modules along with items that did not require alignment: LPF, directional couplers, etc. To operate the switch, all that is required is grounding the 'on' port. 3K-FA and 1. Here are the main boards mounted on the heatsink. COM. A T-pad attenuator is an attenuator network consisting of three non-inductive resistive elements connected together to form a “T” configuration, (hence its name). RFHAM is currently offering board kits for these 500w amplifier units, which contain the more difficult-to-get parts Station. Attenuators are passive circuits, they work without any power supply. e. Generation 2 and rev 6 are basically the same filter, though the Attenuator. However most people stack to get more Assembly guide for the HF dual directional detector. A copy of the data sheet can be found on the internet in Power splitter combines or divides power. It works in bi-directional way. A Pi-pad attenuator circuit is required to reduce the level of an audio signal by 10dB while matching the impedance of a 75Ω network. ALC from the controller board is connected to the radio. Dec 3, 2019 · 1. It was made primarily for EME work. Decreasing this to 650 ohms will range the coupler and detectors for 2kw. The tee, pi and bridged tee each require two different resistor values, while the reflection and balanced attenuators need only a matched pair of resistors. None cost more than about $5. MSRP: 20. Click any thumbnail for an enlarged picture. In the Z0 box, type a value of 50 Ω. 5. W6PQL. The 144MHz Gemini 2-500 incorporates the same, sequenced, front panel switchable 13. Although not as common, this “T” (tee) configuration can also be thought of as a wye “Y” attenuator configuration as well. The construction is based on DUBUS 4/2010 where Lionel Mongin (F1JRD) describes the concept. The most current version of the filter is generation 2; the original filter article, and another revision ( rev 6) of the original filter board are also described here later for reference only. RF-sensing t/r switch for remote operation, as well as a hard-key option. This amp has two blf188xr modules so it will loaf at legal limit. However, if you have one of the QRP 5w or 10w radios, this attenuator can be bypassed via rear-panel jumpers. C1 100p D1 D1 hsms281c C2 1000p C3 10n Vr1 5k To fwd Feb 10, 2021 · Step 5 - Initial testing with an ohm meter showed a short on the VDD line, W6PQL sent a new pallet immediately, and once installed everything worked as expected i. It requires 8W of drive for 150W out. The activation casts a 5th-rank spell, with a spell attack modifier of +18 and a spell DC of 28: airpressure zone, earthsand form, fireflames of ego, metalimpaling spike, waterfreezing rain, or woodentwined roots. v6. Review Summary For : W6PQL Sequencer Kit. First licensed in 1964; assigned W6PQL in 2003, which was the call first issued to my late father in 1938. LDMOS transistor, if ordering the basic kit. The amplifier was to be used with a 10w radio, and without the input attenuator, would only require 250mw for full output. Typically, one would have the high-capacity port switching the antenna relays, and the others handling amplifier, transverter, or radio switching. The Kenwood TS-790A that Im using on 2m generates up to 30W needs to get cut back by about 10 dB for the right drive. price:$2800. Low-loss antenna relay. Nov 7, 2023 · Secondly, is there a working example of a push-pull transistor amplifier? There are various HF and VHF/UHF amplifier designs such as W6PQL's 2m amplifiers etc, and various HF amplifiers based on dual device LDMOS packages, but I have not a clue how to simulate a push-pull amplifier nor the matching transformers, especially the coaxial baluns any pointers or working examples would be useful. 8 to 54 MHz Dual Directional Detector. Own echoes typically –24 area (350 watts at the power splitter feedpoint) and significantly better during the recent December Supermoon. The transceiver switch (s1) selects the radio, and switches RF, key line, and ALC feedback. This switch box was built to allow the use of 2 different radios to be used with 3 different transverters. The next set of three photos (below) shows the test results on an IC-7000. Gate Attenuator (Greater) Item 11. Oct 8, 2021 · 10/06/21 #12604. Resistor values (and their part numbers) for other power levels are listed at the end of the technical article, and can be purchased from any of the major distributors. In this tutorial we have seen that a L-pad attenuator circuit is a passive and purely resistive network which can be used to reduce the strength of a signal while matching the impedances of the source and load. Detail. ) Bu sayede cihazi tam guc (50W) actigimda bile lineer'de bir sorun olusmuyor ve 50W ta yaklasik 1200W guc elde edilecegini soyluyor W6PQL In the 1/2012 issue of Dubus magazine, F5FLN showcased his KW amplifier for the 70cm band. You can use it for combining antenna signals, or use it as a two-port output device. This feeds the input coupler mounted on the vertical bracket to it's right. 55915, W 121. Excellent accuracy, repeatability, and flatness versus frequency. 224Price 1,400 gp The item bonus to your impulse attack modifier is +2. Here is a message from SPR website: Launch of the “Third series of SPE EXPERT 1. Solder one end of the sensor into this joint, and run a wire from the other end to the sensor pad on the controller board. Output Power is at the limit of LDG (240W @ 45V/7A) Power Supply is Cisco Catalyst 6000 6500 Sony APS-162 (ID) 1300W PSU P/N 34-0918-02 8-681-326-21. Version 6. 160-6 Meters. I purchased most [1] of the boards in kit form, rather than pre-Figure 2 — Amplifier rear panel. SMA RF connectors are used to bring out connections to a 13dB 100W attenuator that can be placed in circuit when 100W transceivers are used to drive the amplifier, or bypassed when 5W radios are used to drive the amplifier. 00 Y Kit, bar graph display, red, green, or tri-color BARGRAPH 2 W6PQL 27. Assembly guide for the HF dual directional detector. 40m and 30m <10. Unlike the previous L-pad 3 days ago · Login is required for additional detail. 15m, 12m and 10m bands < 30MHz. Test it at low power, than at full power. Upon switching back to receive, these events Apr 23, 2024 · Select "Equal impedances" in the "Circuit type" box. 500w on 6m. 5K-FA amplifiers”. An attenuator is a two-port network used to reduce the amplitude of a signal and it does this by absorbing power and without distorting the signal. Oct 8, 2023 · An impact attenuator is a piece of equipment that is installed on an attenuator truck. click a picture to enlarge. After making various adjustments to the original LPF filter configuration and noting some of the changes which could be made to the board to make it easier to construct, tune, and re-configure (if necessary), I decided to modify the board layout itself. The second amp is a kit which can be purchase as-is or I can assemble it (30-day delivery). 1 KW 222 MHz LDMOS Amplifier. 3GHz. I ordered the SSPA, LPF, control board, and two of the dual direction detectors (SWR boards) as kits. 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. MESA/BOOGIE. made in the usa. an output low-pass filter to comply with FCC regulations for harmonic and spurious suppression. At the front end is a chip resistor attenuator (R1,R2 and R3) to help put the detected RF at the most useful level for the diodes; then follow the whole thing with a low-pass filter. For those who want to be able to combine amplifiers to get to the legal limit, the coupler set shown here will get you there easily. 6-160m. Logbook. This makes it an ideal match for most of the 10w radios in use today. 16db attenuator on the input. Resistor values (and their part numbers) for other power levels are listed at the end of the technical article, and can be purchased from any of A signal source is connected to this antenna, and is square-wave modulated at 1KHz. C. It is an unmatched 26v LDMOS transistor that was once made by Motorola, and can still be found in surplus PCS amplifiers made by Spectrian. Internal fans, swr protection, alc circuit and LNA switching. 5w before the input splitter. docx. In some applications, such as interference from or to points off to one side or below the main lobe, the reduction in beam width is a more important consideration than the gain increase. I'm using a 6db attenuator pad on the input so it's actually 15 watts of drive from the rig. . 1 He described a Class AB amplifier that used a Freescale MRFE6VP61K25HR6 power FET with characteristics I was looking for – and with gain to spare. Biography. The top left is the 15 dB input attenuator, below it is the control board and to its left is the FET high current switch. High power amplifier for 1296. Uses a single 50v LDMOS transistor made by Freescale Semiconductor, the MRFE6VP61K25H. There are differences between W6PQL's design and my design with respect to transformer coupling factor values and pi attenuator values. L-pad attenuators are commonly used in audio electronics to reduce the audio signal produced by an amplifier Feb 19, 2014 · After discounting a W6PQL based kit, a PE1RKI 23cm 150W Power Amplifier was decided upon. mg ft jm pu xh od fi nr sm gq