Cooking | 80 MFJ Cub 40m QRP CW Transceiver circuit walk thr

Cooking (0.06 seconds)

Get email alerts with latest cooking tips via email
(You can cancel email alerts at anytime.)

80 MFJ Cub 40m QRP CW Transceiver circuit walk thru and review, plus bandsweep, ham radio MFJ 9340

From - Posted: Feb 17, 2013 - 10,931 views
Cooking | 80 MFJ Cub 40m QRP CW Transceiver circuit walk thru and review, plus bandsweep, ham radio MFJ 9340 | 80 MFJ Cub 40m QRP CW Transceiver circuit walk thru and review, plus bandsweep, ham radio MFJ 9340
80 MFJ Cub 40m QRP CW Transceiver circuit walk thru and review, plus bandsweep, ham radio MFJ 9340
80 MFJ Cub 40m QRP CW Transceiver circuit walk thru and review, plus bandsweep, ham radio MFJ 9340
Duration: 16 minute 36 seconds 
Play Cooking Video
I assembled this MFJ-9340 Cub QRP CW transceiver for 40m for my friend Gerry - N2GJ. It's a very pleasant kit to build. All surface mount components are already mounted on the board. Assembly involves soldering the through hole components, and winding two toroidal coils. For me, the assembly took one evening, and the alignment took another evening. The video goes through the block diagram of the transceiver, then walks through the schematic, describing the function of each circuit. The transceiver tunes from about 7005kHz to about 7.070kHz. At the end of the video, I sweep through the band, listening to the various CW signals that can be heard on the 18" antenna I have connected in the basement. Pretty sensitive for a simple receiver.
speed up the downloads
Like to get lastest cooking tips everyday!

Hamfest radio Friedrichshafen 2012 1ere partie BROCANTE

Ici vidéo de la brocante du ham radio 2012 de Friedrichshafen. Une fois encore un beau salon, bien fourni en brocante ou matériel neuf. Ici c'est la vidéo de la BROCANTE, la vidéo matériel neuf est dans la 2eme vidéo.
14,231 views | Jun 29, 2012

Elecraft K1 CW QRP 4 Band Transceiver

This is just a short clip of my new Elecraft K1 Qrp Transceiver, Having just built and assembled it this week January 2012 Ser. No. 3114 is born!Enjoyed building the new radio, Excellent Kit as always from Elecraft with a very good assembly manualThe Transceiver has the 4 band filter module fitted, 40, 30, 20 & 15 meter bands Pwr is 5 watts down to 100 mw Already made a few contacts thousands of miles away! Looking forward to trying it out portable !
6,591 views | Jan 26, 2012

MFJ CUB 40m QRP Kit ARRL Package

Here on YouTube.comNG9D we spend a lot of time fiddling around with low power (QRP) radio transmitters, simple receivers, home-made wire antennas and various little gadget kits, celebrating perhaps the best hobby in the world - Ham Radio! In this video we look at a 40 meter QRP transceiver, kit. ARRL sells this radio kit together with an informative book on Low Power Communications. All the Surface Mount Devices (SMD) are factory installed, which makes it very compact and easy to assemble. To align the kit, there are several ways to do it but the only sophisticated piece of test gear needed is a ham transceiver with accurate frequency display! The only other gear you will need is a dummy load (can make from two 100 ohm 1W resistors), a QRP power meter (can make from a 5mm LED), a telegraph key, a 12 volt power supply, and earphones. ... Alignment is simple - it is all done by adjusting the trimcaps and slug tuned coils with a plastic screwdriver. This might sound complicated, but it is really not at all. The manual gives VERY good instructions. I will give you the complete method I used:1. BFO Frequency Spot it by listening to your receiver and Adjust: Trimcap C27 product detector operating frequency to 11.996 MHz. 2. VFO Calibrate: Slug-tuned coil L3 sets the VFO tuning range. Adjust by listening for Cub's VFO signal on receiver. Set for 4.940 to 5.000 MHz. 3. Receiver Bandpass Filter: L1 and L2 peak the receiver's front-end for best weak-signal sensitivity. I did not use a signal generator, I adjusted for maximum noise. Easy. 4. BFO C27 is touched-up for correct sideband LSB, I used signal from my ham transceiver into a dummy load. 5. VFO touch-up, L3 adjusted with Cub into dummy load, and frequency set within ham band. 6. Transmit Carrier Offset: Trimcap C40 sets CW-offset frequency for the desired pitch (say 600 Hz or so). 7. Transmitter Bandpass: L6 and L7 select the desired mixer product and peak the transmitter for maximum RF-output. I used a QRP power meter kit from Ten Tec, but you can also adjust for maximum brilliance of the LED homebrew power meter (LED connected across dummy load terminals). 8. Power Output: Trimpot R19 (mixer drive) sets RF-level from zero to full output Adjust up to the point of max power, but no further (to keep signal clean).Use plastic tool! Metal detunes circuit. I had a plastic tool from a Ramsey kit. You may have one already, if not buy or make one. They are inexpensive and save a lot of grief.This is a good kit for QRP builders, and works very well. By the way, I counted ten of the thru hole caps as type NP0. Temperature compensation of VFO in the completed unit seemed very good. The other video (wire loop with Cub) was made from cold start. I found that the rig exhibits very good stability on 40m.The kit is well manufactured and the instructions are clear. Assembled and tested Saturday, 18 Oct 2014 1445 hrs local with coax fed one wavelength doublet antenna 25 ft high. The book that comes in the ARRL package, "Low Power Communication - The Art and Science of QRP", 4th ed. 2012, included in ARRL kit package is written by Rich Arland, K7SZ. It contains a huge amount of entertaining and useful info. Appendix C contains the complete MFJ step-by-step assembly and alignment procedure for the CUB transceiver. Rich writes well and discusses equipment, antennas, operating, propagation, accessories, modes, etc. ... He covers many popular QRP rigs, but I was a bit surprised he didn't mention a couple of my favorites, the Ten Tec T13xx series and the Hendricks PFR-3A -- or any Hendricks kits for that matter. But this is explained also, there is only so much room in a 299 page book! There are even a few small antenna projects outlined. It's a fun read for QRPer,So, for about $110 including shipping, this is a very fun and educational ham radio project!73, Lynn - NG9D
5,600 views | Oct 18, 2014

MFJ 9420 20 Meter SSB QRP Transceiver Introduction and overview AF5DN

Quick introduction to the MFJ-9420 20 Meter SS QRP Transceiver.Please visit my Amazon A store for some great Radio Products. Please visit my web page @
21,490 views | Sep 09, 2012

SGC 2020 hf transceiver QRP radio collectable Floyd Virginia LCF Group

The SGC 2020 hf transceiver Reprint from SGC company Information: The SG-2020 covers all HF frequencies from 1.8 to 30 Mhz. It is factory-set for 20 watts PEP with front panel power adjustments down to 1W using USB or LSB. There are 20 factory pre-programmed memories preset to frequencies within each of the nine amateur bands for fast band accessibility. Each memory position can be selected for a specific transmitter output power, specific amount of bandwidth filtering, mode and split VFO. The memory channels can be re-programmed to accommodate alternate frequencies of your choice within the frequency range and a simple unlock procedure allows you to choose any HF frequency worldwide.All Reasons. All Seasons. This is the transceiver for base, backpack or business trips - the ultimate portable trasceiver. There are no confusing menus and just two-step operation: select your frequency and transmit. The SG-2020 is compact and weighs only 4.5 pounds. Operate SSB or CW from wherever you are. The radio comes standard with SGCs superior ADSP² noise canceling technology, so you can copy signals loud and clear. The SG-2020 ADSP² is pure, simple HF at its best. The above reprinted from the SGC company information. This video was produced by the LCF Group, ( We are on The Crooked Road Heritage Music Trail and the Round The Mountain Artisan and Craftsman Venue as a great place to visit ) Floyd Professional Center, Village Green, Floyd Virginia. The LCF Group consist of David Larsen KK4WW, Gaynell Larsen KK4WWW and Dee Wallace KG4VMI. We are all radio amateurs and also are Directors of The Foundation for Amateur International Radio Service ( FAIRS) also located in Floyd Virginai. N4USA is the radio call for FAIRS and we have operated in Dominica as J79WW J79WWW J79VMI and many other countries. We are members of The Floyd Amateur Radio Society FARS. The LCF Group (1-540-745-2322) ham radio morse code cw amateurradio hamradio transceiver radio receiver linear amplifier linear amp heathkit ten-tec cw http:www.virginiamountainland.Com and http:www.microcomputerhistorymuseum... and in Floyd Virginia. compass magazine blue ridge Parkway Destination Center ,David Larsen Blacksburg, David Larsen Blacksburg Group, Blacksburg Group, , , , Bugbook , , , , , , , bugbook series Bill St Pierre Floyd Virginia video
37,022 views | May 04, 2009

158 Directional Coupler Basics how to sweep SWR of an antenna Return L...

This video describes the basic properties and specifications for directional couplers, and shows their basic operation on an oscilloscope. Typical applications are discussed, along with a practical example showing how to sweep the VSWR, or Return Loss, of an antenna using a directional coupler and a spectrum analyzer with a tracking generator. The resulting return loss measurement is compared to the SWR measured on an MFJ-259B antenna analyzer.Datasheet for the directional coupler used in this video: http:www.minicircuits.compdfsZFDC-20-5+.pdfMy video on the basics of Tracking Generators:
14,072 views | Jul 05, 2014

QRP equipment review Ten Tec R4020 CW transceiver

A look at the Ten Tec R4020 QRP transceiver. Designed and made in China, I understand this 40 & 20m transceiver was modified to meet FCC specifications. Things not commented on: 1. Instruction manual isn't the best but the rig is easy enough to use. 2. Reports of the transmitted signal were very good, with no clicks or chirps. 3. Receive current consumption about 55mA, or about 16 that of the FT-817. It filled my need for a not too expensive portable QRP rig for these two popular bands. There's a few minor things that could have been done better, but overall I highly recommend it. As the log extract shows, it is capable of many DX contacts, even with simple antennas, when tested by the beach.
13,974 views | Mar 05, 2012

Building the MFJ Cub Part 1

Construction Series on Building the MFJ Cub QRP CW Radio
2,345 views | Nov 22, 2013

Homemade HAM Radio CW SSB receiver for 20m

My homebrew CWSSB receiver for 20m band based on NE612 chip.The crystals in the ladder filter are not perfectly matched. The tuning potentiometer is recycled and has mechanical flaws so I shoud hold it with my thumb while tuning. :-)Update2:For all, who would like to receive the schematics and PCB, please send me a PM with your e-mail address.Update:Because there are lot of requests, there is the schematics of this receiver: https:twitter.comBalageJstatus216531997563174913photo1
43,446 views | Dec 31, 2010

The Ugly Weekender A Homebrew QRP Transceiver

This video shows my version of a QRP amateur radio transmitter called the "Ugly Weekender" designed by Roger and Wes Hayward and described in the August 1981 and June 1992 issues of QST magazine.Note: Wes Hayward (one of the designers the Ugly Weekender) pointed out a potential issue with the way I built my rig, having all of the boards in the same box. I wanted to pass along what he said:"There was a reason for placing the VFO in one box and the PA in another with the original UW transmitter. Oscillators, especially free running LC circuits, are very susceptible to stray RF that might be applied to the circuit. But the susceptibility is only extreme if the stray RF that hits the VFO tank is at, or close to the frequency of the VFO. Stray RF get into the tank by RF conduction through amplifiers and power supplies or by radiation. Buffer amplifiers take care of the conduction problem while decoupling (more than just bypassing) takes care of the power supply coupling issue. The radiation coupling is best handled with shielding. In the original UW, there was a 50 Hz shift in the oscillator when the key was pressed when the shields were in place. The shift became a couple of kHz when the lids were removed from VFO and PA.There is another way to fix the problem that is even more effective and that is to operate the VFO at a frequency that is far removed from the PA. An especially good design is to operate the VFO at half the output frequency, or the 80 meter band. Then the VFO is frequency doubled before it is amplified and applied to the antenna. My versions of the UW all use frequency doubling. The circuitry is shown in Chapter 4 of Experimental Methods in RF Design. See page 4.27."So be aware of this if you plan to build this rig, or one like it. I will be looking a adding some shielding to the boards in my version. It is built on three separate PCBs so I think that is feasible.
20,490 views | Mar 27, 2011

Android AM CW SSB Receiver in your Hand

Was sent the link from the USA and downloaded it onto the Galaxy S4 and away she went straight away. The application allows some control over Yaesu FT8*7 radios via HRD and sound via Skype being an option when connected it seems. I am not the technical guru of this so check out the website of the man above with .ro at the end and check the application in the Play store. I need to read all the bumph now and see what else this can do. I think on the first looking its an excellent tool for the radio person.
24,688 views | May 30, 2013

HK1NA CQ WW CW 2012 HK1R Jumanji Field Contest Station

Many thanks for all Amateur Radio Stations works and give us the point, multilplier and zone. We make our best effort to make a nice contest presentation this year 2012. Conditions on 10,15 and 20 no better than the other contests, but try to ear everybody, Many thanks to Jorge Prieto HK1R to accept us in his station and project. This is a little video from my Iphone 4s cam. You can visit HK1R Jumanji Fiel Radio Station in web page http:hk1rjumanji.dxarc.orgThis is our score on CQ WW CW 2012 ContestCall: HK1NA Operator(s): HK1NA Station: HK1RClass: MM HP QTH: TUBARA Operating Time (hrs): 48Summary:Band QSOs Zones Countries -------------------------------160: 904 20 6680: 1717 27 9340: 3292 33 12820: 3521 39 15915: 3366 37 14510: 3155 38 139 ------------------------------- Total: 15973 194 725 Total Score = 43,442,049Club: DXARC COLOMBIAAmigos and compadrs hope ear in another contest.73sPedro HK1X Colombia
6,812 views | Nov 27, 2012

Three features every homebrew QRP CW rig must have

How do you know if that simple QRP design is going to get you contacts or not? Have a look at its features. If it's very low power, stuck on one frequency and doesn't have efficient transmitreceive changeover it won't do much for you. In this video I explain why these features are all important and present a simple mod that will make almost any VXO rig into a more versatile split frequency transceiver. A circuit and constructional article on the 'Split 40' transceiver appeared in March 2013 Amateur Radio magazine. Note that the capacitors in the pi network are 390pF and not 220pF indicated.
12,479 views | Jan 27, 2012

Ham College Episode 1

A new show for those new to the hobby and those wanting to become Amateur Radio Operators. Early Radio history. What is an Elmer? Build a Spark Gap Transmitter. Additional Technician exam questions and answers. And more… Your excuses for not becoming a Ham just expired. 1:15:46
5,400 views | Jan 31, 2015


Assembly of Ramsey's QAMP Linear RF power amplifier kit. The QAMP is a compact 10 to 20W amp designed to be driven by 12 to 2 Watt transmitters. T-R relay automatically switches the power amplifier into the circuit and amplifies RF power. When amp is off, it is bypassed and QRP transmitter is fed directly to antenna. At 13.8 VDC with ≈1W input it produces ≈10W output. Surface temperature of the FETs and their heat sinks in the push-pull amp: Q1 got a bit warmer than Q2, and maximum temperature was ≈170°F (77°C) in open-air after about an hour of testing at an ambient temperature of ≈79°F (26°C). STP16NF06 N-Channel power MOSFET in TO-220 case has a maximum operating junction temperature of 350°F (175°C). Comments on kit: I read all the many useful hints and suggestions for this kit on-line. When the kit arrived, I was impressed with the quality of the components and completeness of the manual. This amp is designed to work with an input power level from about one to two Watts. So it seemed that no mods were needed for my application, and I decided to build it according to the manufacturer's instructions. I would only modify or fix if needed ... The only small difference to the manufacturer's instructions: since no #24 gage enamel wire was included in my kit (it had been opened) I used #26 enamel wire for the secondary transformer, and #22 enamel wire for the primary transformer and the toroids. By the way, if you go to Radio Shack to get enamel wire, DO NOT use the RS part number listed in the Ramsey instruction book 278-1341, since that RS part number is for "tinned-copper bus wire" which is UNINSULATED and will not work for winding transformers or toroids. If no enamel wire is included in your kit, I suggest using what I used shown in this video. The RS part number of the enamel wire I used is 278-1345. Now my little QRP rig, based on Doug DeMaw's tuna-tin circuit, is putting out 10W! I suppose time will tell how this amp holds up. Update 20Jan13: Early on-the-air testing is promising, RST reports received so far are 539 to 559. I was so impressed with the iambic paddle I bought from Joe, K8LKC, I commisioned a straight key. It is equally well made! Joe is a real craftsman. 73, Lynn NG9D
1,927 views | Jan 18, 2014

QRP CW morse code

Qso local en CW con EA5HEH Toni de Molina de Segura Youkits Mark II qrp 5w antena MFJ 1640 autotuner Z817QRS nuevo operador, sorry hi hi......
8,003 views | Dec 31, 2013


        Disclaimer: Cooking-Library.Com is a Food and Cooking search engine that indexing and organizing articles on the web. Everyday 100+ new guides, tips, experiences to improve your cooking skills.

        © 2015 - Cooking-Library.Com