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

From - Posted: Feb 17, 2013 - 10,617 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 
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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.
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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
4,718 views | Oct 18, 2014

QRP equipment review Ten Tec R4020 CW transceiver

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Hamfest radio Friedrichshafen 2012 1ere partie BROCANTE

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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 @
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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.
19,803 views | Mar 27, 2011

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

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Building the MFJ Cub Part 1

Construction Series on Building the MFJ Cub QRP CW Radio
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5,398 views | Nov 04, 2012

6 Meter Band Opening and QRP Contacts using a MFJ 9406

This is a video I shot during a little band opening on 6 meters on Wednesday July 8 2009. I was using a MFJ-9406 QRP SSB rig. These radios are simple and easy to use. The audio quality is great and they pack a punch. The antenna used was a 6 Meter horizontal loop at about 40 feet. This video features 2 contacts, 1) W0RIC in Colorado and 2) K4LF in Tennessee. Please visit for more details. I will be featuring a 3 part shoot out between an Yaesu Ft-817ND and ICOM IC-703PLUS in the next few weeks. Please contact me with any requests and keep a look out for more interesting QRP stuff! Thanks for looking. 73 Bob VE3UK
35,877 views | Jul 08, 2009

Inside the MFJ Magloop surprise!

My MFJ-1786 magnetic loop antenna started to not tune up. When this happens the culprit is usually insects in the loop body. In this video we look inside the body and give it a good cleaning. This antenna still impresses me. Check out my other videos of this antenna in use, I have many DX contacts with it.
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Homebrew Buddipole with Modifications

*** DIRECTIONS FOR THE BUDDIPOLE ARE AVAILABLE FROM BUDD, W3FF: ***An overview of a homebrew DIY Buddipole following the basic design of W3FF, Budd Drummond.Among the customizations: - 3-element 6 meter beam - Can be set up as a vertical radiator - Use of Anderson PowerPole connectors for changing coils - 6 to 12 foot mast with simple guying systemDimensions for the 6m beam: http:ww1x.comfiles6m_portable_beam.pdfDirections for the 1:1 balun (via the Wayback Machine):
41,685 views | Feb 17, 2013

Argonaut VI QRP 1 10 Watt Transceiver

12,188 views | Aug 04, 2013

Ass hole on 10m

119,342 views | Aug 02, 2010


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