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Mustool MT883 Soldering Iron Review (kinda long)
This is a 117V, A.C. line powered, temperature-regulated soldering iron available from Banggood and other vendors. Positives: IMO, this is a fine tool for the price (~$9 - $20 dollars, vendor dependent). The overall appearance and construction quality is very good. I like the light weight of the iron and the flexibility of the power cord. I also like the user interface (LCD display and controls). This is an iron I can put in my field toolbox and not need to carry around a soldering station. I also like the fact that it uses readily available Hakko (or equivalent) soldering tips. Negatives: I gave it 1 star for quality on Banggood because, unfortunately, mine will not function properly as received. It heats and regulates the tip temperature however the display cannot be calibrated for the correct readout as the required offset is out of range of the iron's control system. This is NOT a design flaw as I've used Doug KI6DS's MT883 (also purchased from Banggood 7 days after mine) , calibrated it with ease (I own a soldering tip thermometer) and successfully soldered with it. We used both irons at this past Friday's QRPacificon Buildathon during construction of participant's Pacificon Special Antenna. I simply used a "fudge factor" to set mine to the correct tip temperature. After which it functioned acceptably; only the temp. display was incorrect. Instructions: Seem to be unavailable in electronic format on the 'net. If one is sight-impaired, prepare to use magnification to read the the white-on-black instructions printed qrp type size on the back of the package. I got through it, with some difficulty. Considering the low price I paid for this tool, returning it is not worth the trouble of complying with Banggood's ridiculous return policy requirements. I can recommend this iron, especially for novice electronic hobbyists, PROVIDED that one is willing to accept the possibility of receiving a defective product. As Wayne Green used to say, "Caveat Emptor". 73.......Steve Smith WB6TNL "Snort Rosin"
Started by sigcom1 @
F.S. Mini Paddles by n0sa
I have built another batch of my mini paddles designed for portable work. They are great for SOTA ops, small, lightweight and all aluminum and stainless steel. If you think you may be interested contact me OFF LIST at; n0sa@... I will send all the info on request. 73 Larry n0sa
Started by Larry Naumann @
OT: Yahoo Groups is going away 7
Yahoo Groups is going away. If you need any files, photo's or other data from any group you are member of, get it now, by the end of December it will all be gone. -- Terry VK5tm www.vk5tm.com ( https://www.vk5tm.com )
Started by Terry VK5TM @ · Most recent @
PCB material fabricated NanoVNA chassis 3
Hi all, I have designed and built a pcb fabricated case for the the NanoVNA. It's on the qrpguys.com site under "misc" files. or at <https://qrpguys.com/wp-content/uploads/2019/10/nanovna_chassis_fab_101419.pdf> until the name changes...:) ken
Started by Ken wa4mnt @ · Most recent @
mISSSING mEMBER lIST 3
dID WE NOT HAVE A MEMBER LOOKUP ON THE HOME PAGE? yES, i FORGOT MY NUMBER. Did we take that function off the web? Mike Baker K7DD
Started by Michael Baker @ · Most recent @
TenTec Argonaut 509 3
Could some kind fellow-owner please check the value of R5 on the RF Power Amp Board (80185) in a TenTec 509? The CIRCUIT indicates TEN Ohms but mine is color-coded & measures ONE Ohm. No need to dismantle anything: It can be measured (near enough) across the ANT SKT & via the Low Pass Filter/SWR Bridge Board (80260), unless you have fitted a series capacitor to isolate the DC path presented by a Mag Loop Ant. BTW, having said that, I ran the rig into a Mag Loop for about twenty years before I discovered it was looking into a DC near short-circuit! And while I'm here, does your 'S' meter bang hard over when the key is pressed? 73, Alan Williams G3KSU
Started by Alan Williams @ · Most recent @
Idle current, QRPGuys DSB Digital Transceiver 7
Chuck, After setting the Gate bias voltage according to the instructions, what is the resultant idle current on your DSB rig (jumpers set for bias setup)? (I know it will vary somewhat from rig to rig) 73.......Steve Smith WB6TNL "Snort Rosin"
Started by sigcom1 @ · Most recent @
Watcha Doin'?
-- William, K6WHP "Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"
Started by k6whp @
DSB transceiver heat sink 9
The QRPGuys new DSB transceiver requires the 3xBS170 FETs to have some heat sinking. Attached is photo of my solution. I used some 7mm wide heat sink tape that I bought off of ebay for cheap that came in a 10m or larger length roll. I use it for heat sinks that come without the tape for CPUs. Allows heat sinking and allows replacement if ever needed. I find it much easier than using wire and/or aluminum strips with screws for hold downs. I,too, dislike with a passion the use of 3xBS170 FETs for finals. The first time you transmit without an antenna connected, have a high SWR or have a short at the BNC or later, you will blow the finals. I know that Steve Weber loves to use these puppies because they are so cheap, but it is such a hassle to replace them. The DSB xcvr as it is now has no zener protection, but you could easily solder a zener in place beneath the board. Ken shows 4W out on 40m. That means a peak voltage of 20V. So I'd recommend a 22V zener or higher at 1W rating across the PAs. You know the drill. I think that someone may have mentioned the use of the 2.54mm headers like Diz used in the 5W for use on the PAs and this will allow replacement without having to get the soldering iron out. Some one come up with a replacement transistor. You have to have done it, none of the 'I think this will work' to lead us off into the weeds. TIA. FYI chuck, k7qo, trouble maker
Started by chuck adams @ · Most recent @
Peanut Power Spring - SUNDAY - 6PM to 7:59PM EDT
Come and have some fun, this Sunday! An easy one from North GA QRP CLUB! Check 2 things: 1. The*RULES*on the Sprint page:hhttp://www.nogaqrp.org/PeanutPower/rules.pdf <http://www.nogaqrp.org/PeanutPower/rules.pdf> CW/SSB/*DIGITAL* ....... QRP or HIGH power - 80/40/20 2. Check to see if you already have a number: https://www.dropbox.com/s/qoqkq4sa6tq4jrg/PPS%20Numbers%20by%20Call%202019.xlsx?dl=0 If not, sendkj4ym@... <mailto:kj4ym@...>an email to request a number! There are now over 300! Simple, see you on Sunday. And visit the nogaqrp.org club webpage. -- Jim Stafford W4QO Roswell, GA USA QRP ARCI #6515 www.qrparci.org NoGaQRP - Peanut #1 - www.nogaqrp.org G-QRP#7388 MI-QRP#697 SKCC#1281 FP#21 QRP- When QRO is simply not enough (fun)!
Started by Jim Stafford W4QO @
QRPGuys DSB xcvr 4
Gang, Been there. Done that. Attached are three photographs and below is log for the first few contacts made with the following: o Raspberry Pi 4 in 3D printed enclosure with 40mm fan. Found 30mm fans to be too loud. o Enclosure from https://tinyurl.com/y3teyqp3. Let me know if you figure out how to do without it being solid like mine. I'm no expert on 3D printing with my Ender 3 printer. o USB sound module from https://tinyurl.com/y5bkhsqq. Paid the $2 extra to get vendor from ebay in USA so that I did not have to wait on the slow boat. $3.95 today, Oct 3 2019, and let's see if the vendor does the usual ebay stuff of running the price up if there is a run on the critter. o Using Raspbian Buster Full version for O/S from raspberrypi.org downloads page. o WSJT-X V2.1 from http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html using the armhf.deb version of Version 2.1.0 in the installation packages section of the web page. K7QO log for 20m at 1W or less. I recommend you not run too much more than this or you will be distortion by over driving the audio section. Your mileage may vary. 2019-09-27,15:58:30,2019-09-27,16:03:19,WW5XX,EL09,14.075346,FT8,-14,-12,1.0,, 2019-09-27,18:02:00,2019-09-27,18:03:30,KQ6CA,CN87,14.075352,FT8,-02,-15,,, 2019-09-27,18:09:45,2019-09-27,18:11:15,KD5FOY,EM12,14.074410,FT8,+08,-15,,, 2019-09-27,18:33:30,2019-09-27,18:34:30,WF3P,FN20,14.074632,FT8,-06,-15,,, 2019-09-27,18:35:09,2019-09-27,18:35:19,WF3P,FN20,14.074632,FT8,-06,-15,,, 2019-09-27,18:54:00,2019-09-27,18:55:30,KJ7COA,CN88,14.074925,FT8,+02,-15,,, 2019-09-27,19:15:00,2019-09-27,19:16:31,K9ZW,EN64,14.075022,FT8,-12,-23,,, 2019-09-27,19:32:30,2019-09-27,19:34:00,AE4CC,EM13,14.075307,FT8,-04,-20,,, 2019-09-27,21:00:45,2019-09-27,21:03:15,K2AMF,DN17,14.074838,FT8,-07,-17,,, 2019-09-27,21:42:15,2019-09-27,21:43:45,ND6H,CM97,14.074576,FT8,-11,-24,,, 2019-09-28,00:13:00,2019-09-28,00:16:00,NE8O,EN83,14.075104,FT8,-10,-16,,, I have put the rig in storage for a while due to more pressing projects for the RPi4.4 course (K7QO YouTube.com channel) and more than 60 physics programs that I have written in the last 20 years and not published yet, so gotta get that done before they go to the landfill with the rest of the estate. FYI chuck, k7qo, beta tester
Started by chuck adams @ · Most recent @
AZ ScQRPions Meeting is this Saturday 10:45 at Fuddruckers, I-17 and Dunlap.
Be There! C U There Mike Baker K7DD
Started by Michael Baker @
Heads up! QRPGuys DSB Kit Available!
I just ordered my QRPGuys DSB Digital Transceiver kit. Really looking forward to building this, should be fun for only $40. N1ESE
Started by JT Croteau @
On The Bench -- WWV+ 10 Mhz project 3
This is a project started a while back with the MRX-40 in QST September 1997. With the recent activity for a 10 MHz WWV receiver, the project was revisited for my own amazement... ;-) My over-enthusiastic story in a simple HTML web page format is here... www.w5usj.com/OnTheBenchWWVproject.html ...including a lot of help with hyphens, U & L case and spaces in file names. Don't use them! But I did leave the Caps in for now cuz it's going to take some time to clean up. Chuck, W5USJ (ex K2OFN) ARCI 5422, SKCC 19956 EM22cv, Rains Co., Texas
Started by Chuck Carpenter @ · Most recent @
OT: Cleaning up vintage equipment 3
OFF-TOPIC - Skip as you may wish. I've acquired a 1950s oscilloscope. The exterior is cleaning up nicely with Simple Green and a toothbrush. But the inside is baked-on dust and fluff. Compressed air isn't cutting it. I don't see any paper parts so I'm willing to risk some kind of spray. What do you think? Old school potentiometer cleaner? Flux remover spray? Automotive carb cleaner? ¡ª Ed Skinner, ed@..., http://www.flat5.net/, 480-492-7664
Started by Ed Skinner @ · Most recent @
[4SQRP] Peanut Power RULES! Oct. 6
This one? It worked here... https://www.dropbox.com/s/vgp8dvkprwz26hy/PPS%20Numbers%20by%20Numbers%202019.xlsx?dl= 73 de Lee, AA4GA [email protected]> wrote:
Started by Lee Hiers @
KC9ON 20W SMD Dummy Load
John, 3rd Planet Solar, has a nice SMD dummy load kit in his catalog. < https://kc9on.com/product/smd-dummy-load-bnc/ > It uses really large SMD resistors and even with shaky hands and less than optimum vision, it's easy to assemble. Checking the SWR/RL with my MFJ-259C, it was essentially flat to 150 MHz, better than -28dB RL. One mod I did was to add a "traditional" peak detector to the other outputs provided: 1N270 and 0.1 uF. Picture available. I give it a 5 out of 5 stars. Chuck, W5USJ (ex K2OFN) ARCI 5422, SKCC 19956 EM22cv, Rains Co., Texas
Started by Chuck Carpenter @
Peanut Power RULES! Oct. 6 3
/JOIN us in this quick and fun non-contest contest. Whether you've played in this game before or not, grab your Peanut Power number (PPN) and see what kind of nut you really are. It's fun. It's quick. It's something unique from the north Georgians. Come out or stay in and play! Note: YOU DO NOT HAVE TO RUN QRP POWER TO PLAY!/ /**/*/If you don't have time to read this entire email, then go to: /*//http://www.nogaqrp.org/PeanutPower/rules.pdf *One change to rules*... if you *need* a Peanut Power Number, send KJ4YM@... an email. ___________________________________________________________________________________ OK, here are more details............ *Everyone plays.*.. Outdoors, Indoors, QRP or higher power, CW, SSB, even *DIGITAL*!.. There is even QRO! Sponsored by the North Georgia QRP Club (nogaqrp.org), this sprint will be held on*Oct. 6, 2018*from 6PM to 8PM EDT,*(Oct.6, 2018- 2200z to 2359z).* Your QSO will be worth more if you have a *Peanut number;*/_Y_//_ou now keep the same number each year.._/ To check to see what your number is, go to: https://tinyurl.com/y5xws6xu This short sprint is different from most other QRP QSO events. 1. It is *open to all amateurs at any power level*. We do this to attract some new folks to QRP while running theircomfortable power - QRO *(<= 100 watts pls).*All are welcome. This is a fun event, not cut-throat! 2. It is a *short sprint* lasting only 2 hours and not tying up the entire afternoon. Although a brief sprint, pleaserun reasonable CW speeds so that all can copy. 3. It starts *late in the day* (right after close of CA QSO party!) which means we start at 3PM PDT, later than most contests. 4. There are 5 categories covering a variety of situations - the prestigious category in the *Peanut Power*1W CW, 2W PEP SSB or less and *operating from the field*....it's the *GOOBER CLASS!*SOTA/POTA anyone? 5. Certificates will be awarded for each of 5 category winners (minimum 3 entries per category). 6. Sprint encourages SSB as well as CW contacts. The exchange: *RS(T), *State/Province/Country *(S/P/C)*, and your *Peanut Number *or *Power.*Call /*CQ NUT*/*//*//and have FUN! 7. Multipliers count each band/mode. Work*GA*(or any other S/P/C) on 3 bands and 2 modes (SSB and CW/DIGITAL) = 6 multiplier.* Puts emphasis on switching bands and modes during theevent.*Check SSB on the_quarter_hour. 8. We encourage activity on all 3 permitted bands - *80M, 40M, and 20M*. CW: 3561 khz, 7061 khz, 14061 khz SSB: 3999 LSB khz, 7999 LSB khz, and 14339 USB khz. Spread out from those frequencies. 9. Logs are not submitted -*simply a score*- but keep your log, in case it's requested for verification. Watch the NoGaQrP (nogaqrp.org) website for results. There is an online score calculator. It's all on the website -http://nogaqrp.org/PeanutPower/ppsscore.php 10. Work stations holding a Peanut Power Number (PPN) for 7 points. Stations worked not having a PPN (they will send power instead)yield 3 points. Yes, *QRO*stations may request a PPN. Remember, you do notdeclare a category /*until you decide to send in your entry*./If you get halfway through and change your power, simply enter in a different category than you originally thought.. *Peanut numbers are now permanent*. Don't know or remember your number?See<https://tinyurl.com/ybwarlh5>*https://tinyurl.com/ybwarlh5* If you have_requested a new number_this year, this page will be updated before Sunday, Oct. 6 To request your PPN, send an email to NoGaNuT Pete atkj4ym@... Requests for special numbers *may no longer be **accommodated.*Remember to include the phrase - "*PEANUT POWER NUMBER"*in the subject line of your request. But even _without a number_, get on and make some contacts, just _send your output power followed by a W_. Dang, those goobers are tasting great!http://tinyurl.com/olkg4za NoGaNuT Pete
Started by Jim Stafford W4QO @ · Most recent @
[4SQRP] QRPGuys DSB xcvr on FT8 mini-report {long]
Thanks for the report Chuck, I'm really looking forward to this project. N1ESE
Started by JT Croteau @
FT8 addon
A Siglent SVA 1015X Spectrum & Vector Network Analyzer image sent to me by Ken, WA4MNT, shows that the second harmonic is down more than 50dB from the fundamental. This has got to be much better than the other kits that have come out. My opinion and not that of any one else. chuck, k7qo
Started by chuck adams @
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