开云体育

I built a beta version of the DSB transceiver, which will be available via the QRPGuys.com web page sometime in the near future upon arrival of parts. I built the kit according to the PDF from their web page. My days of writing new manuals has passed. Too much effort. Little return on investment of time and energy. The kit went together without any problems. The diagrams and step by step instructions are just fine. I found some typos and some missing wire lengths needed by newbies. Ken has revised the manual and will probably have another done before the kits start shipping. Installed WSJT-X V2.1.0 on a RPi4.4 (4GB model) with 240GB SSD (not needed to run the program) and a $4 USD 3D USB audio module off of ebay. Paid the $4 to get a US supplier instead of $2 to get one coming on a slow boat. I can safely say I was the first to use a RPi4 to do FT8 with a QRPGuys DSB transceiver. I made a mistake of setting the upper freq to 1400Hz and have yet to find the config file or see an obvious way to extend the band. This should help find more contacts. I used an OHR WM-2 wattmeter to set the output at just 1W. I did not want to risk over driving the audio. Remember I used to do CW when I was active. This is on 20m using my dual MFJ mobile whips in a dipole configuration at 7m above the patio. Worked over 20 Qs today and had 3 busted Qs as the band faded on me during some exchanges. Heard some DX, both today and last night, but too many competing stations with much higher power and antennas. Rig works just fine. I now have to find a way to get the log and I am assuming that exporting cabrillo format is the way to do it. Manuals don't help too much. Manual does not show way to expand band either, that I can find. I'm asked about other modes in emails. I guess you can if you change out the crystal or go to a DDS to replace the crystal. There is a pad on the board to do DDS. I am not a real fan of sitting at a computer and using a mouse to make a contact. Sorry girls and guys. I'm going back to the paddle and 20m CW to try for DXCC before the end of the year. Got CQ WW DX coming up soon. For $40 for the kit and 3 band modules I think you will get your monies worth for doing FT8. I don't have clue what the other station is seeing on the waterfall with a DSB signal. Probably double the bandwidth or their superhet rejects the other sideband. Someone asked me to do a video. Not going to happen. Sorry. I've got too many left to do. :-) The RPi thread has been terminated for qrp-tech. Also the ping series. I put the group back on moderating status. FYI chuck, k7qo

With the USB-C cable/charger bug on the pi 4, it has had me wondering how to power it properly from 12V. Anyone running their pi 4 from 12V and mind sharing with me how. I haven't bought a pi 4 yet, been debating whether to go with the 4 or 3B since I want to run exclusively from 12V (I live off-grid on solar power, everything is 12V). I'd really like to go with the pi 4 however. Thanks

I don't know how many readers here are into scratch - build. Anyway, I can't just toss these. I have 2 "wideband amplifier boards" from Northern 550 hybrid SSB boat radio. 4.5 x 2.5 inches, 5 transistors, 2 - 23 MHz. Final is 2 parallel 2N5641. Spec per manual delivers 5W PEP into 100 ohms load; was driven by one MOSFET RF amp at 0.7 - 1 volt drive. Board was to drive directly the grids of two power tubes at about 200W PEP. Has what it calls an output transformer but it's really just a ferrite wound choke; looks like 11 turns and it could be tapped down. Looks like mounting against radio chassis sinked the power transistors. I have about a half dozen JPEG scans from the manual; schematic, parts list, text description which I can email. Removed from retired equipment. NOTE, looks okay BUT untested. I want $ 14 each, mailed. -Hue Miller Newport, OR

Chuck, Just wanted to let you know how much I enjoy following along with your Raspberry Pi 4 Course. I especially like your pieces of history you are throwing in about C, Fortran, VAX computer, etc. It is very interesting. I ordered a Raspberry Pi Zero W kit with camera about 2 weeks ago and I am having fun learning how to use it. Today I took the plunge and ordered a Raspberry Pi 4 kit with 4G of RAM. I am looking forward to learning how to use it for amateur radio projects. I am afraid that I am slowly moving towards the darkside and except for CW will probably be going totally digital here, lol. The first program I will install after getting my Pi 4 will be fldigi. Hope you are having a great day Chuck! Alan, N8WQ

A lot of resources are wasted on tons of out of fashion but still good cell phones!! Why not rescue the text mode together with the key board and the lcd display for use as CW keyer and decoder? Old nokia phones lcd displays are already in use in dds vfos. Has any one started this project?Will be very glad to hear someone have made a success out of this idea!! 73Emi, DW3 CBO

I hope to get a shear soon but what about using a table saw, radial arm saw or bandsaw for sheet aluminum. I have all three of these in my shop. There are some videos on YouTube. Comments or suggestions? Jim WB4ILP

I get emails from instructables.com for all kinds of projects. Some of them are electronics and today I got one on building a signal generator. https://tinyurl.com/y538tos4 I leave it for someone in the group to build and review this for the start of the building season this fall and winter. FYI chuck, k7qo, he who stares at 01001000 combos all day :0) PS here is a sample 00000000: 7f45 4c46 0201 0100 0000 0000 0000 0000 .ELF............ 00000010: 0200 3e00 0100 0000 6007 4000 0000 0000 ..>.....`.@..... 00000020: 4000 0000 0000 0000 a041 0000 0000 0000 @........A...... 00000030: 0000 0000 4000 3800 0900 4000 1e00 1b00 [email protected]...@..... 00000040: 0600 0000 0500 0000 4000 0000 0000 0000 ........@....... 00000050: 4000 4000 0000 0000 4000 4000 0000 0000 @.@.....@.@..... 00000060: f801 0000 0000 0000 f801 0000 0000 0000 ................ 00000070: 0800 0000 0000 0000 0300 0000 0400 0000 ................ 00000080: 3802 0000 0000 0000 3802 4000 0000 0000 8.......8.@..... 00000090: 3802 4000 0000 0000 1c00 0000 0000 0000 8.@............. 000000a0: 1c00 0000 0000 0000 0100 0000 0000 0000 ................ 000000b0: 0100 0000 0500 0000 0000 0000 0000 0000 ................ 000000c0: 0000 4000 0000 0000 0000 4000 0000 0000 ..@.......@..... 000000d0: 0c37 0000 0000 0000 0c37 0000 0000 0000 .7.......7...... 000000e0: 0000 2000 0000 0000 0100 0000 0600 0000 .. ............. 000000f0: 183e 0000 0000 0000 183e 6000 0000 0000 .>.......>`..... 00000100: 183e 6000 0000 0000 5c02 0000 0000 0000 .>`.....\....... 00000110: 68fe 4f0f 0000 0000 0000 2000 0000 0000 h.O....... ..... 00000120: 0200 0000 0600 0000 403e 0000 0000 0000 ........@>...... 00000130: 403e 6000 0000 0000 403e 6000 0000 0000 @>`.....@>`..... PSS It's really not that bad. Just a joke for those who may have to some day recover long lost valuable data and programs.

Unique chance to grab unassembled genuine kit on eBay: https://www.ebay.com/itm/NorCal-40A-Transceiver-Kit-unassembled-and-the-Book-The-Electronics-of-Radio/303275236764?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160727114228%26meid%3D87c12a4c7dda423484ec42bc1c61a201%26pid%3D100290%26rk%3D2%26rkt%3D4%26sd%3D123863443543%26itm%3D303275236764%26pmt%3D0%26noa%3D1%26pg%3D2060778&_trksid=p2060778.c100290.m3507 (I am not the seller) Petr, OK1RP

Gang, I lost my 1TB SSD drive this last week and I have been hunkered down trying to restore everything to its original state as best I can. Because of the Raspberry Pi 4 project I had not been doing the usual due diligence in backups and for that I am hoping that I have not lost too much. You know the drill. I wrote a program for a computer company a long time ago to erase disks before they were drilled, compressed and shreaded to micro-particle sizes and then incinerated at solar temperatures for final state for disposal. I also wrote a recovery routine and that I am thankful for as I can recover most, if not all, of my files. It is just time consuming. The good news that I am going through 40GB of backups in the process to hopefully save some time. I found some stuff that I had forgotten about or thought I had deleted. Before I give the list so far, please read the fine print on my web page. It is important for my mental state of mind. 1. The CW books. I will put some of the old CW books on my web page. I have the title and the speed listed. You should know who the author is, so please don't ask me. The speeds are for the whole disk. Do not ask me if I can do another speed. You adjust. These books should help you practice 'copy in your head', which isn't a big deal as people make it out to be. I prefer to know how you do at hard copy. I think I can keep them out there for some time, but you had better download them today. No guarantees. I think I have unlimited space, but I'll do them until the web provider sends me a bill. People ask me why I quit doing the project. I was standing at a hamfest talking to someone that I knew. He had a buddy with him. He introduced me to his buddy and then said. "Chuck used to do the books in Morse code. Like the one I bought and gave you a copy of." And he was wondering why I quit??? Duh. I am putting the code in ISO format for each book and this includes the text files. So they are large. They will remain the same size. I am not going to redo them for you. AND, after I upload the ISO file it is deleted from my drives and will not ever return. Also. You do not have the right(s) to copy to another site and provide them now or EVER. Please. And people wonder why I have an attitude. Now you know. 2. The PDF documents for build projects I will post as soon as I can find them and get time to put them online. I got an email yesterday from someone that was wondering where the hx108.pdf document went. I had the thing up there for almost a year. He should have downloaded. I am not a library and I get tired of my work and I do reserve the right to take it down. Either get the project done or download the material. So. As a final parting shot. Do not cross post this to any other site. Do not copy the material for purposes other than your own private use. Do not put the files on your site or other sites. I will not be a happy camper. I will not list nor will I allow anyone to create a list of my material and post it. Let them go to https://www.k7qo.com/ and do the work themselves. If they aren't interested, then so be it. So, keep monitoring my web page. I need the hits. I am not going to advertise here or anywhere else as to the material placed online. And I do reserve the right to discontinue if I feel that I am being used or if some one pushes me in the wrong direction. No guarantees and the sale is final.. enjoy while you can, chuck, k7qo

I started to work through The Electronics of Radio book. I can't figure out how to calculate the combined internal resistance of the capacitor and inductor in problem 8 A. For that problem a 7MHz sine wave signal is fed across the variable capacitor C1 (9-50pF) and inductor L1 (15uH). Amplitude of the signal is 1V peak-to-peak. The assignment states to tune capacitor for resonance, the spot where the voltage measured across both is lowest. My test showed a voltage of about 260mV when tuned to resonance. Measured capacitance is 34pF. Calculations agree that the capacitance should be 34.5pF. Now the problem instructs "Use the voltage to calculate the total resistance of the capacitor and inductor." I'm confused on how to do that without knowing/using the current. Am I missing there just a simple formula? Thanks, Claus

Nick, I think that would be .5 Vp or 0.3535 Vrms The voltage is 1 Vpp. Should that be converted to RMS (0.707)? Chuck, W5USJ (ex K2OFN) ARCI 5422, SKCC 19956 EM22cv, Rains Co., Texas

Hi folks, I am looking for NorCal SST. Let me know if you have something ready for new home please. 73 Petr OK1RP

I. RECENTLY ACQUIRED A USED 2011 HANDBOOK. UNFORTUNATELY THE CD WAS MISSING. DOES ANYONE HAVE THE CD FOR THIS HANDBOOK OR COULD MAKE ME A COPY. CONTACT ME DIRECT AT W4BWS1 AT GMAIL DOT COM. THANK YOU. Dr. Don W4BWS God Bless All Ham Radio does not make the world go round. Ham Radio is what makes the ride worthwhile.

Its that time boys and girls, the first of the Month get together for Burgers, Bragging and BS. Hope to C U there... K7DD . .

You question, in all caps and without question mark, brings up an interesting point. I have purchased a lot of the handbooks over the years, especially since a group of us reworked it in 1995. But, the ARRL keeps taking projects out of the books. Sad case of dumbing down the ham population. IMHO. Putting the projects in other books to increase sales doesn't make me a continuing customer. But that is just me. Here is my collection and the size of each book: 248M 1931hb 107M 1968hb 157M 1976hb 124M 1981hb 109M 1995hb 114M 1996hb 627M 1997hb 106M 1998hb 107M 2000hb 115M 2002hb 248M 2003hb 162M 2004hb 299M 2005hb 303M 2006hb 241M 2007hb 395M 2008hb 376M 2009hb 581M 2010hb 688M 2011hb 471M 2012hb 906M 2013hb 990M 2014hb 680M 2015hb 1.7G 2018hb I collect old HBs at swapmeets to scan in, but I haven't gotten my Kodak i1120 to work with Win10, so the project is on hold. I'm not a fan of Win10. More it's a problem with Kodaks support of their software with the system. It's broke and I don't have time to work on it. I would prefer that the ARRL quit killing trees, since they are on fire now, and offer a deal on just the DVD. OK. Back to regular programming. MAY I request that you do not post to this forum with ALL CAPS. It irritates the moderator. :-) chuck, k7qo

My Raspberry pi4 switch... https://www.youtube.com/watch?v=e8OGGVdyYVQ&feature=youtu.be 73' PD0LEW

This may have been posted but if so, I missed it... Found this website: < http://www.lodestonepacific.com/coilforms.php?gclid=EAIaIQobChMIlvTdkdyn5AIVD9bACh3bEgBSEAMYASAAEgJDiPD_BwE > From the Finished Coils List, found a mechanical drawing with the info. < http://www.lodestonepacific.com/pdf/L40%20Issue%20K,%20Rev%201.pdf > Chuck, W5USJ (ex K2OFN) ARCI 5422, SKCC 19956 EM22cv, Rains Co., Texas