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Hi All, I assume there are quite a few members out there that program PCs in their favorite language. Just thought I'd check with y'all before I go further with this work: Here are two example links: http://5watters.com/?states=CT,OH http://5watters.com/?states=ca,ri,ia,MS,Fl I think you get the idea...If you have a database of QSOs, you can easily generate a WAS MAP. I searched the WEB and did not find anything out there that does that function. Anybody? 73, Diz, W8DIZ

I stand corrected. I did a quick search and found that the DL4YHF frequency counter code is open source. https://github.com/TheHWcave/PIC-freq.counter-modification/blob/master/counter_TheHWcave.asm So after the IF NC40A experiments I can go off and do a fixture for crystal matching that may (note the word 'may') be easier to use. Yet another rabbit hole. Love the movie 'Holes'. chuck, k7qo, in the desert digging holes

A discussion on the differences came up somewhere not long ago. I had made some measurements while re-doing the filter in my ATS-3 and also when using the "short" crystals in another ("measurement receiver") project. They (the short crystals) showed good Q in comparison with the HC-49/U crystals and I didn't pay much attention to the relative Lm and Cm values until I found some info from Wes Hayward saying that the reactances are much larger in the short crystals. Well yes, it was as plain as it could be that the short crystals had Lm values three times as high as for standard height crystals on the same frequency. Hayward said that the differences could make filter design with these crystals more challenging. I haven't looked at how it affects "pullability" of the crystals in a VXO though. 73- Nick, WA5BDU

In a quick search I found the following. https://tinyurl.com/y3s9uunu 50pcs 4.9152MHz HC-49U crystals for $7.20 USD with free shipping to the US. They have 296,991 lots available at the time, but that includes the same deal for 5.000MHz and 6.000MHz. I calculate that is $0.144/crystal unit. Let me know if you find a better deal other than buying a 1,000 units per frequency. It looks like to me that there is interest in a number of people doing the NC40A. A number of us have boards that were done in China from the layout that is in the files section and documentation is also in the directory. As member of the group go to the groups.io web page and log in and access the files section. Directory is on the 5th page and has the name /g/qrp-tech/files/Winter%202018%20Project%20%231%20--%20%20NorCal40A%20qrp-tech%20PCB and hopefully the link will be clickable. The Gerber zip file is second from the bottom. Old pricing was $5.49 for 10 boards. It's now $5 but you have to add on DHL shipping for another $17 or so. I will, in the next week, build another NC40A, but I found some 9.000MHz crystals for a nickel each and I wanted to do an article of HC-49U vs HC-49S using the same IF frequency doing a detailed matching procedure two ways and investigate the results. You may have already done this. 9.000MHz used to be the standard IF back in the day as you could do multiband radios with the same IF frequency. It's the reason for the LSB and USB standards for the ham bands, which you are free to ignore at your own choosing. Using the 9.000MHz IF frequency means raising the VFO by an additional 2.0MHz for the NC40A, but that doesn't bother me. FYI chuck, k7qo, shopping the Internet for deals

I apologize for the rash of postings. Here is a quick list of URLs to see some online material on crystals and matching methodology. https://www.qsl.net/w0pwe/HB/Xtal_Osc.html https://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2009/QEX_Nov-Dec_09_Feature.pdf http://www.w0qe.com/Projects/crystal_bandpass_filters.html https://www.electronics-notes.com/articles/radio/rf-filters/what-is-crystal-filter-basics.php https://www.k8iqy.com/testequipment/pvxo/pvxopage.htm http://www.giangrandi.ch/electronics/crystalfilters/xtalladder.html https://www.qsl.net/m0ayf/QRSS-Band-Pass-Filters.html https://www.murata.com/en-us/products/filter/crystalfil/matching ~ 1. Look at the web page for Jim, K8IQY. Must read and look at his table (on a separate page that he links to. Also note his research on grounding the crystal case. Diz in the 5W and 1W grounds the crystal cases. I don't, but that his my own OCD problem. 2. The last link by Murata. Section 3. Note the effect of a 1pF error in the interstage capacitors and the effect of the shape and bandwidth. How many of us match the caps. Looks like it is more important than matching the crystals at first glance. 3. Giangandi has an online calculator with choices of the number of poles for the filter. FYI chuck, k7qo

Am attempting to join multiple complex-shaped ferrite pieces, namely TV-yoke cores. Many of these are split into two halves. In any case, they will be re-wound with copper in a way that will direct magnetic paths through the join gap. More that a few will be joined. A gap-free joint is wanted, so magnetic paths are evenly distributed through the joint and not confined to small regions where mating surfaces contact while other regions have some air-gap. Seems to me that ferrite is glass-like, so mating surfaces might use lapping techniques. Mirror-like surfaces not required. Wonder if anyone has experience here (I don't)? Would wet emery papers work? Aluminum oxide or silicon carbide powders?

GE Gentleman, I wonder if anyone might have a built Norcal 40a for sale Or a Wilderness Radio Sierra? I would much appreciate hearing from you. Tks es 73 de VE3VTG Good on QRZ

For those that may be interested. I have placed Version 0.90 of the K7QO 5W 20m Assembly Guide at https://www.k7qo.com/5w.pdf The document is 211 pages at this point and will change a little over the next week, with your help. It is written for my build of the 5W 20m prototype using what Diz called PCB #2. There were a couple of small changes to the production board that don't effect the build at all. J1 was moved as Diz did not like it close to the standoff hole and he added some heat sink mounting holes for the PA. The document is a 'guide'. It is not meant to replace the build instructions that will appear on the 5W web page at kitsandparts.com Please note. I built this unit, which Diz gave the official S/N 001 as his is S/N 000, and I did it with my own board and with my own parts except for two binocular cores that are new to the 1W and 5W series and the set of crystals that Diz contributed to the project and for which I am very thankful. Photographs may contain parts that are different from the production kit, so it is up to you to be able to identify parts by using the official web page of Diz at kitsandparts.com in Tampa FL USA. If you are going to build a 5W, and remember that I have all the parts listed for the 20m only version, then you may want to take a look at the above before you receive your kit to give you some idea of one way to build it. Because the document is so large, I seriously doubt that anyone will or even want to print the thing off. It's going to be more expensive than the kit. IMHO. Let me know if you find something in error or a better idea. I built my transceiver using a previous version of the schematics and I have to go back in and change the highlighting and add some sections to be highlighted in the manual so as not to confuse anyone, even myself. Someone sent me an email or posted that they were looking forward to the video(s). Won't be one unless someone pays me to do it by buying a kit for me to use in the process. I can be bribed. I think the manual above is better than a video. Look for me on 20m in pursuit of WAS (22 states and counting) and DXCC (1 country and counting) with the rig. I'm running at 3W until I get my heatsinks off the boat and I may not change even that since the spots are coming back. :-) See the last chapter in the manual on what I did for the heat sinks. I think I'll be around 14.054MHz as shown in the front view photograph. Spots on reversebeacon.org site. My A/C died in the lab yesterday, so I'm off the bench until the guy gets here in the morning. Off to work on a Raspberry Pi 4 that's still in the box. I am working on an enclosure manual and video and hope to get it done ASAP. See the last chapter on my resulting enclosure that was built in a short period of time. Like an hour without the painting. The digital display is a qrpguys display with a board layout that I did to allow me to 'floor mount' it without having to use holes in the front panel. Used the Keystone 621 right angle 4-40 tapped brackets found at Mouser and other vendors. I'm looking forward to working a large number of you on 20m with this rig and your 5W. FYI chuck, k7qo

Hello Paul, I have been using expresspcb.com's free SCHematic and PCB layout software for over 15 years. Their free software has a very easy learning curve...just plain intuitive to draw schematics and do the PCB layout. The GOTCHA is that expressPCB does not produce Gerber files for PCB production...they force you to use their PCB production house...however... I found someone that wrote a Windows Only software package that will produce Gerber files from express PCB source files. I used that software to produce the 5Watter PCBs...and they are beautiful. Note that you must you an earlier version of expressPCB software...the latest version will not work. I can help anyone that wants to pursue this path for PCB production...just email me in private. -Diz, W8DIZ

Hi All, Before I ship, I was waiting for one more part, a power connector to add to the kit. Found out that the part will not arrive until mid August from where else...China. So.... I shipped all the kits ordered TODAY. If / When the power connectors arrive from China, I will not mail that one solo part due to shipping costs...but in the future, if you place an order for anything, I will include the connector in that shipment...hope you all understand. SOoo...most of you should receive the kits either Friday of Saturday...Sorry UK, Japan, Ireland...you'll have to wait a bit longer. I will have the full documentation available on the website <http://kitsandparts.com/5watters.php> some time Friday. The first North America QSO that I have with a 5Watter...will receive a full refund for that one kit - Chuck Adams is not eligible :) and the first other DX QSO that I have with a 5Watter...will also receive a full refund for that one kit. 73, Diz, W8DIZ

Last night we were talking about the 2N2. I quess I am going to have to order the parts for mine. I'll use it with my DDS VFO. Does anyone know about the NW8020. That's another PCB ser Farr Circuits has. It looks to me like it may be a decent unit. None of these things are perfect. It looks to me like the NorCal stuff led to the founding of Elecraft. I wish we could buy "SHORT" kits. Kits that have the PCBs and components not easily available from the normal distibutors. I'm going to have to get some toroid cores and wire and try winding some The last I did were several years ago for a SoftRock Rx. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

Hi All, Some of you may (or may not) find the below text interesting. A short history of the Organic 5Watter Transceiver <http://kitsandparts.com/5watters.php>. 73, Diz, W8DIZ The Organic 5Watter VCXO Transceiver's Development History Based on the 1Watters. The 5Wxx is an offspring of the 1Watters, which was developed in mid-2015 at a suggestion from Chuck Adams, K7QO. Chuck told me that he could use a code practice oscillator for teaching/training/class educational work. Two days later I suggested a 20 Meter 1Watter which would use a dummy load to transmit & receive in a classroom. We ended up creating a VCXO transceiver with an IF of 6.00 MHz and 8.084 for the VCXO (both surplus xtals from ebay). The band span was small, only 14,055 to 14,062 but good enough to cover the QRP freq and useful in the classroom. With the success of the 1W20, we developed 1Watters for all nine HF bands, 10, 12, 15, 17, 20, 30, 40, 80, & 160 meters. This required the purchase of over 10,000 crystals, most of which had to be manually matched for use in band pass filters. Over 1000 1Watters were produced in the next 2-3 years... and we ended up with an abundance of matched surplus crystals. What to do with surplus matched crystals? Create 5Watters :) To keep the cost of the 5Watters low, I had to find a source of inexpensive RF transistors. I did not wish to use FETs, probably because I have a phobia with matching, loading and exploding parts. The old CB transistors are getting more expensive and anyway, most are fake Chinese parts sold on eBay. By accident, I found that the surplus 2SC5706 transistor can do a great job configured as a pair of push-pull finals. The FT of the 2SC5706 is 400 MHz, capable of more that 5 Watts RF output each, up to about 30 MHz. The issue with the 2SC5706 is heat dissipation...it is a Surface Mount Device where the tab is usually soldered to a PCB. To dissipate the heat, I decided to solder the final transistor tabs to a copper strip base available from GeorgiaCopper.Com <https://www.georgiacopper.com> I created a dozen Copper/PA Assys; only one suffered from over-heating due to multiple attempts to orient the transistor on the copper. Testing proved the PA Assys to be a success. Only once did I blow the finals; I powered the transmitter with no load on the output and POOF...all the smoke came out; seems I forgot to install Zener Protection in the output circuit...now fixed. In my attempt to remove/replace the finals in the PCB, I came up with the brilliant idea to use sockets for the finals and the stupid idea to use my surplus stock of cheap 8 pin DIP sockets that could be cut up to make two 3-Pin Female Sockets. The result was that the PA Assys made a sloppy fit in the the sockets. Per Chuck, K7QO, he said..."I use standard commercial 3-Pin Female headers". Duh...Thanks Chuck...the true 3-Pin Female headers hold the PA Assys securely...very nice to be able to replace finals with no desoldering !!! Chuck also suggested that soldering Finals to Copper may not be a good idea for novice hams/technicians. I found that a very common half inch Aluminum Heat Sinks (eBay) could be securely connected to the small metal tab on the 2SC5706 by using a lock nut with a free spinning washer. The Aluminum Transistor combination worked well but I think the Copper Transistor combo provides lightly better heat sinking. (YMMV) The 5Watter Kits will include the Aluminum Heat Sinks; An optional Copper Heat Sink Kit will be available at kitsandparts.com The 5Watters for 20, 30 and 40 meters are all capable of over 5 Watts RF output at 12 volts. The 5W17 is able to produce 5W but only at 14 VDC. My initial plan is to build 500 kits; 50 for 17M, 50 for 30M, 170 for 20M and the rest for 40M What makes the 5Watters Organic? Organic is a sales/marketing term used to increase profits and sales...It can mean anything you want it to mean. I use the term to designate that the 5Watters are all analog (not digital)...and increase sales :) 73, Diz, W8DIZ, 7 July 2019

Anyone know what this is? Can anyone suggest a suitable replacement for this core in order to make a Guanella 4:1 current balun. Thanks in advance. -- William, K6WHP "Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"

Hi all, A friend of mine just gave me a Kanga L.C.K. CW transceiver kit. Unfortunately the box does not contain any instructions. I searched the internet and found nothing on this kit. I would be very happy If someone could send me a copy of the manual, or at least of the schematic diagram. Thank you very much in advance, Claude, HB9CGL