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Good job! Will be interesting to build ...
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On Tuesday, June 25, 2019, 5:20:22 AM GMT+3, chuck adams <chuck.adams.k7qo@...> wrote:
It is fun to build and even more fun to operate. Attached is photo of 5W20 for 20m, S/N 001 as Diz has S/N 000. He used PCB#1 series and I used PCB#2 which is a production board before a couple of minor cosmetic adjustments. I built this rig using only a schematic.? Diz sent me two of the binocular transformers used in the driver and final PA sections.? I used all the other parts from my own stock, so the photos will reflect some different parts that you will see in the kit when it comes out in July.? Watch the home page of kitsandparts.com for release details. Diz will post on the 1W + 5W reflector. Diz and I exchanged a number of emails and phone calls to get things worked out for you guys and girls. I will release a 200 page PDF build guide sometime after Jun 1. Build and test.? I'm fine tuning the manual in the next week and will have Diz review it before final release. I will not be doing videos like I did for the 1W.? Not worth it for only 100 people seeing them.? I took a photo of almost every part installed, up close and personal. The 5W is a 1W on steroids.? The setup you see on the workbench was the final tuneup before making an enclosure (also in the manual).? I did the enclosure Saturday in about an hour at lunch time as 20m was dead as a door nail at this QTH.? Only a couple of signals heard. Took the rig to my local park 1km away at sunset when the band opened up.? This to test my new GPS gel cell you see in the photo, 9AHr 12V bought at the local Gruber plant for $15 and some change.? Ran only 4W as I had added a small heat sink to each PA transistor and need to run some more tests before going to a full 5W.? I did not want to start an exercise and lose power to the antenna. I worked 52 Qs, 22 states and 6 1E stations.? I am glad that I installed the optional CW speed pot. Helped with the wide range of CW speeds.? Good to see the new operators on the night shift as the old guys work days and then take a long nap.? :-) I'll give a more detailed review in July for your consideration.? I used 3-pin 2.54mm headers for the PA finals.? Figure they will blow if SWR is high with the higher power level involved.? I have several experiments to do in the next few days on the PA section.? I added a heat sink with epoxy to each PA transistor after the photo was taken. The kit will use a nut and bolt system. I also recommend a digital display and a 10T pot as the rig tunes a large range on 20m. I'll show a photo of the enclosure in a day or two after the paint drys.? Used the bare aluminum enclosure at the park as I knew what everything was.? :-)? We have a sail covered table and bench with water cooler and restrooms about 10 m away. FYI chuck, k7qo,? 22 states to new WAS on 20m at new new power level for me.? 1 country down for DXCC. On 6/24/19 1:35 PM, Michael N6MST wrote: Just came across this on the QRP Labs group, thought qrp-tech would be a more appropriate place to discuss it. This looks like a pretty fun radio to build! |
