开云体育

I was thinking of the history of things. I remember seeing Dan Tayloe, N7VE, at Scorpion meetings here in the PHX area. He seemed to always have some project going. He got famous at work and disappeared on airplanes and hasn't been seen by me and others in some time. One of the things for his Manhattan builds and other techniques was that he used magnet wire for point to point routing. I am personally not that patient to use the wire. With the thermal insulation, you can "easily" melt the insulation at the ends of the wires. I sometimes do this with toroid windings, but most of the time I just scrape while I have the spool out and can lay the wire end of the spool and use the famous #11 Exacto blade to scrape the insulation. Then tin with the iron. With the magnetic wire, you can have handy wire sizes for all possible situations that arise. #30 to #00 AWG will get you there. Probably need a large budget allowance. just another thought that hasn't been brought up in a while. Any of you master builders have samples to show? Maybe try it if time and interest allows. Easy to cut to length needed. -- chuck adams, AA7FO WAS-17 QRP (4W) --> 28 States start Mar 1, 2025 QRPp WAS 20m POTA (1W) --> 5 States start May 30, 2025

Apologies for being lazy but wanted to expand my horizons and ask the assistance of the group. Being spurred on by Chuck's QRP efforts with a modest antenna installation and resulting WAS/WAC results, just requesting suggestions for my local limited-size QTH. I already have a set-up as follows: (1) Station in garage. (2) Decent but modest fan dipole in the attic along a 30 feet roof line. (3) Radiating dipoles covering: 40m, 30m, 20m, 15m, 10m. (4) Decent 1.5:1 SWR on all bands except for 40m. About 3.0:1 reduceable with tuner. Below is a map view of the QTH to give you an idea of scale. Want to add antenna on a patio adjacent to the shack. Of course, the QTH is antenna-restricted but can be "stealthed" from the other houses. (The neighbors are a pretty decent sort.) About five years ago, when I was doing PSK-31 and some modest CW, a 20m vertical served me well in that spot -- even with modest radials -- and I was able to do the Pacific and the East Coast at various times during the day. But I was looking to employ the newer SOTA and POTA concepts that have come along and add additional bands from 20m on down. From my time up at the Zuni Loop site and when I was more agile and mobile (we do grow old), I had constructed a couple of antennas that involved one of those push-up poles inside a PVC pipe that had a "spike" that held the PVC and push-up vertical. It was "guyed" and allowed me to push up a radiating element about 17 feet or so. The idea I had was to feed it at the base with coax that leads back to the shack through the vent hole where a tuner could be employed as necessary. (See pictures below.) This is the pinnacle of laziness, I realize, but I an just trolling for ideas and brainstorming as it were. I'd be most grateful for suggestions and I'll do the technical run down. Thanks in advance. -- William, k6whp -------------------- "Cheer up, things could get worse. So I cheered up and things got worse." PATIO FROM BEDROOM VIEW Approximate dimensions are 12 feet by 9 feet. ACCESS TO SHACK VIA VENT

Hi Everyone I've been working on a new transceiver project. I was so pleased with the uPDCR (a small phasing receiver with AI voice) that I thought it would be fun to turn it into a transceiver. So I've combined the transmitter section from the iqSDR40 with the uPDCR and built the uP40 (links below). I really wanted it to fit into the next size up Hammond case which is 80x54 mm, so the PCB needed to be 80x50 mm. Instead of using the usual bifilar transformers wound on FT37-43 toroids, I thought I'd try a small surface mount common mode choke. Also thought I'd try one of the small surface mount RF MOSFETs designed for VHF, UHF the AFT09MS015N. I was very surprised and happy that all the components fit on the PCB! The uC and PWM filter parts are on the bottom and everything else is on the top. Then I started routing. I've pretty much standardised on using 4 layer boards but it became obvious pretty quickly that there was no way to route some of the longer traces because of the density of the components. OK, so I had a look at prices for 6 layer boards from JLC PCB and it's really not bad. So top layer is for RF signals, layer 2 is ground, layer 3 is for some uC control signals, layer 4 is 5 volts, layer 5 is ground and the bottom layer is mostly for digital signals. All layers also have ground and there are plenty of stitching vias. In the end I got 5 boards for about US$5 (shipped to AU) with a discount applied. I built the transmitter section first and tested it with a signal generator. It worked fine. Got 5 watts. So the MOSFET and the common mode choke worked fine at HF! I also updated the firmware to announce the mode and the frequency step. uP40: https://github.com/ianm8/uP40 uPDCR: https://github.com/ianm8/uPDCR iqSDR40: https://github.com/ianm8/iqSDR40 73, Ian VK7IAN

Ordered another set of 10 boards. Here is what I get billed for. Subtotal: $ 5.00 Shipping Cost: $ 6.34 Paypal Fee $ 1.17 Duty & Tax:vat help $ 8.00 All Total US $20.51 I still don't mind paying $2 per board, but someone is getting some extra money somewhere in the chain. They still thinking that the 145% tariff is still in play? Is it? Just wondering. The board is a combo of the G3UUR scheme and my article in QEX some time ago as K7QO. I'll publish the Gerbers as soon as I am sure I won't get burned at the stake for any major errors. :-) -- chuck adams, aa7fo QRP WAS 17m started Apr 2, 2025 WAS-17 QRP --> TX,FL,SC,GA,OK,AR,KS,AL,AZ,MN PA,CA,CO,WI,NE,ID,IL,NC,NY,WV MA,OH,OR,RI,MT,WY,WA,MI DXCC W,VE,JA,PY,ZL,TX9

All, Would a simple diode detector be a (relatively) accurate way to measure RF power? I suspect my o'scope is reading RF incorrectly. I have 4 different x10 probes and with each one I get dramatically different results, up to a 30% difference. So, I can't trust my scope!! Thus, measuring RF power presents a problem to me. I don't have access to any calibrated power measuring devices, but am quite confident of the calibration of my DVM. Or, if diode detectors are inaccurate, do any of you have any tried and true ways to measure RF power with a decent degree of accuracy...say within 10%? W2EB Bill Lazure