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OOPS OOPS OOPS My bad. I had the columns reversed. If you read about 2.5 volts on all 6 active pins, then the IC is functioning normally. BTW, if you were to check the voltages on pins 1 and 2 while

If you mosey on over to the CalQRP group they've just announced a new wattmeter project. If you are willing to skip the SWR meter part (maybe use your QCX with a resonant antenna) this looks like a

I have a Diamond SX-600 that has a 0-5 volt scale. I get 3.6 watts at 12.5 volts, guess that’s about average. 73 wd4dda Preston's iPhone

Hi Tony, if you are looking for lost audio and you already have an amplified speaker then all you need to do is use the amplifier to search around for places where you have a signal and follow the

Above picture is made with the receiver module, a tunable BPF and HDSDR in 192kHz I/Q input mode (almost no LO peak at the middle!!!! Excellent design!!!) The filter starts at at the top of the

I haven't tried that yet. I'll give it a try tonight. Skip KG5SW

I agree with both of you. The 16 bit ADC limits the dynamic range. The LW station was the strongest present signal, could not find any stronger signals The -110 dBm is the actual reception noise level

Tony The same as with the screwdriver, audio test. I just feel that a pin is safer, not so much chance of shorting something. 73 Alan G4ZFQ

Alan, I have 0V on the gate of Q7 (same with other two legs) Screwdriver test elicits no hum (also these joints are good) Not sure what you are asking me to do with a pin on IC10-6&7 Thanks! 73, Tony

I found one of these from someone selling it on Facebook. http://www.mfjenterprises.com/Product.php?productid=MFJ-873 I share this meter between my QRO rig (Yaesu FT-920) and my assorted QRP rigs.

I actually did this mod twice. First with the .1mf caps. I did this on my 40m version and when I removed the old cap and put in the new I did not have ANY audio. After investigating I found that I

I'd have to disagree, I'd say an SWR meter is more difficult to build, Stockton uses toroids, prepped coax and needs some care taken with how you stuff it into the box or you get 'cross talk' but as

Tony That now shows IC8/9 are as expected. In similar RXs I've known C45, 46 voltages to vary according to tuned frequency. This will make IC5-5 differ. IC6-3 probably depends on the position of R24.

What results did you see when you listened for the two oscillators (20 mhz & 27 mhz)? -- Wes AE6ZM Sierra Vista, AZ

Ahem. Sorry. Here it is.

Tony, I do not see it. 73 Alan G4ZFQ

Hi Alan, Erik Agreed... though everything is a compromise. Ability to manage 200 users simultaneously, across all of HF is impressive indeed. However your quoted difference between a strong and weak

Erik, I said "Taken to the extreme" Your figures do not give other vital parameters. Yes, it is a good receiver but I'm suggesting that it would be even better for a particular frequency of interest

Jim, Why do you say that? The readings on the chart in the QRP Labs manual are made with the low impedance internal meter. Tony, using a high impedance DVM said "The voltages around IC8 and IC9 are

I have measured the voltages with the internal meter to be more consistent with the data. There are some glaring differences! Here is my new, revised chart. I have highlighted differences over 10%. I