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I agree the I2C would be a lot slower. You are better off using the ADC inputs directly and let it "free-run" (I use ADC6 and ADC7). That way when you need to access the data, it's just a quick check

You still need an antenna tuner. The SWR meter is kind of useless without one. I'm want to be able to operate for at least 48-72 hours. I'm figuring you need at least a 36-50 amp-hour battery to be

The spec sheet on this says it's a 4-pole, 25khz filter. I assume it is better than the 2-pole? tim ab0wr "Ashhar Farhan" <farhanbox@...> wrote:

Hi Jerry: Most of my comments are stylistic and your code should work just fine. As to the post-decrement operator, I was more arguing for having it as a separate statement as there are numerous

Allison, I am not an expert on digital anything, scopes or spectrum analyzers. Thanks for the information. Someday I need to find time to study up on all this but then I also need time to get the

I am working on a mod (tapping the antenna to share with an SDR (Not the IF, the actual antenna). I am looking at tapping the output of K3 so as to switch it out on transmit. Looking at the schematic

We must use different libraries. I send out the start conversion word to the part address… and away it goes. Then sometime later, I poll to see if conversion is ready/ do a read at the same time

Oh yes, over a narrow frequency range, of course! You just need to design the circuit around the motor switch to compensate for the high input capacitance and it works perfectly… Dr. William J.

Anyone else on? Just S6 noise here so far! -- John - WA2FZW

IF the filters are not matched to 50 ohm the insertion loss due to mismatch is very high as well never minding the?bandpass distortion.? That means the network on the board has to be part of the

You said That's not correct, unless you add some code to handle i2c transmit and receive in interrupt routines.? That's some code most of us would prefer to avoid. We currently do blocking IO on I2C

Thanks, That's exactly what I needed. Jim

Ok Jack, I will concede that whitespace around the "==" would have been a good idea. And that the extra indent is an error. A work in progress, I did state it was "unproven". Guess I lose a grade

We must not speak too low about using the IRF510 as a cheap PA transistor, after a bit of tweaking output looks just fine! Even Uniden are now using IRF520's in their 27Mhz CB rigs:

If you are operating Class C (for CW), 10mA is probably fine. For Class AB (linear SSB) you need the higher current. and everything gets much hotter.....heatsinks, etc. Re. the Ferrites, for the

Jim, HF Signals buys them from a compnay called WTL Crystals, based in China. There are several sellers on ebay on aliexpress. Most of them are the same 2 pole filter that we use. I found one just now

(Actually, it's the post-decrement operator, not the decrement operator.) I wasn't saying I don't know what the post-decrement operator does, I was just asking why make the code harder to read by

In the C language, the "--" operator is "decrement". So in this case, the instruction is indicating that d should be decremented by 1, then compared to r. If the decremented value of d is equal to r,

No, I understand what the code does. My question is why write it in such a confusing way. As my subsequent post states, there's nothing to be gained from this way of writing the code, other than

“Actually, reading values from an A/D over the I2C bus will take more time than just reading from the Nano's embedded ADC. “ Yes, but in this case, taking more time is ok… because the Arduino