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Thanks, Mike. I was basing the 7v. on the old datasheet and p.1 of the SM datasheet. I suspected 8v was right, but had no direction, even though I have built MAR3 amplifiers before. I don't have any

I'm pretty sure that you're the first person to uncover the Manhattan Skyline trace I embedded in the code, as seen in the first photo. Do you happen to recall the code change that "Tim" did. I don't

If you look at page three of the Mini Circuits data sheet for the MAR-3SM you will see a table listing values of series resistor for biasing the device with Vcc voltages up to 15 volts. Mike K5ESS

When I got mine finished I had the same issues. It's a power hog on the 9v batteries. The external supply is pretty clean but just in case I added one of those ChiCom DC-DC voltage regulators that are

PDP before CPM/4004/8080 was around, front panel IPL to boot the paper tape reader, memory and diagnosis tests using machine code since you can't run code on a broken machine.. Now I play with a PI

Sorry. The notations are "8V(TP2)" and "5V(TP1)". In any event, both TP1 and TP2 are 8.23v on my board. john AD5YE

Jack -- On the "TFT LCD VFO (Rev-2)" schematic, U3 is listed as a 78L08. It feeds R1 (82 ohm) and L1 (100 uH), and then connects to the MAR-3SM+. According to the data sheets I have seen, the MAR3

Is there enough volume with just the Arduino D6 driving the speaker?

hello friends, R46 is ok, and mic has plenty of output ( I think its even close to 1Vpp or thereabouts) - i am using a radioshack dynamic mic which I added a preamp. If I use the stock mic i only

'pre-script' to the above: I'm pretty much deaf, and have to use headphones to avoid deafening the rest of the household (or whatever environment), ... :)

Hi Dexter, Even with the Pin 3 mod, and also when I added the second 2N2222 to include the Pin 1 mod with it, I was having pops that were getting quite painful for a "non-deaf" person (hihi).

Log in to Yahoo Groups and search for “SoftwareControlledHamRadio” all one word – no spaces. You need to join Yahoo Groups if you haven’t. Mike K5ESS Sent: Saturday, August 19, 2017

Hi Jonathan. I'm pretty much deaf, but even then I've not needed full volume. Raj's improvements to quality could even lessen the need. Given that, I've not needed any more than the pin3 mod - and

Can't find the "SoftwareControl" group, Jack. [Where at, man, where at man, de-focus?] The aa project looks interesting ... 73

Raj, you're a gem! :) D18 and R111 were on my list, just hadn't got 'a round tuit'! Not at home at present, but will be doing the R112,114? mod - should be vastly better! Those with the 'super-cap'

I completed the AA a few months ago, and it has been working perfectly. I found that it really likes clean power, and plenty of it. A regular 9v battery would work for a few scans ?then the unit

That would do it. Jack, W8TEE To: [email protected] Sent: Saturday, August 19, 2017 2:06 PM Subject: Re: [BITX20] Antenna Analyzer problems. Hi Roy, I saw very high SWR where I didnt expect

Dumb question, but have you tried using a different electret mic element ? I had initial low output problems with my Bitx40 using a cheap computer headset with an electret mic element. I switched to

Everyone, I have come up with a modification to Gian's circuit that makes the pop/click completely tolerable with headphones at full volume. Please see the attached modified schematic and report back

Hi Roy, I saw very high SWR where I didnt expect one like the original poster. Then in looking at the schematic again of the analyzer I suddenly realized what was happening ! I was uploading the code