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No one is going to want to hear this but the design of the PA output filter is probably fatally flawed and it is likely due to board layout issues. I have been puzzled how the high order harmonics of

Check my website, www.w0eb.com ( http://www.w0eb.com ) for details, but I now have a completely drop-in Raduino clone available in kit form for anyone needing a replacement for a damaged Raduino that

Hi! Has anyone one tried MEMS microphone like these.. https://www.adafruit.com/product/2716 Replacement elements for mobile phones are available quite cheap. Some variants come with in built

Hi all. I don't know how to suppres great carrier in TX mode.

Allison, Here paralleling of cap arose? due to sheer unavailability of good quality caps in pF range in local mkt. I wanted to optimise the filters to best possible extent on local components so that

Hi Eddie, wiring for 4 pin : pin 1. Mic input, pin2 PTT,pin3 is put ground and pin 4 is mic ground. So link 3and 4 to earth and pin one is mic and pin 2 is ptt makes sense to keep connections short

Hi Allison, these 1:49 transformers are just conventional transformers. Would you think that a 1:4 and a 1:9 current (not the voltage ones) transmission line transformers in series to get a ratio 1:36

Again, thanks for the explanation.? After adding the air choke and counterpoise (17.5ft -- I'll trim it back tomorrow), *the uBITX now behaves properly when keying the mic and transmitting CW!!!* The

No it wasn't. Arv just created the antenna group today. The loop group you're talking about is different. Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/

formerly it was https://groups.yahoo.com/neo/groups/loopantennas/info Regards MVS Sarma vu3zmv

antennas /g/antennas Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

Yahoo group "loop antennas" moved here /g/loopantennas Regards MVS Sarma

If one has working MICs meant for other rigs that he uses, we can by a similar connector and wire accordingly . It helps sharing the same mic for ubitx. regards sarma vu3zmv

What is the exact name of the new antennas group that has been mentioned here? Al, KB4RA

There really is no "standard" for wiring mic connectors. Each brand seems to have their own scheme. Unless you are trying to match a mic from an existing radio, just wire it so it makes sense to you.

Al Peter, AC8GY, who has a lot more assembly skill than I do, made this mic for me using the stock element and switch: The case is one of those promo pens that had a small LED and battery in it. It

First SMD project? OK, then note: to remove a resistor, heat both ends (blob the whole item!) and swipe away from pads to open area (works for smd caps, diodes, transistors too, so long as you don't

Rahul, Parallel caps also offer lower ESR best is the values are near the same but it helps. The biggest is crystals ground for series resonance vs parallel.? IT seems to get me a lower ESR and Lm.

I have not found one. However: Antennas? on groups IO is officially open. Allison

Pot, definitely - Rich WB2GXM