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Neither HF amateur is expected to transmit Hi-Fi. I suppose, if managed, it should suite well. Only issue is biassing needed for the mic. You need to flow 10mA into the mic.ll the best for a trial. A

Thanks for the comments. I know (wikipedia hihi) the limitations of carbon types, but I remember old telephones were not hifi but very effective in speech. The carbon type needs dc and maybe the one

Not earpiece but mouthpiece. https://en.wikipedia.org/wiki/Carbon_microphone [email protected]> wrote:

Another quirky alternative: Piezo! Trying to 'mic up' a guitar for stage performance (an Epiphone "Texan', professional-quailty!), I tried a 'Shadow' contact transducer. It failed on fitting, giving a

Thanks to all of you for your input...Regards Jes M0JSW

Did some more tests, built an RF probe for my DMM, did the maths to come up with the following outputs in watts at about 13volts. 3.5 7 10 14 18 21 24 28 CW 0.9 0.6 2.8 2.2 1.3 2.6 1.0 0.6 SSB 3.6 3.9

THIS is what I planned to do bu the provided diode is only rated at one amp. I wanted then to put a 5A diode in series with the positive line but didn't have one on hand. I also agree that the .7V is

Forgot what thread I was using for this but it looks like Milt Cram, W8NUE, has adequately tested the design and Milt? came up with an excellent "slope intercept and gain" calibration procedure which

2.5 should work, but I am running 3A for just a little margin. Woody

It Lives !! Did many of the board mods, added RX amp/attn/agc, changed/added RX audio chain, added F/R power meter & S meter, VOX, sound card interface, and fan. TX power is still about 6db down from

If you put a 3-5 amp rectifier in series with the positive lead you will not blow fuses or damage any parts due to reverse polarity. The .7 volt drop will not be noticeable to you or on the receiving

Hi, A fuse may or may not prevent damage to the gear that is downstream - your rig. It is likely to limit damage but something has typically already failed to blow the fuse. Progressive damage will

Jes The reason to have a fuse is to limit damage from an over current condition. I sense the fuse does not have to be too close to the nominal operating current, and possibly there can be some

Apologies if this has been asked a hundred times already, but what is the ideal rating for the reverse polarity fuse on a ubitx. I think I read somewhere that 2.5 amps is probably the ideal rating,

Thank you Jack... one has to know where to look! Sometimes there is just Toooo much. Thanks... will try it. Jeff ve3coj

Try the earpiece from an old cradle type telephone. The carbon mic element is not advisable since it has an inherent hiss that may have to be filtered out. The earpiece has a diode-looking device

@David, you can post your design in https://www.thingiverse.com?There are some uBitx posting there already. You can just add STL file or also include design files as well.

If you look at: phdlee/ubitx | | | | | | | | | | | phdlee/ubitx ubitx - sketch for the raduino to work with the ubitx transceiver - phdlee/ubitx | | | you can see the header file listed there.

Hi Jack... Well no luck finding a ubitx.h header in any Sketches I could find... Anyway, I reverted to uploading Hex files and the transceiver is up and running first upload!. Thanks for your help and

Jeff, ? ?If you desire to work through the process of understanding the Arduino IDE, library management, and the way different IDEs behave, please let us know which version of the IDE you're using,