JUMA Amateur Radio Forum

Just to document and keep everyone informed of my TRX2A build here's the update. I destroyed the first DDS by improper soldering of the dsPIC. The second I sent to a builder who did a beautiful job but by using improper grounding technique and improper voltage jumpers I destroyed that one. It would ...

Looking for help on my TRX2A problem. My radio turns on with a push of power button, long push does nothing. Will not turn off with power button. When it turns on I have no backlight and only blocks on first row of display very dim. I checked the voltages on the display pins -2 = 5V,15 = 12V and 16 ...

Juha, Matti and Kari - Are there any plans to offer newly designed kits or to restock and continue selling your offerings listed on the product page? I know it's been 10 - 15 years ago that you were actively designing and producing JUMA products but looking in Juha personal page, I see DDS receivers...

Petr, I too am hoping that the gentlemen who make up Juma will create new kits and continue to provide their excellent offerings to the radio enthusiast. Even though the rage in amateur radio seems to be SDR radios (K3, mcHF and others), I think there is still a place for a well designed non-SDR rad...

After lookin through the whole forum for an answer because the search form wouldn't search for it, I found the answer on how to lower the output from 10W on both CW & SSB. Thanks Adrian, ∞ 5B4AIY for his explanation from a few years ago. Posted here for an answer so others can reference: "T...

Ed, That's exactly what I don't want to do. I was hoping someone had modified the Tx RF Atn and Ist stage PA amp circuit to make changes to the output power. The unit already has 1db, 2db or 3 db attenuation for band balancing in the Tx RF Atn circuit. I'd like to add those and 6db + 9db as user pow...

I'm looking for an easy way to drop output power for QRPp and BPSK modes. Without going into the software drive setting is there an easy page or additional hardware ad on to make it easy ?

John
NQ3RP

ED -
What did he charge for the uProcessor ?
John
NQ3RP

Adrian - I will look at your firmware and thanks for the tips about the voice memory connection description. I've run into the problem with limited button / function problem in many hardware interface routines before. I see that each button is used in several ways but there is no combination of butt...

Adrian - I agree with the changes that would have to be made, also the A/D would have to be changed, etc. But I think it would be easy to do with another board containing an A/D, D/A and a STM processor doing the Fourier transform. Would need to changed the clock speed to 7.5Mhz in that case, the 16...