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Re: DDS/Front panel voltage table

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 ...
by NQ3RP
04 Feb 2019 23:03
 
Forum: Juma Discussion
Topic: DDS/Front panel voltage table
Replies: 1
Views: 701

DDS/Front panel voltage table

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 ...
by NQ3RP
24 Jan 2019 13:35
 
Forum: Juma Discussion
Topic: DDS/Front panel voltage table
Replies: 1
Views: 701

Re: Nothing to buy in Juma e-shop

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...
by NQ3RP
24 Nov 2018 01:12
 
Forum: Juma Discussion
Topic: Nothing to buy in Juma e-shop
Replies: 6
Views: 2528

Re: Nothing to buy in Juma e-shop

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...
by NQ3RP
15 Nov 2018 22:59
 
Forum: Juma Discussion
Topic: Nothing to buy in Juma e-shop
Replies: 6
Views: 2528

Re: Lower output from 10W

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...
by NQ3RP
12 Oct 2018 11:28
 
Forum: Juma Discussion
Topic: Lower output from 10W
Replies: 3
Views: 988

Re: Lower output from 10W

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...
by NQ3RP
10 Oct 2018 23:31
 
Forum: Juma Discussion
Topic: Lower output from 10W
Replies: 3
Views: 988

Lower output from 10W

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
by NQ3RP
10 Oct 2018 14:16
 
Forum: Juma Discussion
Topic: Lower output from 10W
Replies: 3
Views: 988

Re: Juma Kits (general)

ED -
What did he charge for the uProcessor ?
John
NQ3RP
by NQ3RP
24 Sep 2018 21:33
 
Forum: Juma Discussion
Topic: Juma Kits (general)
Replies: 2
Views: 1103

Re: Juma TRX2A and DSP

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...
by NQ3RP
16 Dec 2017 12:54
 
Forum: Juma Discussion
Topic: Juma TRX2A and DSP
Replies: 5
Views: 1557

Re: Juma TRX2A and DSP

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...
by NQ3RP
15 Dec 2017 14:16
 
Forum: Juma Discussion
Topic: Juma TRX2A and DSP
Replies: 5
Views: 1557
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