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JUMA TRX2-VM Voice Memory - Troubleshooting

I managed to get the crucial chip and build two units of the voice memory option and the external keyboard. Both units seemed to work (they recorded my speech/RX audio and played it back) and I celebrated... ...until I found out that nothing is broadcasted to RF even the recording is clearly audible...
by OH2CBD
07 Mar 2023 11:00
 
Forum: Juma Discussion
Topic: JUMA TRX2-VM Voice Memory - Troubleshooting
Replies: 0
Views: 12251

Reliable source for dsPIC30F6014A-30 I/PF?

Dear all

Has anyone found a reliable source to purchase these microcontrollers? It's absolutely out of stock on major retailers. I managed to get one from fellow ham but I would need another so I could build a lovely TRX-2 for my family member too.

BR,
Joel OH2CBD
by OH2CBD
19 Jan 2022 10:59
 
Forum: Juma Discussion
Topic: Reliable source for dsPIC30F6014A-30 I/PF?
Replies: 0
Views: 11793

Re: T1 on JUMA TX-1

I have also replaced T2 with Kemet 542CT. I hope it's suitable replacement.
by OH2CBD
12 Jul 2021 15:22
 
Forum: Juma Discussion
Topic: T1 on JUMA TX-1
Replies: 1
Views: 10368

T1 on JUMA TX-1

Dear other hams I was wondering if it's possible to substitute T1 on TX-1 with something self made? On RX-1 this TDK transformer has been substituted with this: http://www.jumaradio.com/juma-rx1/bifilar-transformer-en.html I did similar also for TX-1, BN43-2402 with four turns of bifilar coil. I was...
by OH2CBD
12 Jul 2021 15:01
 
Forum: Juma Discussion
Topic: T1 on JUMA TX-1
Replies: 1
Views: 10368

Re: HEF74HC4052 (related to RX1)

Replying to myself in case somebody else is wondering this. HEF4052BT by Nexperia was working properly in my build.
by OH2CBD
15 May 2021 20:40
 
Forum: Juma Discussion
Topic: HEF74HC4052 (related to RX1)
Replies: 2
Views: 11819

HEF74HC4052 (related to RX1)

Dear fellow hams I’m having troubles finding suitable part for D1 on RX board. It seems to have quite specific requirements (has to be Philips). I was able to purchase Philips branded but it has label ”PC74HC4052T” so no HEF available. I also got Nexperia ”HEF4052BT”. Would any of these work on RX1?
by OH2CBD
21 Apr 2021 07:29
 
Forum: Juma Discussion
Topic: HEF74HC4052 (related to RX1)
Replies: 2
Views: 11819

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