JUMA Amateur Radio Forum

You have a serial port problem. First check with a multimeter that your serial port is giving the correct TX DATA voltage. Plug a stereo 3.5mm to 3.5mm patch cable into the PA-100D's RS-232 port, and with a multimeter, measure the output voltage on the TX DATA line, which is the ring connection, it ...

I hope my suggestions help, let me know. As for your frequency sense problem, that's a new one. When I modified the firmware - I am assuming that you are using my modified firmware - I spent a lot of time on the frequency sense logic as the original firmware had a tendency for 'relay chatter' at the ...

There are several possibilities for this fault to occur. Attached is a copy of the schematics associated with the over current sensing. I am assuming that this is not a real over-current situation, that in the standby state the amplifier is only actually drawing 500mA to 600mA when the alarm occurs ...

Hi, The enclosure for the PA100-D is a Hammond 1402B, Height = 2.40", Width = 7.10", Depth = 4.90" It can be obtained from, for example, mouser.com. As previously noted, the enclosure for the TRX2-A is a Hammond 1402D, Height = 2.40", Width = 7.10", Depth = 7.30". 73, Adrian, 5B4AIY

Hi, Bert,

Simple answer to a simple question, if the amplifier is in the standby state then the RF-in socket is directly connected to the RF-out socket, so yes, you can operate with more power straight through. Just be careful you do not accidentally switch to the operate state!

73, Adrian, 5B4AIY

Hi, David, If you are looking for some improved firmware then you might like to consider what I did for this transceiver. You will have to use the 16F88 processor which is pin compatible, because this new firmware uses virtually all the available memory to cram in all the features. I am attaching ...

Hi Daniel, I use a boom microphone headset. Several work nicely with the Jume TRX2, my particular favourite is the EPOS H3, but I have also used the Yamaha CM-500, the Audio-Technica ATH-PDG1a, and the Austrian Audio PG16. I much prefer to use a headset as the transceiver is somewhat microphonic and ...

HI, The amplifier is currently marketed by RoWaves in Romania, (www.rowaves.com) and is equipped with my firmware modifications. The amplifier has several modes of automatic band selection, Frequency Sense, whereby with about 100mW of CW input power the amplifier will automatically select the ...

Yes, and looking at the display, they are using my firmware as well, cheeky beggars! OK, so my firmware is in the public domain, but still .....

Adrian, 5B4AIY

Good Morning, Hans, Your microphone has four leads, which in fact are two screened leads. With a multi-meter identify the PTT switch lead and its screen. The data sheet does not seem to contain a schematic of the microphone, but you should be able to identify the PTT switch, as it will show a short ...