Greetings?
if anybody has a schematic of the RX board on vrm 5090
i need the value of resistor R80 mines black!

wd8axa

开云体育

Folks, I’mlooking for a Jag-V rear 10 way Dogbone radio to amplifier cable. The cable for the older Mk1 “vertical” sets as opposed to the later horizontal ones.
Any help really appreciated.?Best, D.

Hello,
I was looking at charging the MA948 battery for my TRA 921 through the audio connector.
Before I did so, I noticed the wiring on the bottom of the case does not appear to be complete.
Looking at the radio upside down and the battery connections on the right there are three screws.
The nearest screw (which is attached to a black wire inside the case running to the PCB connector) has two tabs.? One tab has a spare fuse pushed into a loop, the second tab has a blue wire running to a metal disc attached to the bottom of the case and to the left of the battery connectors.
The middle screw has a tab with a blue wire attached that runs to the side of a fuse holder attached under the third screw.? There is a blue wire running from the base of this fuse housing to a tab under the third screw (the screw holding the fuse holder).? On this middle tab there is also a blue wire that runs back under the fuse holder but it has been cut so it is at the end of the fuse holder.? Inside the case, there is a red wire running from the middle screw to the PCB connector.
There is a second metal disc to the left of the battery connectors and about 3" away from the first metal disc.? There is also a blue wire soldered to this disc, but it is also cut about 1/2" away from the disc.
So, what should the two cut wires be attached to??
The only documentation I have is the Technical Manual which does not appear to have a wiring diagram for what I have described above.
Any assistance would be greatly appreciated.
Ian

Good morning all.

I got my hands on a CODAN 8528 radio and some accessories.

Unfortunately, the 15-pin plug of the CODAN 9366HF SSB TRANCEIVER remote control is torn off.

I do not find on the canvas the wiring of it.

Is one of the members of this forum likely to enlighten me or give me a lead.

Thanks in advance.

Warmly.

Fred.

Syncal-30 is a complex set so you cannot expect a simple answer like "it's C23". You must get the circuit printed out with the parts locator diagram and work through it. Start with PSU voltages.

You must analyse faults in detail. Is your "1Mhz" out meaning 1.0000MHz out and is that for any dialed fq, or what?
You need to get your analyser or fq counter to look at the synth output and the reference output to check they are right. I have seen IC faults with the 74LS versions causing the synthesiser to make a digital error in selecting the frequency. I presume it is not beeping to indicate "out of lock".

The big relay is the one everyone looks at but there are many more - which look like ICs. Check them all.
A common reason for a relay not engaging is that a transistor is faulty. I have fixed many Syncals with strange faults with the transistors that are effectively doing simple logic functions relating to RX/TX and CW keying etc. They seem to go very low hfe or just leak badly, making the voltages incorrect. So always check the relay drive before changing a relay.

I have to say that yours does look like it may have been exposed to a lot of moisture - not a good sign. The "X" model has no good reason to get its boards corroded. The "P" model has a good reason - the internal battery leaking.

George M0GXB