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[Paulo Tibúrcio Pereira]

My Harris 23 GHz microwave transceiver also came from scrap. But only have the outdoor unit (ODU). Actually I need of the 23 GHz signal with 17 dBm to study RF propagation models. My question is: How to activate the RF signal from the RF unit (ODU) without using the multiplexing unit (IDU)? Thank you.

 

[davenn]

My Harris 23 GHz microwave transceiver also came from scrap. But only have the outdoor unit (ODU). Actually I need of the 23 GHz signal with 17 dBm to study RF propagation models. My question is: How to activate the RF signal from the RF unit (ODU) without using the multiplexing unit (IDU)? Thank you.

these are quite a complex system. Figuring out how to drive the PLL and VCO as a separate section is not something I have got around to trying
you will also see from that first circuit I provided that there are a number of multiplier stages between the VCO and the final output amplifier

All I can do is wish you good luck in your experiments


My best suggestion would be to search around for 23GHz Gunn Osc units as there are in the
Microwave Radio Corp gear that was shown in the other diagrams
I had put those into use building both FM voice and FM TV transmitter and receivers
They are very easy to get running.


Dave

 

[Paulo Tibúrcio Pereira]

Perhaps, if I apply a signal at the entrance of ODU it can function as converter/amplifier without the IDU. Please could you tell me the frequency and level of the link signal between IDU and ODU?

 

[davenn]

70MHz is the common baseband freq used on many systems
if it is what is used on this system, I don't know ?


Dave

 

[Paulo Tibúrcio Pereira]

OK. I watched the value of 70 MHz on your block diagram. But I did not know that BB in/out is the IF link. Please could you measure for me the level of the BB in/out on your transceiver in operation?

 

[davenn]

OK. I watched the value of 70 MHz on your block diagram. But I did not know that BB in/out is the IF link. Please could you measure for me the level of the BB in/out on your transceiver in operation?

That block diagram, is as stated in the pic, for the Microwave Radio Corp unit, not the Harris unit

The Harris unit is not in operation, so I cannot do any measurements
As I said in my previous post, I don't know if the Harris system uses 70MHz or not

 

[Paulo Tibúrcio Pereira]

OK. Thank you!
I'll do some tests after you notice.