I sketched up these plans the other night, for a 33cm setup I might make in the future.
Can someone tell me if this will work?
The transmitter frequencies are 125 KHz apart.
My concern is this: the transmitters are really transcievers, except the recieve section isn't being used. But the reciever is still connected to the antenna port via the antenna switching circuit. I assume the InterModualtion panel [isolator, dummy loads] will prevent any RF from the other two transmitters from hitting the reciever, and burning it out? I'd rather be safe then sorry.
A big thank you in advance!
Will this work?
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Will this work?
73 DE KC8RYW
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
Your receive side set up looks fine.
Combining transmitters at 125 KHz spacing at 900 MHz is a problem. Traditional cavity-ferrite combiners like to have 500 K or better spacing. At close spacing the industry uses what is called a hybrid combiner. An example of a suitable hybrid coupler would be a DB4376.
It is possible that your transmitter combining concept may work but I suspect the cable lengths may be critical. If you have access to a VNA you could always set it up and see if it looks like it will work.
Combining transmitters at 125 KHz spacing at 900 MHz is a problem. Traditional cavity-ferrite combiners like to have 500 K or better spacing. At close spacing the industry uses what is called a hybrid combiner. An example of a suitable hybrid coupler would be a DB4376.
It is possible that your transmitter combining concept may work but I suspect the cable lengths may be critical. If you have access to a VNA you could always set it up and see if it looks like it will work.
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- Posts: 1747
- Joined: Fri Dec 28, 2001 4:00 pm