I would like to combine signals from 2 antenna's, 800 mhz and 160 mhz into one string of lmr400 coax.
How can I do this with minimum signal loss.
How can I do this with minimum signal loss.
Combining 800mhz and 160mhz in same coax
- Thread starter cmatthews
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Ubbe
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Use a diplexer and you'll have practically zero loss. Here's a $20 one that have a crossover frequency of 250MHz so that everything above 350MHz and below 180MHz are mixed together in one coax, or one coax split into two with different frequency bands, as it isn't directional.
Remember that frequencies between 180MHz-310MHz will not work to receive thru the diplexer and you will also need pigtails or adaptors to match the diplexers SMA connectors to the coaxes.
You can search for a source of diplexers in US if the shipping from europe are too high, but then the total will anyhow probably be much more as I haven't seen any US ones that doesn't cost ten times more.
/Ubbe
Remember that frequencies between 180MHz-310MHz will not work to receive thru the diplexer and you will also need pigtails or adaptors to match the diplexers SMA connectors to the coaxes.
You can search for a source of diplexers in US if the shipping from europe are too high, but then the total will anyhow probably be much more as I haven't seen any US ones that doesn't cost ten times more.
/Ubbe
I didn't see a link to what you indicated, "here is one".
/Clarence
/Clarence
This will be used for Reception only.
/Clarence
/Clarence
Ubbe
Member
The link dissapeared on me? Here it is: Diplexer 2m 70cm for Ham Radio Transceiver SDR receiver | eBay
I use one myself and measured it and it has no loss.
/Ubbe
I use one myself and measured it and it has no loss.
/Ubbe
Ubbe
Member
Yes. It is capacitors in series with the signal and chokes to ground and stray capacitance should only start to have an impact at several GHz. I can sweep and measure the filter up to 1.3GHz and there where no issues up to that frequency.
It's a standard type of combined lowpass - highpass filter that you can build yourself for $5 if you can get the components and something to attach them to and then add connectors and.... Well, $20 seems reasonable enough to have it done for you.
/Ubbe
It's a standard type of combined lowpass - highpass filter that you can build yourself for $5 if you can get the components and something to attach them to and then add connectors and.... Well, $20 seems reasonable enough to have it done for you.
/Ubbe
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