MFJ Enterprises Original MFJ-916B 1.8-225, 350-540 MHz Duplexer - SO-239

Worked exactly as it should. The description is a little vague but it is both a duplexer and a diplexer. I use it for a diplexer and it works great!

I think this is one product MFJ can rightly take pride in. It allows you to operate two radios (a 2 meter and 70 cm radio) on one shared antenna...or feed two antennas to one dual band radio. What is does not allow is repeater operation that requires both bands on a single radio. For example, if you set up your radio to call the repeater on the ISS which has an uplink frequency on the 2 meter band and a downlink frequency on the 70 CM band you can have one or the other, but not both, to the same radio. The workaround is to transmit on the 2 meter and receive on on the 70 CM with another radio.

useful to attach separate 2M/.7M radios to single attena - works well, little loss.

Works properly for both VHF and UHF bands. When antenna was measured with a SWR meter before this was installed, I had a 1.01 and 15watts on VHf and a 1.2 and 27watts on UHF with a multi-band Tram antenna. After installing this filter, SWR readings increased by .1 for. VHF and .08 on UHF and the watt output for both fell by 2%, which is exactly what I expected. This increase in SWR affected nothing since it was so small and the ratio was under 1.5. I can receive and transmit simultaneously on both bands. This device is a MUST if you are into ham/GMRS.

if you are using 2 hand helds or mobile units this will go great for your needs and for the money this is the best buy

Item is great

Im not sure what the insertion loss is, but I have this connecting APRS (VHF) and my DMR hotspot (UHF) to a single dual-band antenna. At 40mw from the hotspot, I can use my hotspot at over 3 miles away, so the loss must not be too terribly bad! APRS performing as well...

Worked exactly as advertised. Use it with a cross-band repeater.

Mfj tiene un problema con algunos equipos que luego de varias semanas empiezan a dar problemas con el swr

Makes the use of separate antennas in my shack easy. I havent found a noticeable change in swr with this in line.