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Rezensionen (4)
27. Jan 2021
Nice units
Got 3 of them for 2M and 1296 amps.
Very lightly used, measured -41.8dB with ~0.1 IL at 144Mhz so useful for 2M amp.
06. Nov 2019
Works well, but test it.
These work pretty good. I have 2 of them. The first unit I lost ports 1 to 3, I am sure due to static, connecting coax many times during testing on a silicone soldering mat, my fault, my cable was not long enough to reach another foot to the ESD mat. So be careful.
I ordered a 2nd unit for a replacement. I had problems with it at first, most of the ports showed similar power output as the selected port (little isolation). Verified the ports were switching properly, examined the board under magnification for shorts, looked good. I reheated all the joints on the SMT as well as the input connectors and caps, problem solved.
02. Okt 2019
Works well for measuring output of programmable LO chain
Note the accuracy is best over -5 to -55dBm and the error grows significantly either end of those numbers. See the AD8318 data sheet. Still usable in the 0 to -5 range.
I connected the detector to a spare RF SP6T Switch port via a 30dB attenuator to measure the output of a 6GHz programmable LO for my VHF+ transverters.
The PLL output at +2dBm drives a 31dB programmable attenuator, a +20dB amp, then goes through a SP6T RF switch for a typical output range of +22dBm to -9dBm over the range of 50MHz to 3400MHz, then due to my RF switch rating ouput falls off so that 5760 is down to -24dBm. The 30dBm fixed SMA attenuator puts the LO output range into the sweet spot of the AD8318 at -8dBm to -39dBm range for good accuracy through 6GHz. I correct the display for the offset.
I display power measurement real time while adjusting the attenuation or frequency of the LO for each transverter, very handy. Tempted to use a second one and connect them to a bidirectional coupler for a custom RF power meter and SWR meter.