Title: UTC 64874 Post by: Opcom on March 08, 2017, 07:31:59 PM Anyone got data on the UTC 54874? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I think it a BC band reject filter /HPF after briefest checking. My data is pretty poor, so any help would be appreciated. The unit is a rectangular tall box, black, with 4 solder terminals in a fiberboard insulating plate on the bottom. About 6" tall, 2.5-3" wide and 3.5-4" deep. It's weighgty but it is apparently potted with some hard waxy material. Tag says: UTC 54874 UTC BR 54874 - but someone has 'engraved' the BR, not at the factory probably. Zin and Zout unknown but when connected to a sweep of 10KHz-3MHz and input fed by a 50 Ohm leveled source at 1V, and output loaded with 200 Ohms, and output observed on scope. the points were noted: reference to output at 3Mhz: 3MHz 0dBm 2MHz 0dBm 800KHz -3dBm (about 0.7x the 3MHz voltage) 320KHz -6dBm (half the 3MHz voltage) The curve was smooth and looked like typical HPF, but I think it ought be sharper. Maybe with the right load impedance it will be better. At the moment all generators going above 3MHz are out of order. I say dBm because I am referring to power, that is 1/2 the voltage across the 200R load is -6dBm Not sure if that's the right notation as receivers often specify microvolts. I'd like to put it to use if I knew exactly what it is and how to use it properly. 8-) |