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Title: help identifying a q-bits brand amplifier Post by: ssbothwell KJ6RSG on March 30, 2013, 03:02:53 PM i picked up a Q-Bit brand rf amplifier for $5 today at the swapmeet. the model number is QB-7183. i'm having trouble finding this particular model online. does anyone know the specs or have an old Q-Bit catalog pdf?
Title: Re: help identifying a q-bits brand amplifier Post by: KM1H on March 30, 2013, 04:20:41 PM Cant help with the specs but you can apply 15V, a low level RF input, a 50 Ohm resistor across the output (maybe a pad first) and a suitable scope across it.
Then start sweeping from 100 MHz up looking for output. Keep an eye on the PS current in case a device inside is shorted. Suitable lower end sweepers are fairly common these days or an old HP-8620C with a proper plug-in. Carl Title: Re: help identifying a q-bits brand amplifier Post by: ssbothwell KJ6RSG on March 31, 2013, 05:32:34 PM thanks carl. unfortunately i dont have a VHF/UHF signal generator and my scope only goes to 100mhz. i was just curious what bands this amp is useful on but i guess it will remain a mystery for the time being.
Title: Re: help identifying a q-bits brand amplifier Post by: Pete, WA2CWA on March 31, 2013, 08:47:33 PM Why don't you try and contact the Company that owns them now and see if they have any information. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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