| Home |
| Search |
| Today's Posts |
|
|
|
#1
April 10th 07, 01:18 AM
posted to rec.radio.amateur.equipment
|
|||
|
|||
What does a Q Multiplier do?
"pltrgyst" wrote in message news  On 9 Apr 2007 18:53:01 GMT, (Michael Black) wrote: A Q-multiplier is a regenerative stage. It's prime was in the days of the 455KHz IF, where the improved selectivity would actually make a difference. At a higher frequency, it would still increase the selectivity of the tuned circuit, but not enough to narrow the passband for voice or CW. So what about audio Q-multipliers? Do they function on the same principle? -- Larry Yes. The idea of a Q-Multiplier is to increase selectivity. They use regeneration (positive feedback) to decrease the bandwidth of a tuned circuit. The frequency can be whatever is desired. Q-Multipliers were popular at a time when most receivers had inadequate selectivity. They are relatively cheap and, with some limitations, work pretty well. As receivers with more sophisticated filters (like mechanical filters or multi-pole crystal filters) became available the Q-multiplier fell out of use. BTW, the old regenerative receiver works on the same principle. In fact, one can see a Q-Multiplier as a sort of regenerative receiver working at the IF or audio frequencies. -- --- Richard Knoppow Los Angeles, CA, USA -- Posted via a free Usenet account from http://www.teranews.com |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Q-multiplier for Mosley CM-1 | Boatanchors | |||
| Q multiplier for SX-28 | Boatanchors | |||
| FA>> Heathkit QF-1 Q Multiplier | Swap | |||
| FA>> Heathkit QF-1 Q Multiplier | Swap | |||
| Q-Multiplier at RF stage? | Homebrew | |||
Hybrid Mode
