| Home |
| Search |
| Today's Posts |
|
|
|
#1
January 25th 06, 04:06 AM
posted to rec.radio.amateur.homebrew
|
|||
|
|||
WWV receiver
|
|
#2
January 25th 06, 05:31 AM
posted to rec.radio.amateur.homebrew
|
|||
|
|||
|
WWV receiver
Tobin Fricke wrote:
On Tue, 24 Jan 2006, wrote: The trick with regens is to couple as loosely as possible. There is enough gain in most regens that even a very loose coupling is enough to overlaod and flatten out the selectivity. Could you recommend a good introduction to the theory of the regenerative receiver (and superregen)? thanks, Tobin I'll recommend a little book that is readily available. "Secrets of Homebuilt Regenerative Receivers" by C.F. "Rock" Rockey. Its a Lindsay Publications book. Rockey does a good job at simplifying the simple  Basically theconcept of a regen is feeding the output back into the input for reamplification. Theoretically its a somewhat infinite process in that the reamplification continues repeating itself resulting in very high gain at the particular frequency the set is tuned to and thats also where the selectivity improvement comes from. Its similar to oscillation in a tube. The coupling issue mentioned by Allison is related in the sense that heavy antenna loading will decrease the circuit Q and consequently decrease its selectivity as the regenerative signal makes its round-trip thru the circuit. That opens the window for strong stations that are well off frequency to easily overload the circuit as a whole due to the high magnitude of amplification. You'll see some circuits with direct antenna connections to the tank circuit (bad)...some use a separate antenna winding on the coil (better) some use capacitive coupling to the tank...some use a combination of both. Easy enough to build one for grins...might not be as stable as you would want for your decoding project but would be a good, fun exercise just the same. GL, Bill |
|
#3
January 25th 06, 11:22 AM
posted to rec.radio.amateur.homebrew
|
|||
|
|||
|
WWV receiver
On Tue, 24 Jan 2006 20:06:22 -0800, Tobin Fricke
wrote: On Tue, 24 Jan 2006, wrote: The trick with regens is to couple as loosely as possible. There is enough gain in most regens that even a very loose coupling is enough to overlaod and flatten out the selectivity. Could you recommend a good introduction to the theory of the regenerative receiver (and superregen)? thanks, Tobin You may want to consider this little regen receiver project. The board for it is available from Far Circuits for around $5, or you could make your own board. http://www.electronics-tutorials.com...o-receiver.htm Mike |
|
#4
January 25th 06, 12:19 PM
posted to rec.radio.amateur.homebrew
|
|||
|
|||
|
WWV receiver
On Tue, 24 Jan 2006 20:06:22 -0800, Tobin Fricke
wrote: On Tue, 24 Jan 2006, wrote: The trick with regens is to couple as loosely as possible. There is enough gain in most regens that even a very loose coupling is enough to overlaod and flatten out the selectivity. Could you recommend a good introduction to the theory of the regenerative receiver (and superregen)? thanks, Tobin I Don't have any but I'd look on the net as there are gobs of circuits with explanation. However the best explaied ones may be the older tube designs. Allison |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| How to measure soil constants at HF | Antenna | |||
| FS: HBR-15 Receiver, Hallicrafters, Heathkit, Millen and Other Goodies | Boatanchors | |||
| More Receiver Reviews and Info including 'other' People's WebPages | Shortwave | |||
| FA - R. L. Drake SW8 'portable' World Band Shortwave Communications Receiver | Shortwave | |||
| a page of motorola 2way 2 way portable and mobile radio history | Policy | |||
Hybrid Mode
