| Home |
| Search |
| Today's Posts |
|
#11
October 29th 06, 01:31 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
Timewave ANC-4 question!
Jan Simons PA0SIM wrote:
"Sun Tzu" schreef in bericht news:ruCdnermL6SEDd_YnZ2dnUVZ_uydnZ2d@hawaiiantel. net... Jan Simons PA0SIM wrote: "Sun Tzu" schreef in bericht ... Jan Simons PA0SIM wrote: Reading the schematics it is possible that the ANC-4 does not fully cover the 360 degrees phase shift, just like the MFJ-1025. But it is also possible that you experience more than one noise source on 75 mtrs. A noise canceller (with two inputs/antennas) can cancel only one noise source. I have written about noise cancelling on my site, e.g.: http://www.pa0sim.nl/Phaser%2080%20-%2010%20meters.htm May be it can help. 73 es gl de Jan PA0SIM Nice website, have you considered modifying the existing units (MFJ & ANC) to do what you have shown? Your idea would make either of these 2 units much better. By the way, I took the sense antenna which is a short dipole and I made one leg vertical and the other horizontal. Now I have almost no noise on 75 meters. I haqve been playing around with this for awhile and it was either all vertical or all horizontal. Now with this configuration the weak signals can be heard. Stan AH6JR Hi Stan, I have considered it, but sometimes it is easier and better to start fresh. First question is always: what phaser/noise canceller do you really want? What do you expect from it? Looking at the design of the MFJ-1025, it would take to much mods to realize my needs. When one of the antennas doesnt hear the noise source, you dont need a phaser. But of course that antenna still has to hear your wanted signals. Using a small loop antenna it is sometimes possible to null the noise source. I think playing with a short dipole, as you did, is the same as nulling with small loops. 73 de Jan PA0SIM I have the ANC-4 which works well. This new sense antenna is really good, as I can hear signals down to S-2 on 75 meters. I guess if I had to do it I would prefer to modify the ANC-4 as its a quality unit, not perfect but it is built well. If you would have any ideas as to modifying the ANC-4 I would'nt mind working with you on this project. But I will leave that one up to you. Hopefully I will be able to hear you in the contest this weekend on 75 meters! Good Luck in the contest my friend! Sri, I prefer my Digital Signal Processing route with the two Elecraft K2 receivers. DSP makes an ideal phaser. So no need here for a "better" analog one. And DSP gives me a lot more tricks to reduce interference and noise. 73 es gl de Jan PA0SIM May I ask what the tricks are? |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Question about the Timewave ANC-4 | Shortwave | |||
| New odd question | Antenna | |||
| For Sale TimeWave DSP-59+ DSP unit | Scanner | |||
| Stupid question G5RV | Antenna | |||
| transmitter question - its a dousy | Homebrew | |||
Threaded Mode
