[Elecraft] Elecraft] Timewave DSP-599zx

David Cutter d.cutter at ntlworld.com
Sat Jan 3 02:47:50 EST 2015


Hi Jim

May I ask you about your system for mixing rx antennas? How do you arrange 
the double mixing? I have this in mind and I already have a 1026 and could 
buy a NCC-1. I have a selection of HF aerials going up which I can use for 
rx on 160, possibly even in diversity mode with the K3. We have neighbours 
all around with various noise sources.

Re the hash from your K3: do you have that mod fitted that puts a sharp cut 
off audio filter in the K3? I recall it was originally made for a weak 
artifact >12kHz some experienced way back. You said "high freq to 1,200 Hz," 
did you really mean that?

Sorry for the thread drift.

73

David
G3UNA


>I have the Timewave, the NCC-1, a MFJ-1026 noise canceller, beverages and 
>commercial mag loops, and my comments are:
>
> 1. I find the Timewave Noise reduction is of little value, the K3 NR is 
> superior
> 2. The Timewave has an EXCELLENT audio amplifier and completely removes 
> the "hash" from the K3 audio. I use Bose QC-15 earphones that reproduce 
> high frequencies very well.
> 3. The Timewave DSP filters have little ringing and are steep. I adjust 
> the low freq
> cutoff to 300 Hz and the high freq to 1,200 Hz. This TOTALLY eliminates 
> the "hash"from the K3 audio.
> 4. If you have an rf noise issue, the Timewave will not help any more than 
> what the K3 does.
> 5. The MFJ does work as advertised, but it is difficult to adjust. When 
> adjusted, it does give great nulls.
> 6. The NCC-1 also works as advertised, and is far easier to adjust.
> 7. The "noise antenna" is VERY important to the performance of any noise 
> canceller.
> 8. Loops are great to null a single noise source. It is inferior to a 
> directive (gain) antenna.
>
> I went totally overkill for my physical location in California, with two 
> PRO 1B loops and two phasers that can address two noise sources. I no 
> longer have the room for beverages, which were the best with a phaser for 
> 160-40 meters for my physical location
>
> Jim
> W6AIM 



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