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write your own review of the Timewave DSP-9+.
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K6SPY
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Rating: 5/5
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Jan 21, 2012 09:08
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Amazing difference!
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Time owned: 0 to 3 months
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Hooked up this unit to an old Icom 707 HF rig that has no filtering. Took out the majority of the annoying hash and interference.
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K2JF
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Rating: 5/5
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Feb 26, 2009 04:08
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what a joy!
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Time owned: 0 to 3 months
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I bought a Kenwood TS 930sat a few months ago that does not have built in DSP filtering but is the best cw rig I ever owned. But in NYC there is terrible band floor noise and the DSP 9+ does a better job than I expected in removing it almost entirely. Picked one up for $90 from a ham through QTH. In conjunction with the cw controls on the radio it makes listening so much more pleasurable.
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K4SPS
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Rating: 5/5
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Dec 28, 2007 00:44
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No more white noise!
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Time owned: 0 to 3 months
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I recently acquired, from E-bay, this Timewave DSP 9+ and I am extremely satisfied with its performance. Hooked to the audio output of my Drake TR4C and TR3 transceivers, they have both become a true joy to listen to. Believe it or not, the audio is now superior to all my modern 'digital' rigs. I'm only sorry that it took me so long to acquire this technology. $80 is what you can expect to pay. If you have old tube type receivers, this filter is the trick! Save your ears - get this accessory. 73 for 2008 K4SPS
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W2RDD
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Rating: 5/5
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Sep 20, 2007 04:15
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A Great Help!
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Time owned: more than 12 months
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I was fortunate in getting this filter as part of a used QRO transceiver purchase.
I must echo the other positive reviews of this Timewave model. I use it with my non-DSP FT-817ND and it definitely improves the readability of weaker QRP signals. Takes some getting used to and the instruction manual should be read. If your transceiver does not have DSP or is an older non-filtered boatanchor, this filter is highly desirable. If you are lucky enough to find one, jump on it.
Oh, the QRO rig referred to earlier was sold a year ago.
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K4RWW
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Rating: 5/5
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Sep 16, 2007 07:05
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Very good DSP
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Time owned: more than 12 months
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This DSP unit works well and is roughly comparable to DSP features found in current state of the art ham transceivers providing: 1) the firmware is upgraded to Timewave's latest 3.03A, 2) the Voice mode random noise reduction is set internally to the less aggressive option and 3) gain levels are adjusted per instructions. The operating manual is comprehensive and internal jumper settings are easy to accomplish. I get good CW/SSB results using mine with older and non-DSP receivers like the Collins 75S-3B and Palstar R30C.
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SCANDOGTWO
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Rating: 5/5
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Jan 9, 2007 17:42
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NICE DSP FILTER!!!
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Time owned: more than 12 months
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TIMEWAVE DSP-9+ INCREDIBLE FILTER.
CAN IMPROVE VIRTUALLY ANY TX OR RX.
IMPROVE YOUR RECEPCION AND PICK UP ANY LOW SIGNAL.
VERY RECOMMENDED FOR RADIOS WITHOUT DSP.
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WA4053SWL
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Rating: 5/5
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Jan 6, 2007 18:30
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Excellent DSP filter!
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Time owned: 3 to 6 months
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Buy one of these in e-bay for $85.00 in box and I can say that it is of great help with week signal in SSB and CW [Random Noise Reduction + AGC push in], the Tone Noise Reduction also is fantastic to leave it constant push in, for digital mode it has an extremely effective combination of filters.
73 and good DX.
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W5KG
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Rating: 4/5
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Aug 13, 2005 08:07
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A Good Addition to Shack
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Time owned: 0 to 3 months
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Not as good as DSP in newer rigs but it works very well with older rigs. I use mine with SB 102 and TS 450S. The auto notch makes it worth the money.
If you can get one at a ham-fest at a good price you wont be disapointed.
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VK3KBC
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Rating: 4/5
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Jul 9, 2005 06:44
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Great for CW and RTTY and OK for SSB
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Time owned: more than 12 months
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I purchased my Timewave DSP-9+ second hand from a hamfest for AU$60.00. I was intending to use it on SSB with my TS440SAT.
When I first tried it out, I found the DSP artifacts made the SSB voice sound 'odd' and it took a bit of getting used to.
After a while and a bit of trial and error, I found that if the IF shift on the TS440 was a little on the low side, and the radio's bandwidth switch was set to wide, the DSP-9+ would produce a very good quality audio for signals right down to the noise floor.
This is fine when the band is not crowded, but becomes a bit of a problem when selectivity is required.
With the radio filter set to narrow, the recovered audio is a bit harsher and more artifacts are noticeable.
If the audio is barely discernible without the filter, it will often be discernible with the filter using these settings.
The unit behaves differently with respect to different sources of noise however.
Generally it does well, but some noise is difficult to remove and for SSB, I would only rate it a 4 out of 5.
The unit does really well with RTTY and CW though.
The different bandwidths that can be set for CW really make a difference and with the TS440 filter on narrow and the DSP-9+ on narrow, the recovered audio is clear and sharp down to very low signal levels, albeit that the recovered audio sounds a bit like you're working inside a submarine on these settings.
With the wider filter settings, the CW audio is quite good.
The auto audio notch filter is very good and will remove the carriers that tune on your frequency whilst you're trying to receive a DX station, although there is some interaction when you select the notch and the noise reduction simultaneously.
I have compared the unit with a BHI NES 10-2 DSP Speaker and for CW and RTTY, the Timewave DSP-9+ is better in my opinion, but for SSB, the NES 10-2 is better in almost all situations. The DSP-9+ does compete well at times, but more often than not, the NES unit has far fewer artifacts and has a much lower noise floor with a better recovered audio than does the Timewave unit.
I have also recently purchased a W9GR DSP II and am very impressed. I will post a seperate review for it.
Overall, for SSB, I would definitely choose the NES BHI 10-2, then the W9GR DSP II, and then the Timewave DSP-9+ in that order.
For someone only interested in improving the audio quality of SSB and FM signals, the NES unit is recommended.
For CW and RTTY, the Timewave and W9GR units are both very good and the NES unit is not very suitable in my opinion.
If you can get one of these Timewave DSP-9+'s for the right price, then buy it if only to get rid of the occasional carrier on the frequency when chasing DX.
It will improve the audio on noisy bands and make listening easier in most cases but not all, although you may have to sacrifice reciever selectivity to gain a more pleasant sounding recovered audio.
If you're a CW fan, then you won't regret one of these if you need to filter out adjacent signals and noise.
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WK4RC
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Rating: 5/5
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Oct 9, 2001 22:57
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Great Performer
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Time owned: more than 12 months
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I bought this unit a number of years ago and used it with much success on my TS450S during a number of CW Sweepstakes. Could seperate adjacent signals with ease and pick out the weak ones! Use it with my TenTec Argosy and really enjoy the NEW performance given to this rig with the Timewave hanging on it! I would not part with this unit and plan on using it on all of my old TenTec's whenever I need to cut band noise during the solar downturn. If you have an older rig or want to pick up on a fine older rig without the DSP built in this is the way to go and save some money in the process.
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