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Details about  Kneisner & Doering KWZ-30 DSP Receiver ***VERY SCARCE***

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Kneisner & Doering KWZ-30 DSP Receiver ***VERY SCARCE***
Item Sold
Item condition:
Feb 12, 2012
US $1,799.00
$24.55 Economy Shipping | See details
Item location:
Lamar, Pennsylvania, United States


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  Feb 12, 2012 06:19:35 PST  View all revisions

Item specifics

Condition: Used  
Visit Store:   bigapple59

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This sale is for the German made Kneisner & Doering KWZ-30 receiver with DSP integrated within it's circuitry.  In all the years that I have been selling receivers on Ebay, I have only seen two other occurrences of these KWZ-30's being listed.  And while most receivers are manufactured in the thousands, or the tens of thousands, this unit numbers very small in production run.  Introduction to the market was in 1997 and I do not know the precise quantity that was produced, but suspect that it was under 500 based on it's availability.  I would say that it is easier to spot a solar eclipse than to find one of these KWZ-30's for sale.  Not only are they scarce, but the owners do not like to surrender them.  My personal unit is being offered to help me pay family college expenses and medical bills.

The selling price on the KWZ-30 is set in accordance with desireability, performance, rarity, and condition.  If you do not agree with my selling price, do not be concerned as I will plan to reduce the price over time until both buyer and selling price come together.  Thank you!

The KWZ-30 is used, but clean and in very nice condition.  If you look closely at my pictures, you will see some hints of use, but nothing major.  As for operation, the receiver works beautifully with great sensitivity and exceptional reception.

Included in this sale are the KWZ-30 receiver, a copy of the English user manual, extensive Radio Netherland test report, copies of reviews found in WRTH and Passport to World Band Radio, and the regulated DC power supply.  There is a good reason for including this power supply that I will discuss a bit in the description below.

As mentioned, this is a DSP (digital signal processing) receiver whereby the analog signal is converted to digital format so that it may be manipulated for better reception.  Various processes within the receiver offer improved signal handling capability, reduced noise levels, and enhanced capabilities with AGC and IF bandwidths.  This DSP integration and signal path allow the receiver to operate superior to virtually any receiver I have tested.  There may be a couple of receivers that have an operation or two that I prefer, but this does not make them superior receivers per se. 

Apparently I am not the only person that recognizes this receiver's capabilities.  World Radio and Television Handbook states:

"Underneath the unassuming exterior is an extraordinarilly capable receiver which in some ways offers the best HF reception performance that we have ever seen."

"The final verdict is that the Kneisner & Doering KWZ-30 is an receiver that should be carefully considered by those seeking the best possible performance."

Radio Netherlands Test Review states:

"The KWZ-30 probably isn't the receiver of choice for a beginner or strictly a program listener, but for intermediate to advanced shortwave listeners that appreciate an advanced technology receiver, this receiver is a beauty.  We give it 5 stars on our 1 to 5 rating scale."

Because this is a DSP receiver, the DSP controls such functions as operating mode, noise reduction, notch, squelch, passband, and AGC.  Utilizing dual processors, the KWZ-30 is able to offer features not typically associated with analong receivers.  For instance, there are 100 separate settings for the noise reduction.  I have used the variablity of settings in the noise reduction to enable me to hear a clearer signal by minimizing the noise without adversely affecting the signal.  Basically, you would turn on the noise reduction and vary the intensity of the reduction weighing noise versus the loss of fidelity of the signal and work to keep the noise reduction at the best setting for best signal.  The 100 settings for noise reduction gives the user a fantastic amount of flexibility. 

The DSP circuitry in the IF bandwidths is exceptional.  Most receivers with standard bandwidth filters will usually have 2 IF filters, but can have as many as 6 filters.  This can affect the ability to receive certain modes of signals.  For instance, you may be able to receive AM signals, but will need a narrower filter for SSB and an even narrower filter for CW.  If your receiver doesn't have the proper bandwidths, you will have compromised reception.  However, with the KWZ-30 receiver, you will discover 14 bandwidths that begin at 50 hz and extend ever wider up to 9 khz.  This will allow reception for Digital, RTTY, CW, SSB, AM and narrow FM modes without the necessity to purchase additional bandwidth filters.  Then not only do you cover all reception modes, but you have optional filters within each mode...sharp or standard CW, narrow or wide sideband, or narrow, medium or wide AM!  Here is a list of the IF bandwidths as seen on the display:

When using the AGC with this receiver, you have wonderful capabilities to expand the settings to meet your requirements and preferences as the DSP offers so much more flexibility.  For instance, most receivers offer AGC fast, slow, and off.  Some may even offer the option of medium AGC.  But with the KWZ-30, you can also set items such as attack, hold, decay, and digital gain.  The only other receiver that I have used with these features retails for over $4,200!  You can see the AGC options here and would set the option by pressing the corresponding number on the keypad:

What I find fascinating with the KWZ-30 is that it was designed and manufactured by Mr. Kneisner and his small team.  Unlike some of the major manufacturers that have scores of technical and marketing people, the KWZ-30 was brought to market on a shoestring budget.  Considering the design and performance of the receiver, this is actually remarkable.  I like to consider this like the Ferrari of shortwave receivers....elite, high end, and small production run.  However Mr. Kneisner passed away within the last year so now this receiver, the remarkable achievement that it is, can no longer be manufactured and it's scarcity is forever guaranteed.

One of the things that I have noticed in visiting hobby radio sites over the years is discussion concerning the tuning of any given receiver.  This can include such things as feel, tuning resolution, and tuning speed.  As for feel on the KWZ-30, it is hard for me to imagine a more pleasant tuning arrangement.  The tuning knob is heavy machined metal surrounded by a band of rubber and has the highest degree of professional ergonomic feel to it.  When spinning the knob, the weight of the machined metal propels it easily across the receiving band with a flywheel affect.  Additionally, due to the inclusion of DSP, both tuning resolution and tuning speed can be user driven.  The tuning resolution can be altered and can be set for tuning steps as slight as a single hertz.  The tuning speed can be adjusted for your individual taste....like it fast or like it slow, the KWZ-30 can accomodate whatever you desire for your listening needs and listening style.  Thus, the KWZ-30 can be set to any number of user preferences regardless of how particular you may be with your needs.

The KWZ-30 uses the DSP technology to eliminate the need for a carrier in the AM mode.  In effect, this eliminates the need for synchronous detection as there is no carrier signal to become distorted over long transmission distance.  Additionally, since the receiver tunes in such fine resolution, you can easily to AM broadcast signals in sideband using ECSS (exalted carrier selectable sideband) which offers excellent intelligibility with minimal fade distortion.  Also, by tuning AM signals in sideband, you can choose either the upper or lower sideband to avoid sidechannel interference.  And because the KWZ-30 offers such flexibility with bandwidths and passband tuning in sideband, you can listen to a signal using wide upper or lower sideband to maximize the blocking of sidechannel interference while retaining the highest fidelity.

Another thing that is really unusual about this receiver is that the headphone jack is set for use with stereo headphones.   I discovered this by accident when my standard mono headphones did not work except by partially removing them from the jack.  By using stereo headphones, I got excellent sound and reception that I could not get with my typical mono headphones.  Of couse this is not always a benefit as during DXing, but for program listening to strong signals, you will hear a wonderful sound on shortwave that you never knew existed.  The signal will not be in stereo, per se, but the use of high end stereo headphones will enable you to hear the highs and lows that often get attenuated out of the audio path.

Regarding the power supply, you cannot use a standard AC adaptor with this receiver.  The draw of the receiver is 2.5 amps if turned up loud and if you do not use a good regulated power supply, the receiver begins to do funky things on the display whereby some of the display will become scrambled or disappear altogether.  I discovered this by accident and then was informed by a seasoned KWZ-30 owner that a good power supply is an absolute necessity when using this receiver.  Accordingly, I have included a Pyramid 3 amp power supply with this sale so that you do not need to purchase such a thing separately.  Normally such a PS will cost around $40 - $50. 

Let me now list some of the features of this receiver:

  • Tuning range of 50 Khz to 30 Mhz (with reduced sensitivity down to 6 Khz)
  • Operational Modes of AM, LSB, USB, Digital, CW1, CW2, CW3, and FM
  • 14 Bandwidth choices of 50 Hz to 9 Khz
  • Dual VFO's
  • AGC that can be user set
  • Notch
  • Noise Reduction that can be user set
  • Tuning resolution that can be user set from 1 Hz to 50 Khz
  • Tuning speed that can be user set
  • Menu languages of English, German, or French
  • S-meter that can be set for hold time
  • 4 softkeys that can be programmed with user preference (as bandwidth, VFO, mode)
  • 250 Memories that can store frequency, mode, notch, passband tuning, noise reduction settings, and filter bandwidth
  • Passband tuning
  • Large forward facing speaker capable of handling up to 8 watts and delivering nice sound
  • Headphone jack
  • Line out jack
  • RS-232 jack for computer control
  • Heavy duty front tilt feet

I have thoroughly enjoyed using this receiver the time it has been in my possession and there are only a couple of worthy competitors in this price class.  But the KWZ-30 offers terrific programmable features not found in other units at any price class.  It is a shame that they are so rare and that the technology to produce such an instrument is not currently being exploited in the buyer's market.  Computer programmable DSP receivers are all the rage, but this is one of the last and best "hands on" receivers ever made by anyone anywhere.

If you have any questions, I am happy to try to answer them for you.  One of the best sources of information for this unusual receiver can be found in the extensive review on this site:

click here for the Radio Netherlands Test Report

Most questions will tend to relate to shipping the unit to your destination.  For buyers here in the USA, you may use the Ebay calculator for your cost to ship.  This is a heavy receiver made heavier with the inclusion of the 3 amp power supply.  The cost of shipping includes all necessary packing materials, actual shipping, plus full insurance.

Those buyers who reside outside the USA may also purchase this receiver.  I have shipped to over 50 countries during the past year and am happy to ship to your location.  Shipping will only be possible via Express mail so that I may be able to fully insure the unit during transit.  If the actual shipping cost is less than what is invoiced, I will refund back your overpayment.  So that I may be able to fully receiver's value with insurance, I will need to state the actual selling price during shipment.  Please remember that the shipping cost does not include any import, duty, customs, or VAT fees which will be extra if they are collected in your country.  It would be my recommendation that you do not have me ship the power supply to you and save you the cost of the additional weight for shipping.  Should you decide to have me remove the power supply, I can reduce the selling price by $25, but also likely reduce the shipping cost another $20 or more.  Thus, you can save the price of $45 and apply that to a power supply configured to your local current requirements as long as is is a reliable regulated power supply can provide a minimum of 3 amps at 12 volts DC.

If you live in the USA and would like to pick up the receiver, you may do so.  I reside just 1 mile from I-80 at exit 173 in northcentral Penna at Lamar.  This location is very convenient here in the northeast as it is within a 4 hour driving distance of major population centers such as NYC, Philly, Pittsburgh, DC, Cleveland, and Baltimore.  Picking up the receiver will enable me to demonstrate it for you and allow you to ask operational questions. 

Payment to be via cash if the KWZ-30 is picked up or via Paypal if the unit is to be shipped to your location.  Ebay does not permit sellers to list alternative methods of payment and their listing guidelines warn sellers that a listing will be removed should an alternative payment method be offered.   Please email if you have any questions. 

Penna residents are reminded that they are responsible for the 6% state sales tax.

Thank you for taking the time out of a busy day to look at my Ebay listings!

I am sorry for the reflections on the keypad.  I have reduced the brightness of this picture so that you could see the buttons more clearly, but I should have taken the picture from a different angle:

SquareTrade © squaretrade warranty v2.0

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