Home
             
home products support company info   view cart
 

 

Material on this website:  copyright 1997-2012. It may be printed for your personal use but may not be used for commercial purposes, copied, or altered and posted on other websites

Array Solutions

Phone
(214) 954-7140
Fax
(214) 954-7142

Email Us

 

Filters and filter switching systems.

 
bullet 200W W3NQN band pass filters ( including 60 meters)
bulletNEW BandPasser Singles Economical 200W Band Pass Filters
bulletFM-6 filter switching system that can switch filters as directed by a band decoder or switch
bullet FilterMax III -  6 W3NQN Bandpass Filters In ONE Compact BOX with removable and replaceable filters
bullet BandPasser model AS-419 economical 6 band automatic or manual 200W band pass filter system
bulletMARS filters 
bullet2,000W low pass filters for reducing harmonics.
bulletMilitary HF, Commercial HF, and Marine Communications systems

W3NQN Filters made by W3NQN himself or by Hamation ?

Recently, we have become aware of some negative comments about our bandpass filters. The claim is that since we supply W3NQN bandpass filters that are made by our business partner, Hamation, that the filters Hamation makes are somehow inferior to those made by W3NQN himself. This is not true.

Hamation makes our W3NQN filters using the same value components as those made by W3NQN and as a result, the performance is virtually identical.

The measurement at the right shows, as just one example, both the W3NQN-built 80m bandpass filter and the Hamation-built W3NQN filter. With the exception of slightly better attenuation at higher frequencies (above 8 MHz) on the Hamation built filter, they are identical where it counts.

(Click the image to the right for a full size version that you can inspect more closely).

These filters and filter switching systems are based on the article in the May and June 1998 QST article by Ed Wetherhold, W3NQN.

We know these filters achieve a level of selectivity and a  level of low in-band insertion loss that will be the benchmark for all other filters to be measured by. Below you will find detailed plots of the performance of these mono-band filters. 

The design is based on a three-resonator filter configuration and uses very high voltage, low loss, NPO ceramic capacitors, paralleled throughout to increase current handling capability and reliability. We will first review the mono-band filters, then we will show you systems that will enable the serious SO2R operator to achieve the highest performance possible in reducing harmonics, hash, phase noise, and probably save your receiver front ends.

These filters are absolutely necessary to prevent receiver front end damage in any multiple HF radio environment.

 

bullet

W3NQN Single Band Transceiver Bandpass Filters including WARC and MARS Bands

 

W3NQN Original mono-band band pass filters

Array Solutions is very proud to be the exclusive distributor for for these Great single band filters.

Single box design, made and tested by Ed Wetherhold, W3NQN or K7MI @ Hamation to W3NQN specifications.

 

W3NQN Band Pass filters are the best single band filters you can buy.

Each one is hand-made by W3NQN or by K7MI to W3NQN's specifications. The performance of these W3NQN design filters, regardless of who assembles them is the same. We will fill your order using the filters we have on hand when you place your order.

Hamation's filters are those that have been used in our FilterMax units for years and we are now also shipping them in single band packaging.


From time to time, we may be out of stock of one or more of them.


If you are planning a DXpedition or a contest expedition where you will need these filters, please order in advance and let us know when you actually need to have them in your possession. We will work with you to meet your schedule.
 

Typical Specifications for these filters are as follows:

Bands Power <2:1 SWR Insertion loss in band Insertion loss 2nd harmonic Passband SWR
160, 60,80, 40, 30, 20, 17, 15, 12, 10 Meters 200 Watts CW, RTTY, SSB

<.3db Typical

-50 to over 75 db depending on Band <1.2:1

 

Usage

These filters will tremendously reduce harmonic energy and  wideband phase noise transmitted by nearby transmitters, and reduce receiver de-sensing caused by nearby transmitters, and closely located antennas in any multiple transceiver environment.

For instance the single operator two radio (SO2R) contest operator, multi-single (M/S)  and Multi-Multi (M/M) operators looking for a new level of performance. These kinds of filters should also be useful for monitoring facilities that are also transmitting information on nearby antennas.  We can custom design filters for other frequency bands.

Specification Plots of the W3NQN filters  

If you have trouble seeing the data just right click on the plot and move your curser to "save as". You can then download it to your system for viewing with your photo software or printing on your printer.  I intentionally left the resolution high on these plots to allow you to view or print this data on your system at high resolution.

 

      10 Meter Plots      

   

 

15 Meter Plots

20 Meter Plots

40 Meter Plots

80 Meter Plots

160 Meter Plots

As can be seen the second harmonics are 70-80 db down from the fundamental and the insertion loss is ~.2dB.  These numbers are twice as good as the nearest competitive filter. 

To make the filters more flexible for an SO2R type of operation it is necessary for the operator to be able to listen on two bands at the same time, and be able to switch bands quickly. A switching matrix can be added to a stack of six of these filters to accomplish this. We call it the Filter Master or FM-6.

bulletWe have added a 60 meter version of the filter. The specifications are the same as the standard units above. Plot is below

 

 

bullet

MARS and WARC band versions of the W3NQN filters are available 

FM-6 Filter Master

The Array Solutions FM-6 is a high quality 50 ohm strip line design RF matrix with very high isolation between the filter ports.  Using the available double shielded cables, a set of 6 W3NQN bandpass filters can be easily configured externally with the FM-6. They can be bound together with hook and loop fastening tape into a compact package. The beauty of this set up is if you have a filter failure, it can be quickly replaced with another mono-band filter section or bypassed temporarily.  Also you can mix an match filters from any manufacturer like our Array Solutions line of economical band pass filters. A set of two FM-6s filter systems is the highest level of isolation between filters possible. And the reliable W3NQN filters are the most robust and best performing filters on the market. 

You can also use the less expensive Array Solutions AS-### series of monoband filters to create an efficient and cost-effective switching filter system with the FM-6

We also offer the COAX-12, which is a set of 12 double shielded coax cables to properly connect your filters to the FM-6

To make it even easier we have set up various combination packages on the shopping cart.

FM-6-NQN  - includes the FM-6, COAX-12, and 160/80/40/20/15/10m W3NQN mono-band filters

To control the FM-6 from a band decoder, you need to source +12 per band. If no band is active in the FM-6, it is in bypass and will allow operation on any frequency, 1.8 to 54 MHz.

    Pricing/Purchase

 

 


 

FM-6 on top of a W3NQN stack of 6 filters strapped together, all that remains is to take off the red caps and hook up the COAX-12 cables.

Specifications: FM-6

bulletSWR from DC to 30 Mhz less than 1.1:1
bulletInsertion loss DC to 30 Mhz less than .1 db 
bulletRelays 12 V DC 20 ma - 4 amp contacts small signal relay hermetically sealed gold contacts
bulletIsolation between filter sections over 110db, we can't measure it since unused sections are grounded
bulletPower rating 250 Watts continuous @ 30 Mhz
bulletControl connector DB9 and it is supplied with a 5 foot control cable
bullet50 ohm micro-strip design on G10 solder masked protected double sided board 
bulletConnectors are silver plated SO239 and Teflon insulators 
bulletWe can supply this unit with 12 matching double shielded high quality cables. This is important for high isolation.

Download the Users guide (acrobat .pdf)

Pricing/Purchase

 

2 kW High Power W3NQN RF Harmonic Filters

State of the art high current and high-Q capacitors

 

bullet2 kW Amateur band filters are available to solve those difficult interference problems these are meant to be placed at the output of the amplifier, or at the output of the SixPak antenna switch to add tremendous harmonic and hash reduction.  Bands available 80m, 40m, 20m only.

INSERTION & RETURN LOSS RESPONSES OF 2 kW  40m FILTERS

Designed to attenuate the 2nd and 3rd harmonics of high power amplifiers

NEW IMPROVED Design and Power handling 160m thru 20M now available! All have similar plots.

 

Pass band insertion loss is under 0.15 db as can be seen in these plots where 20m is .18 dB and the 40m filter is .15 dB.  The 2nd Harmonics are over 80 dB down!

Dimensions 20m 15x4X3 inches

____________________________________________________________________________________

How well do they work?

Jay,

At the NY4A contest station we use a long 20 meter Yagi suspended inside a long
40 meter quad. Models indicated a 30 db isolation between a 20m harmonic on the
40m antenna and the 20m station on the 20m antenna. Though this is good
considering the proximities in the design, we were concerned the 20m operator
stood to be crushed by 2nd harmonic garbage from the 40m station.

We purchased the W3NQN high-power 40m low pass filter and placed it in the line
right after the 40m amp to get another 80 db of isolation, bringing the total to
110 db. 

Afterward 20 meters was completely free of 40m hash and noise, and the 40m
harmonic was no louder than any middle strength station on the 20m band. Ran 1500
watts CW out into the filter all night long, no smoke, no funny smells. 

Math: 1500 watts @ 50 ohms = 275 volts. 54 db down for for second harmonic from
amp = .549 volts (QST test on AL1200). 30 db down for antenna natural separation
= 17.4 millivolts. 80 db down for NQN filter = 1.74 microvolts. Just another
moderate 20m signal. 

73, Guy K2AV


Co-located military, commercial radio, and marine communication systems

bullet

We have developed Short wave bandpass filters for military, commercial and marine shortwave communications.  They have the same electrical performance shown in the plots above. But we can also design and manufacture special filters to your application.  For instance we have a 2-30 Mhz filter system that breaks up this range into 10 segments.
 

bulletCustom bandpass filters are now also available for taking out special interference problems as well.  Such as a loud short-wave broadcaster who is de-sensing or causing IMD problems in an amateur band.

Pricing and Ordering 

Click here for price list and ordering information see bandpass filter section.