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Summer 2008 Catalog
Welcome!
first year Inrad ownership, we're pleased provide some roofing filter mods several radios, with more come. Inrad's emphasis service unchanged, course first priority help most your radio providing best filters anywhere, often prices much lower than what radio manufacturers offer. hope visit site what's new.
bandwidth filter's "shape factor." perfect shape factor would Typically, encounter shape factors more crystal filters current amateur use. Refer page further information shape factors.
What's Difference Between Quartz, Ceramic, Mechanical Filters?
Filters made cascaded resonators. These quartz crystals, mechanical ceramic devices, actual coils capacitors. Each device acts resonator known "pole" filter. selectivity provided filter depends number poles has. Quartz crystal resonators offer extremely high selectivity stability most expensive use. Mechanical resonators made quite small, take very harsh environments, intermediate performance cost. Ceramic resonators small, lowcost devices that provide acceptable performance less expensive radios. Crystal filters available over wide frequency range. Mechanical ceramic filters generally used only. Older equipment used combinations coils capacitors. While they enjoyed some advantages, they used main selectivity devices modern radios. International Radio Corporation supplies crystal mechanical filters many different radios.
Short Course Radio Filtering
Many radio amateurs explain filters work their radios, help them decide which filter will work best their needs. your convenience answer these questions this catalog. will also help telephone E-mail, when time permits.
Filters Work Radios
today's crowded band conditions, adequate selectivity most important characteristic receiver. radio's ability separate signals depends largely upon number quality crystal filters contains. Most receivers today conversion superheterodyne principle will have three intermediate frequencies. first generally region will contain pole crystal filter, usually monolithic construction. signals pass through this filter usually rejects those that tune more kHz. This filter important reducing effects very strong signals that close tuned frequency. first converted down second where second crystal filter used increase selectivity. Most radios come with minimum filter second standard feature. Typically, this filter, which used transmitting generator. Many radios have optional slots allowing operator customize modes prefers. might filter optional slot, perhaps narrower filter improving reception heavy QRM. Many radios convert second output audio. Some high performance radios have additional with more filters. third usually there more optional slots available this frequency. Another filter "cascaded" here with second This essentially doubles selectivity provides optimum performance that particular radio.
Contents
Welcome Products Enhancements Mods Vintage Yaesu Filters Modern Yaesu Filters Kenwood Filters Icom Experimenters AOR/Heathkit/Ten-Tec/Drake Collins Filters Filters Crystals Custom Filters Orders Frequently Asked Questions Contact Discount Page Page Page Page Page Page Page Page Page Page Page Page Page
Comparing Filters Shape Factors
Filters generally described terms minimum bandwidth points. Thus, "400 filter refers with minimum bandwidth second bandwidth, usually taken maximum indicates selective filter rejecting strong signals sides. From these values determine number that lets compare effectiveness filters. ratio filter's bandwidth
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Products
FT-920 Roofing Filter
Coming soon! Check website announcements.
IC-756 Pro/2/3 Roofing Filter Mods
International Radio excited announce developed roofing filter modification popular Icom IC-756 IC-756 radios. These roofing filters help reduce third order intermodulation from multiple strong signals region either side tuned frequency. Installation provides substantial improvement close dynamic range radio Please document titled Words about Roofing Filters." more details. This modification intended those with advanced soldering modification skills, possibly beyond that normally possessed average radio amateur. Professional help advised confident that have this ability. Full installation instructions provided with kit.
TS-950 Roofing Filter
Installation simple requires soldering ground wires. coax moved another added. Full installation instructions provided with kit.
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Enhancements Mods
Roofing filter mods available several types radios. These kits substantially improve close-in intermodulation performance blocking dynamic range radios. Upgraded radios perform nearly well crowded band conditions newer, very expensive radios market.
Omni Roofing Filter
Available with 2400 filters. This Omni roofing filter improves dynamic range Easy installation. (This also applicable Omni models.)
Icom 765/775 Roofing Filter
Icom 765/775 Roofing Filter works either 775. filter bandwidth kHz. Installation easy moderate 775.
FT-1000D Roofing Filter
With FT-1000 FT-1000D need remove boards from radio. designed next board. Steep sided, multipole crystal filter bandwidth. high-dynamic range amplifier makes filter insertion loss.
FT-1000MP Roofing Filter
This filter improves dynamic range improves blocking dynamic range Easy installation, plug-in solder wires Mark need remove boards from radio. Steep sided multi-pole crystal filter bandwidth. high dynamic range amplifier makes filter insertion loss. Feb. 2005 Jan. 2005 RadCom product reviews.
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Pulser
Pulser keys transmitter predetermined duty cycle allow tuning safe average power level. tuning amplifier, trouble-shooting TVI, keying tests. applicable digital circuit that provides accurately controlled duty cycle, adjustable from 20%-100% steps 10%. Maximum keyed voltage Maximum keyed current Nine volt battery supplied; operating battery life greater than 1500 hours.
FT-1000MP Noise Reduction
This introduced several years ago. Adds gain after 70.455 amplifier before mixer 8.215 filters. gain lower frequency then reduced through menu item. result noticeable reduction hiss reduction noise floor receiver yielding more sensitive receiver with more pleasing sound. This will plug into FT-1000MP; installation takes about minutes. FT-1000MP-Mark Mark Field, will have solder connections. Full instructions diagrams included. This still good choice many operators. cannot installed Roofing Filter installed, though. Talk aren't sure which right you.
FT-1000MP Click
keying rise time fall time fall time responsible somewhat wide signal that generates This improves keying slowing voltage change over from receive transmit back points boards. Results: Before after measurements shown below.
Rise time Fall time Modified
"This best money I've ever spent radio. difference dramatic exceeded expectations even after listening other satisfied customers yours. Thanks such great product."
FT-1000MP Improvement
With parts, easily installed. Slows recovery time when operating FAST mode. Improves readability large signal, multiple station pile conditions. great expeditioners. Works modes.
occupied bandwidth signal reduced less.
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Omni Receive Audio
Change simple parts significantly improve audio response. This widens audio pass band improves low-end response.
FT-847
Provides adjustable capability powered through mike connector radio. mini-phone jack Heil microphones 8-pin mike connector Yaesu other microphones. On/Off switch back lets disable other modes. Comes prewired FT-847, easily rewired other rigs that don't have VOX.
Unmodified points 2107 2104 Inrad modified points 2800 2830 ARRL Test Report "The works great results very noticeable. Thanks again making Omni great transceiver should be."
FT-920 Switch Board
This allows cascade filters. Inrad filters Inrad filter with filter. Select both filters toggle switch mounted existing hole radio's case. used there room mods want both modes. Filters included with this kit.
Front-End Filters
Inrad stocks front-end filters that used environments where there many strong interfering signals, such locations near high power broadcasting transmitters multi-transmitter contest stations. These filters have input output impedances designed front receiver. They transmitted through very levels. Incident power levels must held below prevent crystal damage. These 8-pole crystal filters.
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ICOM-765 Full Keying
Improves keying full QSK.
Four-Pole Filter Kits
FT-101 WARC Band
FT-101ZD. Adds meters FT-101.
Contact Information
We're happy take your telephone e-mail questions, cannot always respond quickly might wish, please patient. West Coast USA-note time zone differences call between 9.a.m. p.m. here, leave message. E-mail great: sales@inrad.net. Also, able your questions answered quickly someone already filter thinking purchasing. site: www.inrad.net click link Inrad User's Reflector. monitor reflector too. Thanks your business, Trey N5KO Mark AG9A
featuring low-cost filter kits. Four specially color-coded crystals along with surface mount capacitors supplied with each kit; #350 #351 2400 Center frequency 9000 impedance ohms. These just ticket that receiver transceiver project. Other bandwidths made available future. (See pages more products interest experimenters.)
Managing Interstation Interference
Have ever operated multitransmitter environment experienced interference? trying SO2R burning radios? Does multiplier station overload receiver? Then need Managing Interstation Interference George Cutsogeorge. ON4UN says: "George covers every imaginable aspect interference problem this book." N3BB says: "This important material amateur operator absolutely essential contesters with multiradio stations."
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Filters
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Filters
stocking bare filters upgrading radios experimental uses with customer-designed installations. Generic instructions interface these filters provided. There radio-specific instructions available. These filters with minmum bandwidth kHz.
Crystals
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Custom Filters Special Orders
have almost type discrete filter made, beable exact replacement case locations your radio, have wire must have minimum filters made. feel there place them product line, will typically (and perhaps some friends) purchase five, will sell other five. Prices will comparable with regular line. filter that discretion) will become part regular product line, there will one-time engineering $350 design, must purchase minimum filters. terms such orders with order time delivery. Expect about weeks delivery. slightly different from nominal center frequency filter ripple small distortions pass band. BW60 filter bandwidths Shape Factor ratio bandwidth bandwidth, figure relative merit filter. smaller shape factor, more selective filter. This good compare filters. insertion loss filter determined adding figure value shown from graticule point where filter curve crosses center frequency line. curve shown here, curve crosses line insertion loss filter under test custom that uses wide-band transformers match input output impedances. generator very phase noise type 9850), operating under computer control. curves taken automatically computer stored .gif files site.
Filter Curves
Selectivity: Quartz Silicon (Thoughts from W2VJN)
There hype there about great Well, let's look compares pair good crystal filters. don't need guess about this, selectivity numbers readily available product reviews various radios. data shown here obtained from reviews Radio Society Great Britain magazine RadCom. table shows measured receiver bandwidth nominal bandwidths listed under Filters.
Characteristic curves most filters shown site. They made with computerized sweep analyzer.
site filter curves many products. typical curve shown figure above. filter identification number upper left plot. Just below REFerence level graticule amplitude, axis. curves plotted with vertical scale division. horizontal frequency axis convenient value division, depending filter bandwidth. This value called span shown bottom right plot. inset right curve shows some important parameters filter. Fmax gives frequency which amplitude peaks. only radio with bandwidth advantage Orion, only SSB. Now, know that selectivity only important parameter judging radio, there some really differences this table, particularly bandwidths. This would surely have impact copying abililty crowded band.
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Frequently Asked Questions
high better choice?
most radios high closer radio's front end, filtering this point will improve close-in dynamic range. Typically, high frequency filters have about same degree selectivity. filters sometimes have additional ultimate attenuation. course high filters less expensive which factor buying just unit.
make special filter radio?
have almost kind discrete filter made, there some practical constraints. page information special orders.
much ripple
Most filters specified have less than pass band ripple. Many filters have less than some have practically ripple. Anything would noticeable. might notice difference between radios while listening same station side side.
What advantages using matched pair?
When filters cascaded, selectivity improves dramatically. Rejection adjacent channel will increased limit radio's capability. Also, ultimate attenuation channel signals will improved greatly. example, high frequency "blow that heard when tuning through strong signal with filter will disappear with matched pair. radio control, operation will optimized with matched pair filters.
important filter insertion loss?
Within reason, insertion loss problem. Most radios designed accept filter insertion loss without affecting sensitivity. gain distributed adequately from section section, front noise will overcome noise generated stages. insertion loss plus minus should change basic sensitivity radio. course, filter defective excessive loss, certainly will reduce receiver sensitivity. Some modern high receivers have built-in compensation which increases gain when narrow filters selected. Typical loss filters filters, narrowest units case.
choose filter bandwidth?
filters improve selectivity radios normally supplied with filter. improvement noticeable fidelity contesting well chewing crowded bands. filters most useful contesting where conditions severe. filters those whose priority audio quality rather than selectivity.
Which bandwidth best
most operating conditions bandwidth will work fine. It's wide enough tune around band good rate hunting contesting well. works well casual operation well when necessary move rapidly around band identifying stations. DXing crowded band digging weak one, will have edge. those tough situations meters, filters can't beat.
Isn't filtering better than crystal filters?
Yes, will have very steep skirts flat pass band. However, ultimate rejection good. Since digital processing must done audio very frequency crystal filters required higher IFs. These filters usually wider than bandwidth required widest mode operation. example, model crystal filter wide. then narrow bandwidth kHz, narrower. result works fine where bands uncrowded signals loud. However, during crowded conditions will "pump" when strong signal nearby. This make very difficult read signal interest. There substitute pair cascaded crystal filters highest level performance desired.
must some your filters wired
filters constructed with discrete crystals lattice ladder configuration. Some filters monolithic construction have less than crystals, packaged smaller containers. this reason, filters will have better selectivity most cases, they exactly where filters fit.
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Discount Policy
Filters: deduct Filters: deduct Filters:deduct
offer 30-day money back guarantee
products returned salable condition. (not including postage)
Please help including copy your sales receipt pertinent information. Pack product carefully insure your protection.
Discounts cumulative over more than purchase. discounts effect (e.g. special other limited sale addition rates above), only discount applied. Kits, mods literature discounted. Qualified dealers: discount with minimum purchase.
installations modifications done your risk. responsible damages your radio.
Shipping Handling Charges
charges apply items ordered. Priority Mail within USA. will ship Express Mail your request. will ship C.O.D. within USA. U.S. Postal Service C.O.D. charge will added your charges. will ship FedEx upon request charge exact cost plus handling fee. foreign orders, strongly recommend U.S. International Express, which fast insured traced. lower cost orders able ship regular mail lower cost, packages cannot insured traced, will judgment these. will save money where possible. Finally, must declare full merchandise value customs purposes.
International Radio Corp. P.O. 2110 Aptos, 95001
www.inrad.net email:sales@inrad.net Ofc.:831-462-5511 Fax: 831-612-1815
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