Reduce Scrapping and Smelting, Promote Component Reuse > Engine Powered
> Diesel
> DuPage County
> Save 20% channel guard cb filter stops bleedover dead
Save 20% channel guard cb filter stops bleedover dead
* * * SICK OF CHANNEL BLEEDOVER INTERFERENCE? * * *
CB is popular again. Maybe even too popular. Either the skip cycle is in, with great DX to crowd every channel, and all the Hams converting CBs to 10 Meters. Or the skip is dead, so every local guy in town seems to be busy talking to his neighbor at the same time as you. Many stations are overpowered and overmodulated, and are guaranteed to make your operating miserable with splatter and bleedover. Fed up with hearing the guy down the street ten channels away? The CHANNEL GUARD will stop him cold!
Fits all PLL- or crystal-synthesized CBs with a 7.8 MHz or 10.695 MHz I.F. frequency. Installs in minutes with common tools and no special knowledge. Works on AM, FM, and SSB receivers.
See the graph. Our 2-pole crystal filters for 10.695 MHz and 7.8 MHz are specially designed for SSB rigs, but work great in all modes. It's installed at an early point in the signal path, before the signals branch off to the separate AM, FM, or SSB detectors. The result: razor-sharp selectivity in every mode. Since the "Q" (Selectivity Factor) of a crystal is many times higher than the normal tuned I.F. transformers, the strength of interfering signals even slightly off the center I.F. frequency drops off very quickly. Bleedover is dramatically reduced!
Most newer CBs use a 10.695 MHz I.F. frequency. The newer AM-only or AM/FM-only radios almost always use a 10.695 MHz first or high I.F. The newer SSB CBs and 10-Meter models are all 10.695 MHz at the high I.F. Many older SSB models, both PLL- and crystal-synthesized, use a 7.8 MHz I.F. Some SSB models also have a 455 KHz stage that's just for AM and/or FM; you can usually install our 10.695 MHz filter in these radios at the high I.F. position and it will work in all modes.
See the photo above. Installation is a simple matter of unsoldering a small ceramic disc coupling capacitor in the radio's I.F. circuit and pushing 2 of the 3 CHANNEL GUARD bare wires into the corresponding empty INPUT & OUTPUT holes left by the capacitor; you then connect the third (center) bare wire to chassis ground and the long colored wire to +8-13 VDC. Some CBs include a simple but broad 10.7 MHz ceramic filter which they install in place of the coupling capacitor. (It has 3 leads on the bottom and looks like a crystal case from the top.) Our filters come with detailed instructions that includes the specific parts to remove for most radios. If it's not on our list or you're not sure it will work in your radio, send us an email or stamped return envelope with your model number and we can usually answer your questions.
In most SSB radios the signal path is such that our filter works on AM and FM too. Simply unsolder the correct I.F. coupling capacitor that we list in the detailed instructions, solder the INPUT and OUTPUT bare wires into those now-empty holes, solder the third (middle) GROUND wire to a convenient chassis ground, and the long colored wire to +8-13 VDC. You are done!
Our 10.695 MHz filter really cleans up all the Uniden & Cybernet export or 10M "Ham" radios, and all the copycat clone versions. And in every mode, AM, FM, or SSB! (Examples include the Uniden HR2510/HR2600 and the Cherokee, Connex, Eagle, Galaxy, Ham Int'l, Magnum, Mirage, Northstar, Ranger/RCI, Superstar, or TriStar brands.)
IMPORTANT! The 455 KHz ceramic filter shown in the photo above is now discontinued due to low demand. In most newer CBs the 10.695 MHz filter can be used and with even better results, since crystals are much sharper than ceramics.
* Provides up to 100 dB adjacent-channel rejection. This is much better than the majority of CB transceivers, which typically specify only -40 to -60 dB. A factor of "100 dB" means that any signal outside the normal 10 KHz CB channel spacing is reduced in strength by a factor of 10 billion from channel center. Turn your ordinary rig into a hot performer!
* No reduction in receiver sensitivity. In fact, the CHANNEL GUARD adds one stage of amplification at the most critical point-right in between I.F. filtering stages. You may even hear those weak signals that you missed before.
* Every REACT monitor needs one to eliminate Channel 9 bleedover.
* Quality components used. Each CHANNEL GUARD is hand-made and is thoroughly tested against a powerful 30,000 V modulated test signal. Just solder it in and forget it!
REMEMBER TO SPECIFY EXACT RADIO MODEL!
We combine multiple sales to save you money.
All other countries add $9 Air Mail.
Tel/FAX: (***) 434-9227, (***) 298-7980
