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Author Message   Tech808 Moderator Username: Tech808 Post Number: 2814 Registered: 8-2002 Posted on Monday, June 28, 2004 - 8:08 pm:        PLEASE PLACE ALL OF YOUR CHANNEL GUARD INSTALLATON QUESTIONS HERE. Lon Tech808   Bruce Senior Member Username: Bruce Post Number: 1316 Registered: 9-2003 Posted on Tuesday, June 29, 2004 - 2:29 pm:        Just a starting point ..... Place the filter AFTER the noiseblanker .... In some radios if you don't the blanker will not work. Also try to ADD the filter to the exsisting one now you have 2 filters not one.   Wrk3 Junior Member Username: Wrk3 Post Number: 25 Registered: 4-2004 Posted on Saturday, July 10, 2004 - 9:46 am:        there are a few stations in this area that are to darn loud and bleed all over me. will a channel guard cure my problem?   Tech808 Moderator Username: Tech808 Post Number: 2905 Registered: 8-2002 Posted on Saturday, July 10, 2004 - 12:45 pm:        Wrk3, Yes, the Channel Guard Filters will help with Channel Bleedover Interference. Lon Tech808   Tech808 Moderator Username: Tech808 Post Number: 2939 Registered: 8-2002 Posted on Tuesday, July 13, 2004 - 6:59 am:        10.695 MHz AM/SSB HOOKUP LIST BY PLL CHASSIS TYPE Cybernet PLL02A American & Canadian, PTBM048AOX or PTDM058COX AWA/Thorn 1503, Boman CB950, Cardon Iroquois 40, Colt 480, 485DX, 890, 1000, 1200 (Excalibur), Gemtronics GTX77, G.E. 3-5825A, HyGain 2705 (V), 3108 (VIII), J.C. Penney 981-6247, JIL Citizen MPL-5, SSB-M6, Lafayette Telsat SSB80, SSB120, SSB140, Midland 78-976, Palomar 2900, Pearce-Simpson Super Panther, RCA 14T302, Truetone CYJ4837A-87, Universe 5600: A wire marked “C” runs from the secondary terminal of T10 not going to C111/R88, to a foil pad containing one end of C122 and D12, near T13. Cut this wire and install the CG in series. (IN = T10 end, OUT = C122/D12 end.) Dak Mark X only: Cut gray shielded cable connecting T10/C121 to CFl/D12. Install CG in series. (IN = T10/C121, OUT = CF1/D12) Cybernet PLL02A American, PTBM080/085COX & PTRF004/005DOX G.E. 3-5875A Superbase, Midland 78-574, 78-999, SBE LCBS-4: Remove C279 on RF board. (IN = Q210/T207, 0UT = T208.) Cybernet PLL02A Export, PTBM059COX & PTOS006 or PTSY016AOX Ham Int’l Concorde, Jumbo, Multimode II, HyGain V, Lafayette 1200FM, Major M360, M588: A wire marked “C” runs from the secondary terminal of T10 not going to C111/R88, to a foil pad containing one end of C122 and D12 on the main PTBM059 board, near T13. Cut this wire and install the CG in series. (IN = T10 end, OUT = C122/D12 end.) Cybernet PLL02A Export, PTBM121D4X, PTBM121COX Cobra GTL150, Colt 320DX, 320FM, 1200DX (Excalibur), Ham Int’l Concorde II, HyGain 2795DX, Intek 1200FM, Lafayette HB70AFS,Tristar 747: A wire marked “H” runs from one secondary terminal of T12 (the terminal not going to C116/R90) to the pad marked “I” next to T13 (that contains one end of C120/D14). Remove wire from “I.” (IN = wire from T12, OUT = “I.” (C120/D14 junction next to T13.) Cybernet PLL02A Export, PTBM125A4X or PTBM131A4X Colt 1600DX, 2000DX, HyGain 8795 (V), Lafayette 1800, Midlannd 7001 export, Pacific 160, Superstar 2000, Tristar 777: Remove C120. (IN = T11/Q19, OUT = T12.) Cybernet PLL02A Export, PTBM133A4X: Ham Int’l Concorde III, Jumbo III, Multimode III. Remove C117. (IN = T11/R96, OUT = T12.) Cybernet PLL02A Export, PCMA001S Argus 5000, Colt 2400, Cobra 148GTL-DX (fake), Falcon 2000, Lafayette 2400FM, Mongoose 2000, Nato 2000, Palomar 2400, 5000, Starfire DX,Superstar 2200, Thunder 2000, Tristar 797, Tristar 848: Remove C120. (IN = T11/Q19, OUT = T12.) Early Uniden µPD2824 PLL SSB Chassis (10.695 MHz IF, PC833, PC965) Cobra 146GTL, Midland 6001/7001 late, 79-260, Pearce-Simpson Super Cheetah, President P300, AR144, AX144, Realistic TRC451,Sears 663.3810, Uniden PC244: Remove C46. (IN = L6, OUT = L7/C47.) Late Uniden µPD2824 SSB Chassis (PB062, PB105, PB122) Realistic TRC453, TRC465, TRC850, Uniden PC122, PC122XL, PRO-640e, PRO-810e: Remove C40. (IN = L8, OUT = R58/D12.) Uniden Multimode Export w/MC145106 PLL, PB010 chassis Cobra 148GTL-DX (late), President Richard, Superstar 360FM: Remove C61. (IN = L11, OUT = L12/C62.) Uniden Multimode Export w/MC145106 PLL, PB042 chassis President Jackson: Remove R74 (470W). (IN = FT4/C16/C17, OUT = R75/TRI3.) Uniden "clone" Multimode Export w/MC145106 PLL, EPT00JA-10Z chassis Superstar Jackson: Remove R74 (470W). (IN = FT4/C16/C17, OUT = R75/TRI3.) Uniden Multimode Export w/MC145106 PLL, PC879 chassis Cobra 148GTL-DX (early): Remove C48. (IN = L6, OUT = L7/C49.) Uniden Multimode Export w/MC145106 PLL, PC893 chassis Stalker 9-FDX, President McKinley export: Remove C57. (IN = L10, OUT = L11/C58.) Uniden Multimode Export w/MC145106 PLL, PC999 chassis President Grant Export: Remove C61. (IN = L11, OUT = L12/C62.) Uniden “clone” multimode copycat models using MC145106 PLL and with EPT3600-10A, -10Z, -11A, 11Z, -13B, -14B or similar Ranger-type chassis. NOTE: If in doubt about your specific chassis, check the other AM/FM “clone” listings below or send us the exact chassis details. Cherokee CBS2100, NR100, NR150, Connex 3300, 3500, Dirland 3300, 3500, 3600, 3700, 3900, Eagle 2000, Excalibur (base), Excalibur Samurai, Galaxy 11B, Galaxy 2100, Galaxy II, Galaxy DX33, DX44, DX55, DX66, DX73V, DX77, DX88, DX99, Galaxy Jupiter, Galaxy Melaka, Galaxy Pluto, Galaxy Saturn, Galaxy Sirius, General Lee, Mirage 44, Mirage 6600, Mirage 88, Mirage 9900, Mirage II, Mirage III, Northstar 3000, 4000, 6000, 9000, 9500, President Franklin, Super Galaxy, Superstar Grant, Superstar 3300, 3500, 3600, 3900: Remove C58. (IN = L10, OUT = L11/C59.) European-made version of Uniden "clone" chassis above (same circuit, different part numbers) Euro 3900: Remove C64. (IN = L9, OUT = L11/C65.) Early Uniden “Clone” AM/FM fakes w/MC145106 PLL & EPT3000-10A chassis Dirland/Superstar 3000: Remove C53. (IN = L9, OUT = L10/C54.) Early Uniden “Clone” AM/FM fakes w/MC145106 PLL & EPTMARS-10Z chassis Dirland/Superstar 3500: Best-remove C38. (IN = L6, OUT = Q8/C39/R22.) Also possible but not as effective: replace FL1 (IN = L7, OUT = R26/R27/Q9.) Miscellaneous Newer CB or 10-Meter AM/FM/SSB Chassis NOTE: Increasingly many newer 10M & “export” type multimode/multiband radios are now built using only Surface-Mount Devices (SMD), including the main chassis. Components and spacings are tiny! You'll need a magnifying glass, special miniature solder iron, etc. It’s not practical to use the CG in those models unless you’re an experienced pro with all the right tools and know exactly how to do it. (SMD models noted here where known.)} Cherokee CBS-1000: Remove C32. (IN = L33, OUT = L34.) Cobra 148FGTL-DX+, Connex 4400, 4800, Galaxy DX43T, DX93T, DX2517, General Grant, Ranger 99, RCI2960, RCI2980WX, RCI6300, & others w/EPT6900 main PCB: Remove C61.(IN = L8, OUT = L9/C62.) Galaxy DX949, DX959, DX2547, Texas Ranger 396, 399, 696, 699, “900” series & others w/EPT0696 main PCB: Remove C61. (IN = L8, OUT = L9/C62.) Courier Galaxy IV: Remove C30. (IN = T7, OUT= D10/R31.) Courier Galaxy V, VI: Remove C58. (IN = L10, OUT = L11/C59.) Eagle 5000, Galaxy Saturn Turbo, DX-2527, older RCI2950, 2970, 2980, 2990, Sommerkamp TS-2000DX w/EPT2950 main PCB: Remove C72. (IN = L12, OUT = L13/C73.) Emperor TS-5010: Remove C115. (IN = L104, OUT = R304.) G.E. 3-5826A: Remove C55. (IN = T7, OUT = T9.) Magnum 257, 357, 457, Titan II, RPSY-485, ProStar 400, Superstar 4900*: Remove C87. (IN = T8/Q8/R14, OUT = T7) Magnum Delta Force*: Remove C187. (IN = L112/C117, OUT = D124/R204/R206. *NOTE: This is for SSB only; no way to install CG to include AM and FM modes without defeating the Noise Blanker. For AM/FM you can also install our 455 KHz filter in place of the existing 455 "FL101". (IN = Q112/R123, OUT = R124/R136/D107. Midland 79-265: Remove C30. (IN = T7, OUT = R31/D10.) Midland 79-290: Remove C57. (IN = T4, OUT = Q19/R69.) Radio Shack HTX-100: Remove C43. (IN = L5, OUT = R56/D14.) Radio Shack TRC485: Remove C32. (IN = T4/Q4, OUT = T5.) Ranger AR3300, 3500: Remove C24. (IN = R21/C416, OUT = R20/D8.) RCI2950DX, 2970DX, 2985DX, 2990DX, 2995DX w/EPT6950 main PCB: Remove C68. (IN = L8, OUT = L9/C69). WARNING: This has an SMD main chassis; leave this installation to a pro! RCI6900 w/EPT9900 main PCB: Remove C68. (IN = L8, OUT = L9/C69). WARNING: This has an SMD main chassis; leave this installation to a pro! Superstar 4900B: Remove C69. (IN = T204, OUT = T205). Uniden HR2510, 2830, President Lincoln: Remove C15. (IN = L115, OUT = D105/R9.) C15 is between L115 and SSB filter FT102. Bend leads 90° and install on foil side of PCB; criss-cross the IN/OUT leads and use the sleeving insulation provided. Put some insulating tape between filter and radio PCB. Uniden HR2600: same as HR2510 above, except IN = L4, OUT = R9/D5. * CAUTION! HIGH VOLTAGES ARE LETHAL! * If you have the slightest doubts about installing the CHANNEL GUARD in a high-voltage, tube type transceiver, let a qualified tech do it. Hope this helps. Lon Tech808   Tech808 Moderator Username: Tech808 Post Number: 2940 Registered: 8-2002 Posted on Tuesday, July 13, 2004 - 6:55 am:        7.8 MHz AM/SSB HOOKUP LIST BY PLL CHASSIS TYPE µPD858 PLL (early Uniden SSB chassis) Courier Gladiator PLL, Spartan PLL, Fanon Fanfare 350F, Midland 79-893: Remove C49. (IN = T5, OUT = R50/D20) Cobra 138XLR, Palomar SSB500 early, Realistic TRC449, Robyn SB510D, Teaberry Stalker 101, 102: Remove C20. (IN = L5, OUT = R19/D4/C21.) NOTE: Foreign mobile models like Stag 357 (LC7120 PLL), Palomar SSB500 late (MC145106 PLL), or WKS1001 (MC145106) are otherwise identical to Cobra 138XLR above. Remove C20, same as above. Cobra 139XLR, President Adams, old Grant, old Madison, old Washington, Realistic TRC457/TRC458, Robyn SB520D, Teaberry Stalker 202: Replace existing monolithic filter “FT2” for best results. (IN = L5, OUT = L6.) Courier Centurion PLL, Centurion 40D: Remove C22. (IN = L5, OUT = C23/R19/D5.) MB87l9/MB8734 PLL (late Uniden single-conversion SSB chassis. PC385, PC511, PC622, etc.) Cobra 140GTL, 142GTL, Courier Galaxy, President McKinley, Washington (late), P400, Realistic TRC450/TRC490, Robyn SB505D, SBE LCBS-8,LCMS-8, early Superstar 360, Teaberry Stalker IX, XV, XX, Tram D80/D300, Uniden Washington: Remove C42. (IN = L7, OUT = L6/C44.) Midland 79-900: Remove C43. (IN = L8, OUT = L7.) MB8719/MB8734 PLL (late Uniden dual-conversion SSB chassis) Cobra 148GTL, 148GTL-F, 2000GTL, 2010GTL-WX, Pearce-Simpson Super Bengal Mk II, President Grant (late), Madison (late), Stalker XX export, Uniden Grant, Grant LT, Grant XL, Madison: Remove C47. (IN = L7, OUT = L8.) RCI-8719 PLL (made by Ranger, exact clone of 148GTL. PCB = EPT0148-11Z, -13Z) Texas Ranger 296: Remove C47. (IN = L7, OUT = L8.) µPD2824 PLL SSB chassis (early Uniden 7.8 MHz IF, PC582, PC585, PC621 Craig L132, L232, Wards GEN-719A: Remove C45. (IN = L7, OUT = L6/C49.) Early NDC40013 PLL SSB Chassis SBE Console V, Sidebander IV, Sidebander V: Remove C118. (IN = C115/Q103, OUT = T104.) Late NDC40013 PLL SSB Chassis Craig L131, L231: Remove C212. (IN = T203, OUT = Q204/R208.) Johnson Viking 4740, Viking 352D: Remove C415. (IN = T404, OUT = Q404/R411.) Johnson Messenger 4730: Remove C417. (IN = Q404/C415, OUT = L402/CR405.) Pace 1000BC, 1000MC: Remove C314. (IN = T308, OUT = R343/CR303/R342/C315.) NDI PC200, PC201, Tram D64: Remove C326. (IN = T305, OUT = Q305/R317.) SBE Console VI: Remove C118. (IN = Q103, OUT = T105.) Toshiba TC5080/81/82 PLL SSB Chassis Browning Baron, Cobra 132/135XLR, Tram D62: Remove C28. (IN = Q5/R31/R32, OUT = Q6/R33.) NOTE: Watch excessive gain here; there are already several preceding IF amp stages. Miscellaneous PLL SSB Chassis Realistic TRC459: Remove C75. (IN = T10/C82, OUT = Q21/R83.) Realistic TRC480: Remove C83. (IN = T10/TP6, OUT = Q22/R84.) Miscellaneous 23-Channel Crystal Synthesizer SSB Chassis NOTE: In most cases these are for AM improvement only, because there’s no common mode coupling capacitor. Some do have a separate SSB capacitor; send SASE for details if that’s what you prefer. These were all dynamite rigs in their day! Browning LTD, Cobra 132A: Remove C55. (IN = Q9/T10/IC2, OUT = T11.) Cobra 130: Remove C305. (IN = Q2/T3/C108, OUT = T8.) Cobra 132/135: Remove C85. (IN = Q11/T10/U4, OUT = T11.) Cobra 138/139, Midland 13-893, 13-895: Remove C11. (IN = T4, OUT = D2/R9.) Courier Centurion, Gladiator: Remove C219. (IN = T9/C60, OUT = T12.) Courier Spartan: Remove C21. (IN = D15/R32/C46, OUT = T5.) Midland 13-893, 13-895: Remove C11. (IN = T4, OUT = D2/R9.) Pace Sidetalk 1000B/1000M, Tram XL-5: Remove C313. (IN = R314/CR304/CR305, OUT = FL301.) Pearce-Simpson Bengal: Remove C10. (IN = D15/R39/C46, OUT = T1.) Pearce-Simpson Cheetah: Remove C98. (IN = D10/R33/C69, OUT = T11.) Pearce-Simpson Panther: Remove C21. (IN = D15/R32/C46, OUT = T5.) Pearce-Simpson Simba: Remove C219. (IN = D11/R29/C65, OUT = T12.) SBE 12CB (Sidebander II), 16CB (Console II): For SSB only, remove C140 (IN = T4, OUT = T6). For AM only, remove C145. (IN = R148/C132/T5, OUT = D20/D21.) NOTE: No combo AM/SSB installation possible in above SBE models without defeating the Noise Blanker! SBE 18CB (Sidebander III): Remove C120 (IN = D9/R113/D4, OUT = FL1.) Tram D60: Remove C57. (IN = Q10/T10/IC2, OUT = T11.) Tram XL-5: Remove C313. (IN = R314/CR304/CR305, OUT = FL301.) * CAUTION! HIGH VOLTAGES ARE LETHAL! * If you have the slightest doubts about installing the CHANNEL GUARD in a high-voltage, tube type transceiver, let a qualified tech do it. Hope this helps. Lon Tech808   Airplane1 Intermediate Member Username: Airplane1 Post Number: 156 Registered: 5-2004 Posted on Wednesday, September 15, 2004 - 12:25 pm:        I dont know what board my uniden grant XL has. How do I find out?   Bruce Senior Member Username: Bruce Post Number: 1578 Registered: 9-2003 Posted on Wednesday, September 15, 2004 - 3:21 pm:        email me ill help you wa4gch@yahoo.com   Junkbarren Junior Member Username: Junkbarren Post Number: 44 Registered: 3-2002 Posted on Thursday, October 28, 2004 - 7:06 am:        i have a magnum 257. the receive picks up everything, even with the nb-anl on. it is not as bad, but leaves alot. i'm talking about streetlights,electric motors,electric fences,other vehicle ignition etc. in town it is very bad. i love everything about this radio ,except this noise. is a channelguard needed or is there there something needed to be done with the nb-anl to beef it up? i already have a filter on the power wires. i hope someone can help. i really want to keep this radio. also i noticed ssb is fairly clean. this is mostly an am problem.   Bruce Senior Member Username: Bruce Post Number: 1717 Registered: 9-2003 Posted on Thursday, October 28, 2004 - 9:13 am:        those noises are a problem with most radios The channelguard will narrow the recever band width but probley not do much for the noise . If i remember right the NB / NL works fairly well. Now DSP may help but external DSP boxes are not cheap. I run several HTX-10's the HAM ONLY ver of the 257 and they are great radios. Noise problems are the REASON FM is so widely use today.   Junkbarren Junior Member Username: Junkbarren Post Number: 45 Registered: 3-2002 Posted on Thursday, October 28, 2004 - 4:21 pm:        thanks bruce. i have had several radios that were less noisey that this 257. i've had some noisier, but they were cheap 30 buck specials. with the nb-anl off, the noise is unbarable. what is a dsp, that you mentioned above? how much is not cheap? you were right the nb-anl does work well, but the amount of noise to begin with is so much, that i figured it just couldn't handle it.   Patzerozero Intermediate Member Username: Patzerozero Post Number: 406 Registered: 7-2004 Posted on Thursday, February 03, 2005 - 5:18 pm:        bruce, lon or anybody-will channel guard work with magnum S9, has 3 filters in it. if it will work, would i use 10.695, or would i need that & 455 like my delta force? also, what about 1674 to 2999 receive transistor swap in S9? there is a 1674 at both the 455 & 10.695-would they both have to be changed?   Tech808 Moderator Username: Tech808 Post Number: 4735 Registered: 8-2002 Posted on Thursday, February 03, 2005 - 5:45 pm:        Patzerozero, I WOULD say NO. Was Just talking with Sam Lewis when you posted and he said NO WAY about adding anything to it or your Warranty is VOID. And with the Great Warranty on the S-9 I would do NOTHING to it to void it. WHY? Because if you get the extended warranty for the Next 3 years if you have any problems with it and send it in for repair you get ALL of the Updates for it for FREE! Just my personal thoughts, Lon Tech808 CEF808 N9OSN   Rfmister Junior Member Username: Rfmister Post Number: 15 Registered: 10-2004 Posted on Thursday, February 03, 2005 - 8:19 pm:        Yes the channel guard would be a great improvement to the recieve of the S-9. I would say just the 10.695 would need to be changed, but it would be hard to say without a little studying   Bruce Senior Member Username: Bruce Post Number: 2173 Registered: 9-2003 Posted on Friday, February 04, 2005 - 7:29 am:        The RF AMP 2sc1674 would be the one to change how ever lon is correct untill it's out of warranty best to leave it alone. Now channelguards its not going to be easy c87 just past T8 would be the place to drop it in however it's not going to work on am/fm ... and keep in mind SMT parts ....bummer.   Patzerozero Intermediate Member Username: Patzerozero Post Number: 412 Registered: 7-2004 Posted on Friday, February 04, 2005 - 6:26 pm:        thanks, guys. i am working on prying an S9 from somebody who doesn't like his-too much $, feels his galaxy is better, etc, etc. who am i to argue? if i can get it cheap enough, & it's already been opened & messed with to the point where it needs a realignment, hey, what better starting point to see what can be done to one. if i get that one, i'll investigate farther.   Hollowpoint445 Advanced Member Username: Hollowpoint445 Post Number: 943 Registered: 6-2004 Posted on Saturday, December 03, 2005 - 6:40 pm:        FYI - Lou Franklin is no longer making the 455 kHz or 7.8 MHz Channel Guard Filters. Only the 10.695 MHz filter is available now. He does say that he'll sell a Channel Guard Board minus the crystals so you can make your own 7.8 MHz or 455kHz filter, but you have to hunt down the crystals yourself with the specific information that he provides.   Rldrake Junior Member Username: Rldrake Post Number: 30 Registered: 1-2006 Posted on Wednesday, January 18, 2006 - 3:05 am:        "Channel Guard" is a registered trade mark belonging to the General Electric Corporation and its subsidiaries. It is their name for their CTCSS (Continuous Tone Coded Squelch System) used on their commercial land mobile radio systems (analog subaudible tone). The manufacturer of this "board" had better hope that General Electric, and its legal departments, do not as agressively protect their trademarks, as does Motorola with such things as their radio programming software and their "PL" and "Private Line" trademarks, Motorola's trademark for their version of CTCSS used on their commercial land mobile service radios. If anyone here knows the people making the "board" that is the subject of this topic would be doing them a big favor by advising them to look into this trademark thing more closely...before it gains any attention at G.E.   Hollowpoint445 Senior Member Username: Hollowpoint445 Post Number: 1019 Registered: 6-2004 Posted on Wednesday, January 18, 2006 - 6:37 am:        It's been marketed for a long time. I think if GE was upset, they'd have done something by now.   Im4jc Member Username: Im4jc Post Number: 60 Registered: 11-2005 Posted on Sunday, January 22, 2006 - 2:43 am:        Somebody needs to take it down a notch. Valium may be helpful.   Mayor513 Member Username: Mayor513 Post Number: 58 Registered: 3-2002 Posted on Saturday, April 01, 2006 - 2:59 pm:        --Hi, all. I just got in my 7.8Mhz Channel Guard today and need some help. I will be installing it into my General Sherman (I am using the Texas Ranger TR-296 installation instructions because it's basically the same radio.) --From what I gather, all I have to do is to find a good ground, 13.8VDC, and then install the in/out leads into the removed capacitor slot "C47" right? That sounds easy enough, but I cannot find C47. Also, what are the instructions talking about when it reads to "Remove C47. (IN=L7, OUT=L8)"? Do I put the In/Out lead in the C47 holes OR near the L7 and L8 cans??? I don't know what to do. It seemed like an easy enough installation, four wires, ya know. However, I am now reading SIX different places to hook up wires...1. Ground, 2. DC voltage source, 3,4-C47 capacitor holes, 5 L7, and 6. L8. Thanks for any help.   Mayor513 Member Username: Mayor513 Post Number: 59 Registered: 3-2002 Posted on Saturday, April 01, 2006 - 5:15 pm:        --Okay, never mind. I found C47, it was sort of hidden between two of those square cans, haha. I have it installed. It seems to be rejecting bleedover pretty good, but the real test will be tonight.   Hollowpoint445 Senior Member Username: Hollowpoint445 Post Number: 1151 Registered: 6-2004 Posted on Saturday, April 01, 2006 - 6:30 pm:        I think you figured it out, but just in case you didn't, the in lead goes in the C47 hole next to L7 and the out lead goes to the C47 hole next to L8. Where did you find one?   Tech808 Moderator Username: Tech808 Post Number: 9629 Registered: 8-2002 Posted on Saturday, April 01, 2006 - 6:43 pm:        Maybe Copper Electronics? Channel Guard Filters 10.695 MHZ Lon Tech808 CEF808 N9CEF CVC#2   Hollowpoint445 Senior Member Username: Hollowpoint445 Post Number: 1152 Registered: 6-2004 Posted on Saturday, April 01, 2006 - 6:57 pm:        I don't think so Lon. "-Hi, all. I just got in my 7.8Mhz Channel Guard today" http://www.copperelectronics.com/cgi-bin/checkitout/checkitout.cgi?catalogSTORE:CKIE:prodBKS-02002+ BKS-02002 Channel Guard Filters 7.8 MHZ $ 29.99 This Item Is No Longer Available   Tech808 Moderator Username: Tech808 Post Number: 9631 Registered: 8-2002 Posted on Saturday, April 01, 2006 - 7:36 pm:        Maybe he bought the last one Copper Had? Lon Tech808 CEF808 N9CEF CVC#2   Mayor513 Member Username: Mayor513 Post Number: 60 Registered: 3-2002 Posted on Saturday, April 01, 2006 - 8:25 pm:        Here is what the circuit board looked like in my General Sherman. It's a horrible "drawing" but basically, the capacitor legs were the two "dots" you see between the L7 and L8 "cans"...in my radio, the left leg of the capacitor was NOT in the direction of L7, and the right leg of the capacitor was not towards L8. Regardless, when the truck drivers start coming through tomorrow night, that will be the ultimate test, but so far, it works great. ------' L7 ------' . . C47 ------' L8 ------' P.S. In the Preview/Post Message thingy, it doesn't show my drawing the way I drew it, but maybe you will see what I mean.   Hollowpoint445 Senior Member Username: Hollowpoint445 Post Number: 1156 Registered: 6-2004 Posted on Sunday, April 02, 2006 - 12:35 pm:        Mayor513 - I've never installed one backwards on purpose, but I think if your receiver is working at all, you guessed right on the in/out holes. If you really want to make sure you can look at the board traces on the opposite side and easily see to which components the holes are connected.   Hollowpoint445 Senior Member Username: Hollowpoint445 Post Number: 1157 Registered: 6-2004 Posted on Sunday, April 02, 2006 - 12:56 pm:        It appears that Lou Franklin has decided to keep selling the 7.8MHz Channel Guard filters. His website has been updated to reflect this change. Will Copper again stock them?   Patzerozero Senior Member Username: Patzerozero Post Number: 2665 Registered: 7-2004 Posted on Sunday, April 02, 2006 - 4:57 pm:        i had emailed a while back, & apparently they weren't building ANY more channel guards, & hadn't for some time. the 455's were discontinued a while back because the supply had been exhausted, then the same happened to the 7.8's. i DO hope he reconsidered & will continue with them.   Mayor513 Member Username: Mayor513 Post Number: 61 Registered: 3-2002 Posted on Sunday, April 02, 2006 - 4:58 pm:        --I might take out the Channel Guard until I find out how I might have installed it incorrectly. I have another General Sherman that I compared the receive on, and for some reason, the NB/ANL portion doesn't seem to cut the noise like it used to. On the General Sherman, it has the Off, ANL, NB/ANL. The OFF and the ANL work like they should, but now, the NB/ANL does not seem to do anything. Oh, well.   Bruce Senior Member Username: Bruce Post Number: 3720 Registered: 9-2003 Posted on Sunday, April 02, 2006 - 7:50 pm:        "I have another General Sherman that I compared the receive on, and for some reason, the NB/ANL portion doesn't seem to cut the noise like it used to" TRUE on some sets it does interfere with the NB   D1g1man New member Username: D1g1man Post Number: 2 Registered: 3-2008 Posted on Wednesday, March 12, 2008 - 10:03 pm:        I have Sommerkamp TS-2000DX: (RCI-2950) Can anyone share their results of this mod? Did it kill your Noise Blanker? Was it worth it? Does anyone have the schematic for this? (pre-purchase questions) Thank you very much!