[Repeater-Builder] "Rusty bolt" help!!
We have a 145 Mhz 600khz split repeater running 25 Watts output up LDF 450 coax to a three element commercial beam at 25 Metres above ground mounted on a metal 35 Meter tower,,, We are trying to identify the problem of what could be a "Rusty Bolt effect" the effect is that it will wipe out a signal on the input of all but the very very strong signals it sounds just like a heavy crunching soundit does not become worse with rain, wind,cold,or heat,we have changed the Tx/Rx set up, and changed the Wacom Duplexer..added extra bandpass filters We have another beam 3 Meters below, run the system on this with the same effect, have run the repeater with two antennas and extra filtering, also the effect is present with only 1 watt of RF output one other effect the noise can be heard on the Tx carrier ie no through audio,, To investigate the mast will cost money for an insured rigger,,, idea's where or what to try next would be greatfully recieved,, rgds Fraser YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] "Rusty bolt" help!!
Hi Kevin Yes read the text the only problem I had with this is that is says will only occur with the squelch open ours is there open or closed,, FraserKevin Custer <[EMAIL PROTECTED]> wrote: Did you read this?KevinFraser Stuart wrote: We have a 145 Mhz 600khz split repeater running 25 Watts output up LDF 450 coax to a three element commercial beam at 25 Metres above ground mounted on a metal 35 Meter tower,,, We are trying to identify the problem of what could be a "Rusty Bolt effect" the effect is that it will wipe out a signal on the input of all but the very very strong signals it sounds just like a heavy crunching soundit does not become worse with rain, wind,cold,or heat,we have changed the Tx/Rx set up, and changed the Wacom Duplexer..added extra bandpass filters We have another beam 3 Meters below, run the system on this with the same effect, have run the repeater with two antennas and extra filtering, also the effect is present with only 1 watt of RF output one other effect the noise can be heard on the Tx carrier ie no through audio,, To investigate the mast will cost money for an insured rigger,,, idea's where or what to try next would be greatfully recieved,, rgds Fraser No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.11/264 - Release Date: 2/17/2006 YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: "Rusty bolt" help!!
Hi SkippWe did try another Transmitter and at 25 and with no change also ran a isolator no change we did run 1 watt and the grunge was reducedthere are three other VHF (166-174Mz)systems on site running 25 Watts Fraserskipp025 <[EMAIL PROTECTED]> wrote: For an easy test that will tell you a lot, try a substitute transmitter. Does a different transmitter do the same grunge? Disable and remove your main transmitter and pa from the coax path. Use a temp mobile or an equiv for testing. Tx on the main repeater tx frequency with the sub transmitter and listen for the grunge. You said you changed out the duplexers and tried a different antenna. The only thing I didn't see swapped was the transmitter, PA and receiver. I would first try swapping out the transmitter side. Do you have a circulator/isolator in line? If you were able to measure the grunge on the receiver side, you could then reduce the tx power to 1 watt or something easy to deal with. Then place a high power pad (attenuator) in series between the tx equipment and the duplexer to measure any change in the grunge with the added pad. skipp > Fraser Stuart <[EMAIL PROTECTED]>wrote:>> We have a 145 Mhz 600khz split repeater running 25 Watts output upLDF 450 coax to a three element commercial beam at 25 Metres aboveground mounted on a metal 35 Meter tower,,,> We are trying to identify the problem of what could be a "RustyBolt effect" the effect is that it will wipe out a signal on the inputof all but the very very strong signals it sounds just like a heavycrunching soundit does not become worse with rain, wind,cold,orheat,we have changed the Tx/Rx set up, and changed the WacomDuplexer..added extra bandpass filters> > We have another beam 3 Meters below, run the system on this withthe same effect, have run the repeater with two antennas and extrafiltering, also the effect is present with only 1 watt of RF output> > one other effect the noise can be heard on the Tx carrier ie nothrough audio,,> > To investigate the mast will cost money for an insured rigger,,,> > idea's where or what to try next would be greatfully recieved,,> > rgds Fraser>Yahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Re: Wacom filters service
Hi Skipp,,,Brilliant just what I was looking for someone who has the "T" shirt was involved with some of the first UK ham repeaters back in the later 70's now getting back into them,,,and yes have loads of test equipment etc,,,and hopfully the knowledge to use them,,,once again many thanks,, Fraserskipp025 <[EMAIL PROTECTED]> wrote: Hopefully you have the instruments to align the cavities. Clean any visible threaded shafts and mechanical parts with a small (wood handle type) Stainless Steel or Brass Brush.Use a combination of clean lint free rags and a non residue leaving lubricant to lightly free up the mechanical parts. Amsoil MP Synthetic Spray is a good choice for some places(and it's cheap to buy). Measure and record the relative shaft lengths and any available adjustments. I made up a drill chuck/clamp for the tune rod. After the above steps, I slowly run the tuning rods up and down almost the entire range of the plunger assembly. Using a Makita hand drill and many others with a very light torque release setting will ensure you don't damage the mechanics. Running the plunger cap up and down a few times will help remove oxide buildup and pitting. High power RF, nearby lighting (and direct) can cause serious plunger/cap pitting, especially with/during small mechanincal vibrations. More so from inexperienced high power duplexer tuning.Those who use the rf power alignment duplexer tune method are advised to use very low power for the initial coarse adjustments. Put the duplexer adjustment back in range, adjust with your test equipment and see if the noise goes away. Be sure to check the coax jumper and connectors for proper assembly. A very light coat of Caig Labs ProGold G5 on a rag can be wipped over the connector ends. Plunger pitting is a very common noise source. Bad cases from lightning strikes and "Boob Tuning" may not be easily fixed ... in such cases you can only use the cavity at other frequencies where the adjustments don't place the damaged plunger/body mechanics at the same location. Been there, done that, coffee mug and tee shirt. cheers,skipp > "fraser3914" <[EMAIL PROTECTED]>wrote:> Hello all,,,I need to strip down and service > a set of four Wacom 145mhz filters for our local > 2m box has anyone any advice before I start> after 15 years use the adjusters have become noisy etc,> > Rgds Fraser G8FEZYahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] Vari Notch
Hi I am after information on constructing a Vari Notch coupling loop for 145Mhz to be placed in a cavity they claim superior notch any ideas please, Fraser G8FEZ Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Help with Wacom WP-639 Duplexer
Hi Bob Re filters if you want a hand give me a call,, rgds Fraser G8FEZ (in the book)m1ror <[EMAIL PROTECTED]> wrote: Hello AllThis is my second posting but I'm not sure if my first attempt made it to the list.I bought a set of what appear to be good condition Wacom WP-639 (144-174Mhz) Duplexers originally tuned for 156Mhz. A friend has attempted to align the filters but is having problem aligning the notch down to 145Mhz.The problem he tells me is he can only get the notch down to 148Mhz with the Invar rods pushed all the way in. He has made up new patching loom and still the same result.Has any body played with these and could offer any advice?Bob G6CKKYahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] Decibel DB4632-1A Isolator tuning
Hi I have a DB4632-1A Isolator which is currently tuned to 456.2Mhz my question is will this tune down to 434.0Mhz I have the test gear to do this,, but thought I would ask before wasting lots of time Rgds Fraser YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
