Re: [Repeater-Builder] Low Repeater output at site only
Thanks Scott. Just during the Christmas holiday season, one of our members who just moved to El Paso said that the clubs there have had bad luck with the Mark IV also, and all have gone to a Micor or something similar. Since we purchased the Mark IV in '99, the company has changed hands, and they want $400 minimum for any Mark IV repair. The local commercial radio company that takes care of the city, fire, police, etc has Kenwood repeaters but I don't think they go down to our frequency, 144.79/145.39. For now the old Icom is working. Thanks Scott.. 73, Mike K9MI - Original Message - From: Scott Zimmerman To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 20:10 Subject: Re: [Repeater-Builder] Low Repeater output at site only Mike, I would strongly suspect the Mark IV is having problems. My experience with those repeaters has NOT been good. They seem to be VERY spooky. Especially when it comes to high RF environments. Most of these units were fine when they were first produced, but as the components age, they are becoming increasingly more problematic. Our local club had one since the early 80's. They dumped it in favor of a Micor conversion about 7 years ago and haven't looked back. Another local club still has theirs on the air. About the time our club got rid of ours, they decided to re-build theirs. Many hours and capacitors later, they had it working OK. Now, it's so deaf you have to run 50W 5 miles from the site to make an S5! If I were to hazard a guess at what your problem might be, I would guess it might be 2 things: 1. The PA drive control circuitry is interpreting the high RF at the site coming back down from the antenna to be reflected power and shutting the power amp down to keep from blowing it up. -- OR-- 2. The transmitter is spurring and the drive control is doing what it is supposed to do and shutting the transmitter back to keep from blowing it up. Do this: If you connect a dummy load and wattmeter to the duplexers instead of the antenna. Connect a wattmeter between the Tx and the duplexer . How many watts are coming from the Tx and how many watts do you have into the dummy load? Your duplexer loss should be less than 1/3. In other words if you have 30W from the PA, you should have more than 20W coming out of the duplexers into the dummy load. If not, you have duplexer trouble, or a spurious transmitter. I would then look at the transmitter on a spectrum analyzer and see how much 'grass' you are growing. Good luck, Scott Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 - Original Message - From: k9mi [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 2:29 PM Subject: [Repeater-Builder] Low Repeater output at site only Sorry, this isn't actually a repeater-builder question, but it is a repeater problem, and this is where I thought I could get the best info for the problem. We have a Mark IV that has worked well for 9 years. It's really still working well, but here is what is going on. With a Bird watt meter, the Mark IV shows 3 watts out. If another member of the club, using the same meter and a dummy load, shows 32 watts (usual for the Mark IV). We also have a backup repeater, and Icom IC-RP1510 that has always had an output of 18 watts, and still does. It shows 18 watts out, 1 reflected, same as it always has. These output readings are before the duplexers (Wacom 641). The mystery is the Mark IV works fine into a dummy load, but not at the site. The Icom works the same as always. The a/c voltage (this is at a hospital) is 124 volts. It is a multi-transmitter site, and the MFJ analyzer shows our DB 224 as pegged on the swr, then it will drop briefly to a low SWR, and then go back up for a couple of minutes, and then drop again . I think the MFJ analyzer is just getting RF'ed from another transmitter, and that the Bird is much more reliable under these circumstances. The Icom with 18 watts out, 1 reflected leads me to believe the system is fine, but why would the Mark IV have an output of 3 watts into the Bird watt meter (nothing reflected), but into a dummy load, the Mark IV behaves as it should. My only other thoughts on testing would be to take a 50 watt 2m rig/ps and a different Vswr/wattmeter up and see how it behaves with the system. Any help/ideas would be appreciated. Tnx... 73, Mike K9MI [EMAIL PROTECTED] Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.5/1228 - Release Date: 1/16/2008 9:01 AM
Re: [Repeater-Builder] Low Repeater output at site only
At 02:15 PM 01/16/08, you wrote: (big chunk cut out) The local commercial radio company that takes care of the city, fire, police, etc has Kenwood repeaters but I don't think they go down to our frequency, 144.79/145.39. For now the old Icom is working. Thanks Scott.. 73, Mike K9MI Kenwood repeaters come in two ranges - the so called K1 version is for 146-174 MHz, while the K2 version is for 136-150 MHz. These are RF hardware design limits, the K1 version does not perform well in the 144-146 MHz portion of the 2m band and cannot be stretched to get there. I tell any ham group to buy a K2 version even if their frequency is in the 147 range as the resale value will be higher. If you find a second hand one, make sure the unit is a K2, it has to say so on the label. There are a number of Kenwood dealers on this list, any one of them can set you up with a unit pre-programmed for your pair. I suggest that you let them pop up and state that they are a dealer, and then contact them via email. Note that the built-in controller in the early Kenwoods (i.e. the 720 models) is pretty brain-dead and does not meet amateur requirements. Those that use those models just set them up as duplex base stations and use an external controller. Mike WA6ILQ
[Repeater-Builder] ID-O-Matic and T800 unit
Hi all, Has anyone interfaced an ID-O-Matic CW IDer to a TAIT T800 repeater? I have the kit ready, but I need instructions for dummies on how to connect it :-) If possible, I'd like to make it polite i.e. transmit the ID every 10 minutes or when the repeater is activated after some time of inactivity, but not while the repeater is being used. 73, Andreas - 5B8AP -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.5/1228 - Release Date: 16/1/2008 9:01 ðì Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * 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/
Re: [Repeater-Builder] Low Repeater output at site only
Mike, Realize that here at Repeater-Builder (the company) we build such Micor and MII repeaters. Let me know if you would like me to work up a quote for you. Scott Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 - Original Message - From: Michael Brown To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 5:15 PM Subject: Re: [Repeater-Builder] Low Repeater output at site only Thanks Scott. Just during the Christmas holiday season, one of our members who just moved to El Paso said that the clubs there have had bad luck with the Mark IV also, and all have gone to a Micor or something similar. Since we purchased the Mark IV in '99, the company has changed hands, and they want $400 minimum for any Mark IV repair. The local commercial radio company that takes care of the city, fire, police, etc has Kenwood repeaters but I don't think they go down to our frequency, 144.79/145.39. For now the old Icom is working. Thanks Scott.. 73, Mike K9MI - Original Message - From: Scott Zimmerman To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 20:10 Subject: Re: [Repeater-Builder] Low Repeater output at site only Mike, I would strongly suspect the Mark IV is having problems. My experience with those repeaters has NOT been good. They seem to be VERY spooky. Especially when it comes to high RF environments. Most of these units were fine when they were first produced, but as the components age, they are becoming increasingly more problematic. Our local club had one since the early 80's. They dumped it in favor of a Micor conversion about 7 years ago and haven't looked back. Another local club still has theirs on the air. About the time our club got rid of ours, they decided to re-build theirs. Many hours and capacitors later, they had it working OK. Now, it's so deaf you have to run 50W 5 miles from the site to make an S5! If I were to hazard a guess at what your problem might be, I would guess it might be 2 things: 1. The PA drive control circuitry is interpreting the high RF at the site coming back down from the antenna to be reflected power and shutting the power amp down to keep from blowing it up. -- OR-- 2. The transmitter is spurring and the drive control is doing what it is supposed to do and shutting the transmitter back to keep from blowing it up. Do this: If you connect a dummy load and wattmeter to the duplexers instead of the antenna. Connect a wattmeter between the Tx and the duplexer . How many watts are coming from the Tx and how many watts do you have into the dummy load? Your duplexer loss should be less than 1/3. In other words if you have 30W from the PA, you should have more than 20W coming out of the duplexers into the dummy load. If not, you have duplexer trouble, or a spurious transmitter. I would then look at the transmitter on a spectrum analyzer and see how much 'grass' you are growing. Good luck, Scott Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 - Original Message - From: k9mi [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 2:29 PM Subject: [Repeater-Builder] Low Repeater output at site only Sorry, this isn't actually a repeater-builder question, but it is a repeater problem, and this is where I thought I could get the best info for the problem. We have a Mark IV that has worked well for 9 years. It's really still working well, but here is what is going on. With a Bird watt meter, the Mark IV shows 3 watts out. If another member of the club, using the same meter and a dummy load, shows 32 watts (usual for the Mark IV). We also have a backup repeater, and Icom IC-RP1510 that has always had an output of 18 watts, and still does. It shows 18 watts out, 1 reflected, same as it always has. These output readings are before the duplexers (Wacom 641). The mystery is the Mark IV works fine into a dummy load, but not at the site. The Icom works the same as always. The a/c voltage (this is at a hospital) is 124 volts. It is a multi-transmitter site, and the MFJ analyzer shows our DB 224 as pegged on the swr, then it will drop briefly to a low SWR, and then go back up for a couple of minutes, and then drop again . I think the MFJ analyzer is just getting RF'ed from another transmitter, and that the Bird is much more reliable under these circumstances. The Icom with 18 watts out, 1 reflected leads me to believe the system is fine, but why would the Mark IV have an output of 3 watts into the Bird watt meter (nothing reflected), but into a dummy load, the
Re: [Repeater-Builder] MSR2000 transmit spike
At 10:15 AM 1/17/2008, you wrote: We disconnected the PA and connected the duplexer directly to the exciter. The spike seems to be coming from the exciter itself. -Is you duplexer a notch only type? If it is and it still allows RF 14 megs away from its center frequency to pass with minimal attenuation, you have something else going on. Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
[Repeater-Builder] Re: MOTOROLA ntn4635a charger schematic needed
If for some very strange reason you want to see the internals of the HT-600 / MT-1000 battery (related to your work with the charger units)... you might find the following useful: http://www.radiowrench.com/sonic/so02009.html from the main page at: http://www.radiowrench.com/sonic/ (8th choice under the blue divider bar) enjoy, s. Mike Morris WA6ILQ [EMAIL PROTECTED] wrote: At 02:11 PM 01/16/08, you wrote: Hi,my charger quit on me looking for a schematic and parts list. thanksmike.n8rtn.. The 4635 is the standard rate only charger for the Genesis series of radios - the HT600 / MT1000. The standard / rapid charger is the NTN4633 or 5538 series. In your case I'd pick up a 4633 or 5538 charger off of ebay. I think that the only difference between the 4633 and the 5538 is the color in the plastic shell, and the 5538 has some circuitry updates. The 5538 manual is on www.repeater-builder.com on the Genesis page. I have a really grungy looking 4633 that I'll sell you for a few dollars plus shipping - it works perfectly, it just has some splashes of white paint on it. It's been sitting on the shop workbench for years, and I recently lost my house and shop, and am now living in a mobile home. You could swap your outer housing on it and it would be perfectly good.. Contact me off-list. Mike WA6ILQ
[Repeater-Builder] Re: Low Repeater output at site only
Michael Brown [EMAIL PROTECTED] wrote: Since we purchased the Mark IV in '99, the company has changed hands, and they want $400 minimum for any Mark IV repair. We/I can service the Mark IV Repeater no problama'. In most cases If you pay the shipping (both ways) I/we will give a you a free repair/service estimate. And that estimate/service option is pretty much available for any equipment brand model including some you might not imagine to be so easily repaired. Feel free to email direct or call for information and my famous free 50-cent opinions specific to your equipment. :-) If nothing else I'll give you a pretty good guess as to what I believe might be a possible problem/gremlin source. The local commercial radio company that takes care of the city, fire, police, etc has Kenwood repeaters but I don't think they go down to our frequency, 144.79/145.39. For now the old Icom is working. 73, Mike K9MI I currently have two Mark IV repeaters in service and they work pretty well for what they are. Pretty much like any of these type repeaters... they have their quirks but nothing to get really excited about. And of course the shameless plug applies... like many other group members I'm also an Authorized Kenwood Dealer for new equipment sales and unlike many of the others a full Authorized Kenwood Service Station for pretty much everything and many other radio brands. cheers, skipp skipp025 at yahoo.com www.radiowrench.com
[Repeater-Builder] Re: Low Repeater output at site only
Note that the built-in controller in the early Kenwoods (i.e. the 720 models) is pretty brain-dead and does not meet amateur requirements. Those that use those models just set them up as duplex base stations and use an external controller. Requirements or typical desired amateur operation ..? s.
Re: [Repeater-Builder] Low Repeater output at site only
Scott, Thanks for all of the good information from you and the rest of the group. This is a club repeater that gets very little use anymore and it will have to be voted on if we can spend anything over $50. Our club has shrank in size to about half in the last 12 years. We have a town of around 40k with 5 quiet (for the most part) repeaters. But I will gladly except any estimates anyone wants to send. I think we still have enough die hards around, that we will finance a repeater ourselves if we have to. Please send them to [EMAIL PROTECTED] so we can keep from cluttering the reflector. Thanks and 73, Mike K9MI - Original Message - From: Scott Zimmerman To: Repeater-Builder@yahoogroups.com Sent: Thursday, January 17, 2008 16:11 Subject: Re: [Repeater-Builder] Low Repeater output at site only Mike, Realize that here at Repeater-Builder (the company) we build such Micor and MII repeaters. Let me know if you would like me to work up a quote for you. Scott Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 - Original Message - From: Michael Brown To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 5:15 PM Subject: Re: [Repeater-Builder] Low Repeater output at site only Thanks Scott. Just during the Christmas holiday season, one of our members who just moved to El Paso said that the clubs there have had bad luck with the Mark IV also, and all have gone to a Micor or something similar. Since we purchased the Mark IV in '99, the company has changed hands, and they want $400 minimum for any Mark IV repair. The local commercial radio company that takes care of the city, fire, police, etc has Kenwood repeaters but I don't think they go down to our frequency, 144.79/145.39. For now the old Icom is working. Thanks Scott.. 73, Mike K9MI - Original Message - From: Scott Zimmerman To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 20:10 Subject: Re: [Repeater-Builder] Low Repeater output at site only Mike, I would strongly suspect the Mark IV is having problems. My experience with those repeaters has NOT been good. They seem to be VERY spooky. Especially when it comes to high RF environments. Most of these units were fine when they were first produced, but as the components age, they are becoming increasingly more problematic. Our local club had one since the early 80's. They dumped it in favor of a Micor conversion about 7 years ago and haven't looked back. Another local club still has theirs on the air. About the time our club got rid of ours, they decided to re-build theirs. Many hours and capacitors later, they had it working OK. Now, it's so deaf you have to run 50W 5 miles from the site to make an S5! If I were to hazard a guess at what your problem might be, I would guess it might be 2 things: 1. The PA drive control circuitry is interpreting the high RF at the site coming back down from the antenna to be reflected power and shutting the power amp down to keep from blowing it up. -- OR-- 2. The transmitter is spurring and the drive control is doing what it is supposed to do and shutting the transmitter back to keep from blowing it up. Do this: If you connect a dummy load and wattmeter to the duplexers instead of the antenna. Connect a wattmeter between the Tx and the duplexer . How many watts are coming from the Tx and how many watts do you have into the dummy load? Your duplexer loss should be less than 1/3. In other words if you have 30W from the PA, you should have more than 20W coming out of the duplexers into the dummy load. If not, you have duplexer trouble, or a spurious transmitter. I would then look at the transmitter on a spectrum analyzer and see how much 'grass' you are growing. Good luck, Scott Scott Zimmerman Amateur Radio Call N3XCC 612 Barnett Rd Boswell, PA 15531 - Original Message - From: k9mi [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 16, 2008 2:29 PM Subject: [Repeater-Builder] Low Repeater output at site only Sorry, this isn't actually a repeater-builder question, but it is a repeater problem, and this is where I thought I could get the best info for the problem. We have a Mark IV that has worked well for 9 years. It's really still working well, but here is what is going on. With a Bird watt meter, the Mark IV shows 3 watts out. If another member of the club, using the same meter and a dummy load, shows 32 watts (usual for the Mark IV). We also have a backup repeater,
[Repeater-Builder] MSR2000 transmit spike
I have a MSR2000 repeater that transmits on 171.350mhz. We are seeing a transmit spike at 157.072mhz. It is strong enough to break squelch 10+ blocks away with legible copy on the spike frequency. We disconnected the PA and connected the duplexer directly to the exciter. The spike seems to be coming from the exciter itself. Would anyone have any suggestions on where to look on the exciter board to fix this short of installing a notch filter between exciter PA? I haven't yet checked across the band for other spikes with a spectrum analyzer but I fear there may be other spikes as well. Thanks for the help! Best Regards, Bill - W4RVN
RE: [Repeater-Builder] MSR2000 transmit spike
The MSR2000 Tx multiplier is 12x the channel element frequency if I remember right, so the crystal fundamental would be 14.279167. 157.071 would be the 11x product if that's the case. Look for a similiar spur on the other side of carrier. The exciter may be bad or not properly tuned, or it could be something as simple as a grounding/shielding issue. Been a while since I worked on a highband MSR2000, but I don't believe there is an external filter (helical resonator type or otherwise) between the exciter and the PA like there is on a Micor, so more than likely it's a problem on the exciter board itself. Is this station being operated within the design range? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Bill Photinos Sent: Thursday, January 17, 2008 1:15 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MSR2000 transmit spike I have a MSR2000 repeater that transmits on 171.350mhz. We are seeing a transmit spike at 157.072mhz. It is strong enough to break squelch 10+ blocks away with legible copy on the spike frequency. We disconnected the PA and connected the duplexer directly to the exciter. The spike seems to be coming from the exciter itself. Would anyone have any suggestions on where to look on the exciter board to fix this short of installing a notch filter between exciter PA? I haven't yet checked across the band for other spikes with a spectrum analyzer but I fear there may be other spikes as well. Thanks for the help! Best Regards, Bill - W4RVN Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release Date: 12/19/2007 7:37 PM
Re: [Repeater-Builder] MSR2000 transmit spike
The Duplexer is a Sinclair Q202G Bp/Br type. The notches are 90db down at our split 164.3125/171.3500 Repeater is operating in it's designed Freq range. ..Bill Ken Arck wrote: -Is you duplexer a notch only type? If it is and it still allows RF 14 megs away from its center frequency to pass with minimal attenuation, you have something else going on.
Re: [Repeater-Builder] 1272 Mhz Preamp
I've used Chip Angle's band-pass filters and preamps with very good results and he's always been willing to chat on the phone. http://www.anglelinear.com -Sean I am looking for a supplier of low noise high performance receiver preamps and preselectors for a 1272.100 receiver. I have contacted one of the suppliers on the repeater builder information page, but I placed the order in August and cannot get anything but an answering machine and no returned calls. First hand information would be nice. 73, Steve NU5D -- /Subscribe to dstar_digital/ Powered by groups.yahoo.com http://groups.yahoo.com/group/dstar_digital/
[Repeater-Builder] 1272 Mhz Preamp
I am looking for a supplier of low noise high performance receiver preamps and preselectors for a 1272.100 receiver. I have contacted one of the suppliers on the repeater builder information page, but I placed the order in August and cannot get anything but an answering machine and no returned calls. First hand information would be nice. 73, Steve NU5D -- /Subscribe to dstar_digital/ Powered by groups.yahoo.com http://groups.yahoo.com/group/dstar_digital/
RE: [Repeater-Builder] Re: Scotchkoat
mekp is the hardner in many body fillers.(peroxide) To: Repeater-Builder@yahoogroups.com From: [EMAIL PROTECTED] Date: Wed, 9 Jan 2008 11:41:40 -0500 Subject: Re: [Repeater-Builder] Re: Scotchkoat Hi Paul, thank you for this info, based on this I'm sure it's in the auto car paint thinner, which I used a lot for cleaning stuff without a respirator, and cloves hi hi, I know that stuff could give you I high. Will do some research on the chemical we use here and try very hard to use protection when using them. v44kai.Joel. - Original Message - From: Paul Finch To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 09, 2008 10:24 AM Subject: RE: [Repeater-Builder] Re: Scotchkoat Joel, It’s name is Methyl Ethel Ketone or MEK for short. It is what makes some glues dry fast and it’s also what kids get high on when the sniff glue. Most spray paint cans have it to help the paint dry faster. It is dangerous stuff. Paul From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of v44kai Sent: Wednesday, January 09, 2008 7:45 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Scotchkoat Hi Tim, What is MEK, I do not know that product, or what it stands for (MEK) but your experience is very interesting and encouraging. v44kai.Joel. - Original Message - From: Tim and Janet To: Repeater-Builder@yahoogroups.com Sent: Wednesday, January 09, 2008 7:25 AM Subject: [Repeater-Builder] Re: Scotchkoat Please believe and listen to these warnings. Several years ago I decided to go back to the gym and get back into shape. I went to the doctor for a physical which included a blood test. As part of the test they look at two liver enzymes. One of mine was high just outside the normal range. The doctor said to come back in a month to retest. The next month the first enzyme went higher and the other one went off the scale. I had a liver ultrasound which came back normal. He then ordered a liver Biopsy. Not a pleasant experience!!! The biopsy came back almost normal other than signs of age and a body that had been neglected. Each blood test after this my enzymes started coming back into range. When I (we) tried to figure out what had happened the only thing that we could link it to was MEK. I had just finished building a small experimental airplane that is made up of aluminum tubing and fabric. All of the aluminum was cleaned with MEK and the glue contained MEK and was thinned with additional MEK. All of this work was done with large opening doors and most of the time had a fan running. Most of the time I did not use gloves. The facility I work in has MEK banned. Not due to my experience but because of environmental concerns. MEK is great stuff like a lot of other chemicals that we take for granted. Please use them in accordance with all warnings. By the way MEK is still available by the gallon at Home Depot and Lowes locally. I now ventilate the room wear gloves and a respirator when using this product. I apologize for the long email but wanted to warn those that may expose themselves to chemicals. Tim KB2MFS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jim Brown Sent: Tuesday, January 08, 2008 11:40 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Scotchkoat Take it seriously when they say something has been proved to cause cancer. I have a buddy who lost his leg to cancer and they traced it back to a solvent he used as a jet engine mechanic in the Air Force. He managed to live through it, but minus a leg. They proved beyond a doubt that it was the solvent that caused the cancer. Sorry I don't remember just which solvent it was - 73 - Jim W5ZIT Back to top Reply to sender | Reply to group | Reply via web post Messages in this topic (21) 2h. Re: Scotchkoat Posted by: Mike Besemer (WM4B) [EMAIL PROTECTED] mwbesemer2000 Tue Jan 8, 2008 2:52 pm (PST) More than likely the solvent in question was carbontetrachloride. That's what was used prior to my AF time (starting in 1981), when we used PD-680. We also had trichlorethaline and MEK. Regardless of the solvent in question, if you like your liver (and
Re: [Repeater-Builder] 1272 Mhz Preamp
You can build your own. I believe there are plans in the mid 90's ARRL hand books using MRF-901s. Add an interdigital bandpass filter, 2 poles in front and 3 in back. But you will need test equipment to align it. You can also try MMICs. Some are fairly low noise, but it will keep the part count low. On 1/17/08, Steven Samuel Bosshard (NU5D) [EMAIL PROTECTED] wrote: I am looking for a supplier of low noise high performance receiver preamps and preselectors for a 1272.100 receiver. I have contacted one of the suppliers on the repeater builder information page, but I placed the order in August and cannot get anything but an answering machine and no returned calls. First hand information would be nice. 73, Steve NU5D -- /Subscribe to dstar_digital/ Powered by groups.yahoo.com http://groups.yahoo.com/group/dstar_digital/ Yahoo! Groups Links
Re: [Repeater-Builder] Re: MSR2000 transmit spike
At 04:06 PM 1/17/2008, you wrote: This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked. --I'm still wondering how a low level signal 14 megs away from the passband of a duplexer (assuming it's a Bp/Br) can radiate any distance. Ken
Re: [Repeater-Builder] 1272 Mhz Preamp
I am personally a big fan of Advanced Receiver Research (Burlington, CT). I just ordered 3 different pre-amps from them and had them in a few days. James [EMAIL PROTECTED] wrote: I've used Chip Angle's band-pass filters and preamps with very good results and he's always been willing to chat on the phone. http://www.anglelinear.com http://www.anglelinear.com -Sean I am looking for a supplier of low noise high performance receiver preamps and preselectors for a 1272.100 receiver. I have contacted one of the suppliers on the repeater builder information page, but I placed the order in August and cannot get anything but an answering machine and no returned calls. First hand information would be nice. 73, Steve NU5D -- /Subscribe to dstar_digital/ Powered by groups.yahoo.com http://groups.yahoo.com/group/dstar_digital/ http://groups.yahoo.com/group/dstar_digital/
[Repeater-Builder] Re: MSR2000 transmit spike
Re: MSR2000 transmit spike With a copy of the Service Manual in hand... do a complete new equipment alignment of the exciter board. This means you preset all the coils and the output filter adjustments to the heights indicated in the manual charts for your specific frequency. This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked. Fudging the alignment using the tweak and peak method is as often demonstrated by people in a hurry... is not a good thing. cheers, skipp Bill Photinos [EMAIL PROTECTED] wrote: I have a MSR2000 repeater that transmits on 171.350mhz. We are seeing a transmit spike at 157.072mhz. It is strong enough to break squelch 10+ blocks away with legible copy on the spike frequency. We disconnected the PA and connected the duplexer directly to the exciter. The spike seems to be coming from the exciter itself. Would anyone have any suggestions on where to look on the exciter board to fix this short of installing a notch filter between exciter PA? I haven't yet checked across the band for other spikes with a spectrum analyzer but I fear there may be other spikes as well. Thanks for the help! Best Regards, Bill - W4RVN
[Repeater-Builder] Re: MSR2000 transmit spike
Simple... it's an unwanted rf signal. Ken Arck [EMAIL PROTECTED] wrote: --I'm still wondering how a low level signal 14 megs away from the passband of a duplexer (assuming it's a Bp/Br) can radiate any distance. Ken At 04:06 PM 1/17/2008, you wrote: This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked.
[Repeater-Builder] Re: Scotchkoat
You guys ever figure out and actually test a solvent that works on Scotchkoat? I've never found a solvent that did a good job... especially after it (the Scotchkoat aka scotchcoat) had a chance to dry. curious minds want to know... cheers, s. Barry C' [EMAIL PROTECTED] wrote: mekp is the hardner in many body fillers.(peroxide) To: Repeater-Builder@yahoogroups.com From: [EMAIL PROTECTED] Date: Wed, 9 Jan 2008 11:41:40 -0500 Subject: Re: [Repeater-Builder] Re: Scotchkoat
[Repeater-Builder] Re: Linking Several Repeater Sites
Re: Linking Several Repeater Sites Not one to go with the rest of the crowd... I'm more of a fan of using a mountain top chain linking method. Hard to explain the difference versus hub linking but the chain system operation works much butter 4 me. You might try the Cat Auto or Link Site to see if they describe chain linking... Otherwise we can review it in the next day or two. C ya' s. Rich [EMAIL PROTECTED] wrote: Our repeater group has four hilltop 440 MHz repeater sites which are currently linked via 430 MHz full duplex links through a central hub site on the ground (low level site - not a hilltop). This has worked great, but it looks like we are losing our hub location and this has led to some discussion within the group. Some of us want to take the hardware at the hub (controller, antennas, link radios, filters, etc.) and relocate the hub to a new location. Depending on how far we move, this might entail re-aiming link yagis on the hilltops but, more than likely, not. Another group wants to do away with the hub altogether and perform linking from site to site to site to site. The thought being that it would free up the RLC3 controller that we use at the hub for other uses, we wouldn't have to worry about maintaining the hub site, and would not even have to find a new site. Downside is moving all the link hardware to the hilltops. Since there are a lot of old hands out here, I thought I'd ask for opinions. What are the pros and cons of linking multiple sites via a hub vs. linking point-to-point? What's the best method and why? Thanks, in advance, for your help and opinions. -- Rich
RE: [Repeater-Builder] Re: Scotchkoat
Skipp, MEK will soften it, the problem is it dries to fast and you're right back to square one. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Thursday, January 17, 2008 7:27 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Scotchkoat You guys ever figure out and actually test a solvent that works on Scotchkoat? I've never found a solvent that did a good job... especially after it (the Scotchkoat aka scotchcoat) had a chance to dry. curious minds want to know... cheers, s. Barry C' [EMAIL PROTECTED] wrote: mekp is the hardner in many body fillers.(peroxide) To: Repeater-Builder@yahoogroups.com From: [EMAIL PROTECTED] Date: Wed, 9 Jan 2008 11:41:40 -0500 Subject: Re: [Repeater-Builder] Re: Scotchkoat Yahoo! Groups Links No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.5/1228 - Release Date: 1/16/2008 9:01 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.5/1228 - Release Date: 1/16/2008 9:01 AM Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * 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/
RE: [Repeater-Builder] Re: MSR2000 transmit spike
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Thursday, January 17, 2008 4:11 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: MSR2000 transmit spike At 04:06 PM 1/17/2008, you wrote: This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked. --I'm still wondering how a low level signal 14 megs away from the passband of a duplexer (assuming it's a Bp/Br) can radiate any distance. Ken
RE: [Repeater-Builder] Re: MSR2000 transmit spike
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Thursday, January 17, 2008 7:11 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: MSR2000 transmit spike At 04:06 PM 1/17/2008, you wrote: This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked. --I'm still wondering how a low level signal 14 megs away from the passband of a duplexer (assuming it's a Bp/Br) can radiate any distance. Ken There is a lot of misunderstanding of Bp/Br duplexers. Just because it has the word band pass in the title doesn't mean that it is a good band pass device. If you look at the curves of most Bp/Br duplexers you will see that between the notch frequencies there is excellent band pass rejection because of the cumulative skirts of the filters in both sides of the duplexer in this area. However when you get on the outside of the notches there is little band pass effect and it is usually quite broad in respect to a true band pass filter. Also the ultimate rejection trails off too in most cases as you move farther away in frequency. As far as interference goes, either incoming or outgoing, it is all a matter of how much attenuation the filter devices are providing. As a note that may come in handy for someone chasing interference, you can use a pass band cavity as a notch cavity by just putting a T connector on one side and inserting it in line. Leave the other connection to the other loop blank. 73 Gary K4FMX
RE: [Repeater-Builder] Re: MSR2000 transmit spike
Ken, How right you are! I wish I had a nickel (actually, I wish I had $10) for every radio that was brought to me with the complaint I did a complete tune-up on this radio, and now it doesn't work! We call these guys diddle-stick artists. While I am not suggesting that the topic poster did such an abomination, there is the possibility that whoever tuned up the subject radio either did not have all of the appropriate test equipment or the manufacturer's tune-up instructions. It has happened to me, so I know it can happen to others. Of course, there may be a failed part that is causing the spur. Some radios are extremely prone to generating weird spurs if the tuning instructions are not followed precisely. Also, it is very important that all shield plates be reinstalled, with every required screw in place, to avoid leakage. Bottom Line: Tuning for maximum signal is not always the best policy! 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Thursday, January 17, 2008 4:11 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: MSR2000 transmit spike At 04:06 PM 1/17/2008, you wrote: This sort of thing happens a lot when people do a tweak peak adjustment of an already working transmitter/exciter. Some stages are by default properly aligned first for a meter dip indication while others are peaked. --I'm still wondering how a low level signal 14 megs away from the passband of a duplexer (assuming it's a Bp/Br) can radiate any distance. Ken
RE: [Repeater-Builder] 1272 Mhz Preamp
Try Wd5ago in Tulsa OK. He is a well respected preamp builder in EME circles and also builds and sells stuff for the SETI program. You can usually catch him on the 70cm EME net Saturday mornings 14.345 John Lock kf0m at arrl.net -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Steven Samuel Bosshard (NU5D) Sent: Thursday, January 17, 2008 3:37 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] 1272 Mhz Preamp I am looking for a supplier of low noise high performance receiver preamps and preselectors for a 1272.100 receiver. I have contacted one of the suppliers on the repeater builder information page, but I placed the order in August and cannot get anything but an answering machine and no returned calls. First hand information would be nice. 73, Steve NU5D -- /Subscribe to dstar_digital/ Powered by groups.yahoo.com http://groups.yahoo.com/group/dstar_digital/ Yahoo! Groups Links
RE: [Repeater-Builder] MOTOROLA ntn4635a charger schematic needed
Mike, The schematic diagram and parts list for the NTN4635B Single-Unit Battery Charger is in Section II of Motorola Publication 6881108C83. Dunno what difference there is between the A and B versions. I have scanned that section and have emailed it to you directly. Other interested parties, please contact me off-list. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of n8rtn Sent: Wednesday, January 16, 2008 2:12 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MOTOROLA ntn4635a charger schematic needed Hi,my charger quit on me looking for a schematic and parts list. thanksmike.n8rtn..
[Repeater-Builder] Micor power supply issue
Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D
Re: [Repeater-Builder] Micor power supply issue
The main supply is only used for the PA, so a bit of AC there won't cause hum in the audio. Check the regulated 9.6 and 12.v supplies on the PC board, these tend to dry out the 100uf caps causing hum. A simple check with a scope will tell all. Motorola's spec on AC is 60millivolts, max. on any supply. if your main supply is sagging below 13.0 volts, check the 2 chassis mounted diodes. it is normal for this part of the supply to start out at about 15.5 volts and drop to as low as 13 ( normal). lance N2HBA - Original Message - From: kk2ed To: Repeater-Builder@yahoogroups.com Sent: Thursday, January 17, 2008 10:59 PM Subject: [Repeater-Builder] Micor power supply issue Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D
RE: [Repeater-Builder] Micor power supply issue
Eric, Without knowing what model of power supply you have, my first guess is that you have an open diode in the high-current supply. An open diode will cause low voltage, high ripple, and major hum. However, your comment suggests a gradual onset of hum, which may indicate a filter capacitor failure. If your power supply has a ferro-resonant transformer, you may have a bad commutating capacitor. Not enough info to make this call... Do you have the manual for your specific power supply? If not, what model power supply is it? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of kk2ed Sent: Thursday, January 17, 2008 7:59 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor power supply issue Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D
Re: [Repeater-Builder] Micor power supply issue
While I don't have experience with that particular power supply, the situation you describe is symptomatic of filter capacitor failure. The capacitor's equivalent series resistance (ESR) becomes so high that it doesn't filter the ac ripple anymore. You should be able to verify this easily by using a scope to observe the ac ripple on the dc output under various load conditions. Eric KH6CQ --- kk2ed [EMAIL PROTECTED] wrote: Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
[Repeater-Builder] Re: Micor power supply issue
Let me clarify a little bit I am using the supply to power the Micor repeater as well as a GM300 link transceiver. A few weeks ago I started to notice a slight hum on the link radio's transmitted signal. Now, the hum is so bad, and voltage drop significant, that the GM300's transmit signal is dirty and sounds like a spurious emitter when transmitting. If I disable the main repeater TX (Micor), so as to lessen the load and only have the GM300 transmitting, the hum goes away. Being the GM300 only uses the 13.8v output, I'm guessing the other outputs are ok. I forgot to mention - When I stopped at the site the other day, I heard the transformer buzzing, which increased in loudness when the repeater was keyed (thus placing a heavier load on the transformer). Possible transformer or resonant circuit capacitor failure? I will be stopping at the site in the morning to investigate further and swap it out with a spare. I'll report back with my findings later tomorrow. Thanks Eric KE2D --- In Repeater-Builder@yahoogroups.com, Eric Grabowski [EMAIL PROTECTED] wrote: While I don't have experience with that particular power supply, the situation you describe is symptomatic of filter capacitor failure. The capacitor's equivalent series resistance (ESR) becomes so high that it doesn't filter the ac ripple anymore. You should be able to verify this easily by using a scope to observe the ac ripple on the dc output under various load conditions. Eric KH6CQ --- kk2ed [EMAIL PROTECTED] wrote: Good Evening, I have a Micor 75 station power supply that is acting up. When the repeater is idle, the voltage output appears clean. But as the load is increased (ie: power output increased), the voltage sags and I get an annoying hum on the tx (indicative of AC ripple on the dc side?). It started out as a barely noticeable hum; the past few days it has gotten to the point where I just shut down the repeater's tx. I haven't had a chance to get to the site to swap it out with a spare. But I'm curious as to what kind of repair I'm in for, and others' experience with Micor supplies. What tends to be the failure and/or cause of the above condition? Pass transistor failure? Filter caps? Ferro-resonant circuit (cap)? Thanks for any input Eric KE2D _ ___ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
