Re: [Repeater-Builder] White Noise on Micor TX
On Sun, 23 May 2010, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Are you set up for transmitting a PL/CTCSS? -- Kris Kirby, KE4AHR Disinformation Analyst
Re: [Repeater-Builder] Need source for UHF power module
Pacific have been out of Kenwood for ages, Best bet is to contact Kenwood directly, or try RF Parts.com in the states. Before you do that, check if the power module has in fact Spat the dummy as many of the TKR-720 and 820's suffered from dry joints in the PA stage. So firstly I would suck up, clean the contacts and reflow with high silver content solder, especially around the inductors. Check for high (Or normal) current draw when running the repeater on 12 volts and if there is little or no RF out the transmit socket, suspect dry joints. I've re-soldered more TKR final stages than actually replacing the Hybrid PA module. Hope this helps? Gareth Bennett RadioSystems P.O. Box 5202 Dunedin 9024 New Zealand - Original Message - From: x.tait.tech get real To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 9:34 AM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J
Re: [Repeater-Builder] White Noise on Micor TX
Hi Tim, Might the RX be hearing the TX? Doug - GM7SVK On 23/05/2010 04:10:37, Tim - WD6AWP (tisaw...@gmail.com) wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP Yahoo! Groups Links
[Repeater-Builder] Re: Need source for UHF power module
I think this is what you are looking for - http://www.trademe.co.nz/Electronics-photography/Radio-equipment/Amateur-radio/auction-292086327.htm If this will do the job let me know and we can arrange to buy and send it to you. I have a paypal account for payment. I am away from home till Wednesday this week. Cheers, Graham. --- In Repeater-Builder@yahoogroups.com, Gareth Bennett gare...@... wrote: Pacific have been out of Kenwood for ages, Best bet is to contact Kenwood directly, or try RF Parts.com in the states. Before you do that, check if the power module has in fact Spat the dummy as many of the TKR-720 and 820's suffered from dry joints in the PA stage. So firstly I would suck up, clean the contacts and reflow with high silver content solder, especially around the inductors. Check for high (Or normal) current draw when running the repeater on 12 volts and if there is little or no RF out the transmit socket, suspect dry joints. I've re-soldered more TKR final stages than actually replacing the Hybrid PA module. Hope this helps? Gareth Bennett RadioSystems P.O. Box 5202 Dunedin 9024 New Zealand - Original Message - From: x.tait.tech get real To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 9:34 AM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@... wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J
Re: [Repeater-Builder] White Noise on Micor TX
I had this on a Mastr II and solved it by adding a resistor across the audio input to the exciter - I think I used a 100K, but you could experiment. It originally sounded like squelch noise leakage, but it wasn't. Chuck WB2EDV - Original Message - From: Tim - WD6AWP tisaw...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 12:10 AM Subject: [Repeater-Builder] White Noise on Micor TX I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2890 - Release Date: 05/22/10 14:26:00
Re: [Repeater-Builder] White Noise on Micor TX
At 5/22/2010 21:10, you wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP I never heard of this problem on a Moto radio, but the G.E.s will do this if the CG (PL) input on the TX is left unloaded. Somehow a bit of the RX's discriminator output leaks into the phase modulator. Apparently it has a very high impedance, as any load on it eliminates the problem. You might loading the PL input on the Micor see if it has the same effect. Is this a VHF or UHF radio, is it currently on the air? (I can probably hear it from here) Bob NO6B
[Repeater-Builder] Re: Need source for UHF power module
http://www.rfparts.com/module_m.html#m57704el Otherwise I might have on in stock somewhere... but right now it wouldn't be an easy find for me. cheers, skipp skipp025 at yahoo.com Authorized Kenwood Service Station (and Sales). www.radiowrench.com --- In Repeater-Builder@yahoogroups.com, byronhham hellewe...@... wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J
Re: [Repeater-Builder] White Noise on Micor TX
Yes, it has a stock Motorola PL encode board. I think the noise was there before I installed it. -- :wq Tim
[Repeater-Builder] Re: White Noise on Micor TX
That seems unlikely I don't hear it in the local speaker. There is no detectable desense or other noise on the RX signal. --- In Repeater-Builder@yahoogroups.com, Doug Hutchison specialq@... wrote: Might the RX be hearing the TX?
[Repeater-Builder] White noise
Just curious. Have you put a scope on the power supply to check the AC component during transmit. A degraded filter cap or even a transistor with a small amount of leakage will generate what seems to be a touch of white noise under considerable load. Might seem too simple, but it happens alot. The RX will sound fine as not much load on supply. I'm assuming the TX freq is dead on? ( as you mention it is more prominent in some receivers than others) Did'nt see any mention of checking the obvious first. Just a kiss thought. Best of luck!
Re: [Repeater-Builder] White Noise on Micor TX
Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP Yahoo! Groups Links
[Repeater-Builder] Re: Need source for UHF power module
Came across this site. http://www.look4ic.com http://www.look4ic.com CJD --- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@... wrote: http://www.rfparts.com/module_m.html#m57704el Otherwise I might have on in stock somewhere... but right now it wouldn't be an easy find for me. cheers, skipp skipp025 at yahoo.com Authorized Kenwood Service Station (and Sales). www.radiowrench.com --- In Repeater-Builder@yahoogroups.com, byronhham hellewellb@ wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J
Re: [Repeater-Builder] White Noise on Micor TX
Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
RE: [Repeater-Builder] White Noise on Micor TX
Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com mailto:tsoliver%40tir.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
Re: [Repeater-Builder] Need source for UHF power module
Hello Byron, The M57729 is a standard Motorola PA Slab. Yours is the Kenwood Part number, M57729h-01-P. The standard Motorola module will be available off the shelf,,, BUT,,, it will be priced @ $230.oo US. Any equivalent Motorola, or spurious part [30W UHF] will do the job, much cheaper,,, you can cross reference on any good RF Components web site in your area. You may source one from a scrap [ out of spec ] mobile PMR radio for $10.oo, if you know where to look ! 25 watt would be much cheaper and easier to find. Hope this is of some help. 73 from Ireland. Peter EI4HX ei4hxperimen...@eircom.net - Original Message - From: x.tait.tech get real To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 22, 2010 10:34 PM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J
Re: [Repeater-Builder] White Noise on Micor TX
Chuck, I did over look that part about being disconnected. Is it present when you have a full quieting signal on the rx input? He may still have an audio path feeding the tx. How about pulling the audio squelch board and trying the local ptt? tom On 5/23/2010 12:54 PM, Chuck Kelsey wrote: Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Olivertsoli...@tir.com To:Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP Yahoo! Groups Links
Re: [Repeater-Builder] Need source for UHF power module
RF Parts in California lists the M57729 for $ 68 (US) http://www.rfparts.com/module_m.html#m57704el Dave WB2FTX - Original Message - From: P Grant To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 9:37 AM Subject: Re: [Repeater-Builder] Need source for UHF power module Hello Byron, The M57729 is a standard Motorola PA Slab. Yours is the Kenwood Part number, M57729h-01-P. The standard Motorola module will be available off the shelf,,, BUT,,, it will be priced @ $230.oo US. Any equivalent Motorola, or spurious part [30W UHF] will do the job, much cheaper,,, you can cross reference on any good RF Components web site in your area. You may source one from a scrap [ out of spec ] mobile PMR radio for $10.oo, if you know where to look ! 25 watt would be much cheaper and easier to find. Hope this is of some help. 73 from Ireland. Peter EI4HX ei4hxperimen...@eircom.net - Original Message - From: x.tait.tech get real To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 22, 2010 10:34 PM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2891 - Release Date: 05/23/10 02:26:00
Re: [Repeater-Builder] White Noise on Micor TX
He indicated that in repeat it was better (less white noise) with an incoming signal, then got worse on the tail. Then he disconnected the controller and still had white noise with local PTT. To me that hints of the exciter not liking a high impedance input, or no load on the mic input. That's why I suggested trying to add some resistance across the mic high and low at the exciter. Chuck - Original Message - From: Thomas Oliver tsoli...@tir.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 2:49 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Chuck, I did over look that part about being disconnected. Is it present when you have a full quieting signal on the rx input? He may still have an audio path feeding the tx. How about pulling the audio squelch board and trying the local ptt? tom
RE: [Repeater-Builder] Need source for UHF power module
Be careful about getting the proper replacement part. The basic M57729, without a suffix letter, is for 430-450 MHz. The M57729L is for 400-420 MHz, and the M57729H is for 450-470 MHz. There are other versions, with different suffixes, for other UHF bands. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Struebel Sent: Sunday, May 23, 2010 12:01 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Need source for UHF power module RF Parts in California lists the M57729 for $ 68 (US) http://www.rfparts.com/module_m.html#m57704el http://www.rfparts.com/module_m.html#m57704el Dave WB2FTX - Original Message - From: P Grant mailto:ei4hxperimen...@eircom.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 9:37 AM Subject: Re: [Repeater-Builder] Need source for UHF power module Hello Byron, The M57729 is a standard Motorola PA Slab. Yours is the Kenwood Part number, M57729h-01-P. The standard Motorola module will be available off the shelf,,, BUT,,, it will be priced @ $230.oo US. Any equivalent Motorola, or spurious part [30W UHF] will do the job, much cheaper,,, you can cross reference on any good RF Components web site in your area. You may source one from a scrap [ out of spec ] mobile PMR radio for $10.oo, if you know where to look ! 25 watt would be much cheaper and easier to find. Hope this is of some help. 73 from Ireland. Peter EI4HX ei4hxperimen...@eircom.net mailto:ei4hxperimen...@eircom.net - Original Message - From: x.tait.tech get real mailto:x.tait.t...@gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Saturday, May 22, 2010 10:34 PM Subject: Re: [Repeater-Builder] Need source for UHF power module there is a company here in New Zealand that used to or maybe still does deal with Kenwood products http://www.pacificaerials.co.nz/ http://www.pacificaerials.co.nz/ I know of no one else, other than Kenwood themselves Marcus On Sat, May 22, 2010 at 5:02 PM, byronhham hellewe...@utahwisp.com mailto:hellewe...@utahwisp.com wrote: Hi Does anyone know of a good source for a M57729h-01-p. It is the UHF power module in the Kenwood TKR-820. It is rated at 30 Watts 12 volts 440 to 470 MHz. I found that they do not like to be operated into the wrong side of a duplexer. For even a short time. Is it used in any other transceivers that might be purchased for the module? Thanks Byron NJ7J No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2891 - Release Date: 05/23/10 02:26:00
Re: [Repeater-Builder] White Noise on Micor TX
Would the same apply to an MSF2000 base station converted to a repeater? lh On Sun, May 23, 2010 at 1:10 PM, Eric Lemmon wb6...@verizon.net wrote: Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com tsoliver%40tir.com mailto: tsoliver%40tir.com tsoliver%2540tir.com To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
RE: [Repeater-Builder] White Noise on Micor TX
Larry, I know about MSR2000 and MSF5000 stations, but I've never heard of an MSF2000. Most stations that are built for simplex (base) operation lack the filtering that is standard in duplex (repeater) operation. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, May 23, 2010 1:35 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Would the same apply to an MSF2000 base station converted to a repeater? lh On Sun, May 23, 2010 at 1:10 PM, Eric Lemmon wb6...@verizon.net mailto:wb6...@verizon.net wrote: Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com mailto:tsoliver%40tir.com mailto:tsoliver%40tir.com mailto:tsoliver%2540tir.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%2540yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
[Repeater-Builder] Racom Station Identifier
Hi all I have a Racom 1300 morse code station Identifier. I am looking to see if there is a way to reprogram the Prom in the unit. The company is no longer active. The prom contains the call sign information. I know I could throw it in the trash and buy something new but I hate doing that when all it would take is to reprogram the Prom. Is there a way to read the prom and then change the information in it and then program a new prom provided I can find a new one. Thanks in advance Mike
[Repeater-Builder] Moto GR-1225
Hello all. I have a GR1225 that seems to work just fine except for one lil problem.. It will quite often stay keyed up after the signal or local mic is released. The only way to clear it is to shut it down and turn it back on.. Then it's good for like 10 sec's and does it again. It won't do it by itself but only after being keyed.. Any ideas?
Re: [Repeater-Builder] White Noise on Micor TX
A resistor certainly would be easy enough to try. As would popping in a spare exciter if he has one. tom On 5/23/2010 3:01 PM, Chuck Kelsey wrote: He indicated that in repeat it was better (less white noise) with an incoming signal, then got worse on the tail. Then he disconnected the controller and still had white noise with local PTT. To me that hints of the exciter not liking a high impedance input, or no load on the mic input. That's why I suggested trying to add some resistance across the mic high and low at the exciter. Chuck - Original Message - From: Thomas Olivertsoli...@tir.com To:Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 2:49 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Chuck, I did over look that part about being disconnected. Is it present when you have a full quieting signal on the rx input? He may still have an audio path feeding the tx. How about pulling the audio squelch board and trying the local ptt? tom Yahoo! Groups Links
RE: [Repeater-Builder] Moto GR-1225
Many early models of the GR1225 desktop repeater were delivered with RG-58 cable in the internal duplexer harnesses, which led to desensing and lockup. The problem becomes worse if carrier squelch is used. I was able to cure that problem by fabricating new harnesses with RG400 double-shielded cable. What are your RX and TX frequencies, and how much power is coming out of the transmit connector? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of k6kusman Sent: Sunday, May 23, 2010 2:23 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Moto GR-1225 Hello all. I have a GR1225 that seems to work just fine except for one lil problem.. It will quite often stay keyed up after the signal or local mic is released. The only way to clear it is to shut it down and turn it back on.. Then it's good for like 10 sec's and does it again. It won't do it by itself but only after being keyed.. Any ideas?
[Repeater-Builder] GE Master
Any of you guys had any experiences in using a GE Master Executive 11 as a repeater, and would you recommend it. Leroy J39AI
Re: [Repeater-Builder] GE Master
GE MasterThe Exec II has been used for lots of repeaters. Work well. Chuck WB2EDV - Original Message - From: Leroy A. M. Baptiste To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 23, 2010 6:17 PM Subject: [Repeater-Builder] GE Master Any of you guys had any experiences in using a GE Master Executive 11 as a repeater, and would you recommend it. Leroy J39AI -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2892 - Release Date: 05/23/10 14:26:00
Re: [Repeater-Builder] White Noise on Micor TX
Eric, I'm usually dyslexic on Yundas! It's a MSR2000. About 12 years ago I converted a base station variant to a repeater. As I recall I had some difficulty configuring it; i.e. there were some jumpers to add and remove, but thus puppy has been trucking along at a very busy site and nary a problem, 5 mHz split on VHF. Because it has been working so well I was wondering if some the older mega-kg Motos were produced with equal filtering in all variants. I was just luck, I guess. lh On Sun, May 23, 2010 at 4:47 PM, Eric Lemmon wb6...@verizon.net wrote: Larry, I know about MSR2000 and MSF5000 stations, but I've never heard of an MSF2000. Most stations that are built for simplex (base) operation lack the filtering that is standard in duplex (repeater) operation. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Sunday, May 23, 2010 1:35 PM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Would the same apply to an MSF2000 base station converted to a repeater? lh On Sun, May 23, 2010 at 1:10 PM, Eric Lemmon wb6...@verizon.netwb6fly%40verizon.net mailto:wb6...@verizon.net wb6fly%40verizon.net wrote: Has it been established whether the Micor station was originally built as a repeater, or is it a base station that has been converted into a repeater? A repeater station comes with a great deal of filter components added to the two interconnect boards, as well as extra shielding over the unified chassis shelves. A lot of strange things can happen if the shield plates are left off, or are not fastened with all screws. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com ] On Behalf Of Chuck Kelsey Sent: Sunday, May 23, 2010 9:55 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com Subject: Re: [Repeater-Builder] White Noise on Micor TX Tom, I believe he said that with the controller disconnected, and using local PTT, it still does it. That should take the receiver completely out of the equation, leaving only the exciter as the likely culprit. I'd suggested adding a resistor from ground to audio high on the exciter to see if that helps. It did for me on one Mastr II that I had. Might be something similar on his Micor. Certainly a very simple thing to try. Bob already asked about the PL board as that's another possible candidate, but was informed that there is a PL board installed already. Chuck WB2EDV - Original Message - From: Thomas Oliver tsoli...@tir.com tsoliver%40tir.com mailto: tsoliver%40tir.com tsoliver%2540tir.com mailto:tsoliver%40tir.com tsoliver%2540tir.com mailto: tsoliver%2540tir.com tsoliver%252540tir.com To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder%40yahoogroups.comRepeater-Builder%2540yahoogroups.com mailto:Repeater-Builder%2540yahoogroups.comRepeater-Builder%252540yahoogroups.com Sent: Sunday, May 23, 2010 12:21 PM Subject: Re: [Repeater-Builder] White Noise on Micor TX Has the noise been there all along? It may be just the nature of the beast. There is an article on the RB web site about modifying a mobile audio squelch board to work in a base/repeater station, one of the benifits to doing so is the better muting of audio from the receiver, this is because there are two shunt switches in the squelch chip and the mobile configuration uses both to mute the audio, in the repeater/base station configuration one of the shunt switches is used for station control like cos and not as affective at totally muting the audio. As designed the repeaters with their internal controller never had much hang time so it wasn't as noticeable. tom On 5/23/2010 12:10 AM, Tim - WD6AWP wrote: I have a small amount white noise on the TX of a Micor repeater. It is most noticeable in the hang time but it's not coming from the controller. It's still there with the controller completely removed and pressing PTT on the station control card. It's more noticeable on some radios, perhaps radios with higher audio frequency response. Anyone ever run into this before? Tim WD6AWP
[Repeater-Builder] MOTO R1225 QUESTION
Would it make a difference if I lower the high power setting from 45 watts down to 15 watts to drive a external TPL amplifier or the low power setting from 20 to 15?
[Repeater-Builder] Re: Lost 10 volts in a Master II UHF Repeater
Got it working! I had already swapped all the cards with my working spare repeater and there was no change. Went back up on the hill and pretty much pulled the cards, looked at the back plane, put the cards back in and fired it up...came right on! Strange. I've had a problem with this repeater for several years in that the PTT is stuck on. I bypassed it with a relay and don't use the internal controller so it hasn't bothered me for a while though. If anyone has an idea of what would make the PTT stick on it would be cool to try to fix it at some point. This is a Master II UHF repeater station. Seems like every time you try to do something that should be simple it turns out to be a BIG job. I'm lucky to live on the same hill as the tower... Ben
