Re: [Repeater-Builder] Multiple receivers one antenna ???
Ralph Hogan wrote: Along these lines, someone on the list mentioned using coax multi-dropped (coax tee) off to each receiver for a voter application. Can't find the original posting. I was curious about the lengths required between the antenna and then to each radio? Being that I work in the CATV field, I use common 75 ohm splitter arrangements for my remote receiver applications. They are cheap (free for me) and are easy to implement. Using a splitter of this type doesn't require any special length to be used from the splitter to the receiver; whatever is convenient is fine. At my one site where I use 250+ watts of transmitter power on VHF, I had discovered that my 4 way CATV splitter for my UHF link-back receivers was getting warm. I am not using any preselector or filter prior to the splitter and had found that 2.5 watts of VHF energy was being dissipated in the splitter. I figure this was happening as the UHF receivers were likely shorting out the VHF energy and it had to be dissipated somewhere. While the splitter gets pretty warm, it hasn't burnt up yet. I do have a helical preselector that I plan on implementing before the splitter. It's 2 sections should eliminate the power reaching the splitter and it should be able to dissipate the energy better. Kevin Custer 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/
Re: [Repeater-Builder] OT Radio Shack 10% Off Coupon good to 12/23
The reason is: they like to collect franchise fees. - Original Message - From: Mathew Quaife To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 18, 2005 10:09 PM Subject: Re: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23 I often wonder why, with 7000 stores across the world, why is Radioshacks buying power less than those that only have a third the stores. Not to mention, they are always 10% to 30% more on the cost then everyone else. GO FIGURE! 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] UHF Preamplifier
Have you guys tried the Simrex (formerly GLB) helical resonator pre-amp? It's great for repeater applications. Very selective and moderate gain. If you're using Bp-Br type cans you don't need any further filtering. http://www.simrex.com/site/products/preselector/Preselector1.pdfhttp://www.simrex.com/site/products/preselector/preselector_diagram.pdfI haven't bought one in quite a few years, but the last one I got was in the $150 range.Dan N8DJP Date: Sun, 18 Dec 2005 08:26:10 -0800 From: [EMAIL PROTECTED]Subject: Re: UHF PreamplifierAt 12/17/2005 10:15, you wrote:I've got the same setup. I also have a 4-sectionCelwave bandpass filter between the duplexer andpreamp. I found that the 17dB gain was way too muchfor the receiver, and the noise level increaseddramatically, to the point that I had to tighten thesquelch settings. The sig strength metering went from10 to 14uA with no signal.Why is that such a bad thing? If you add a preamp to a RX your measured noise power doesn't increase, it means that the largest source of noise in your system is still your RX that there's still room for improvement.Unless you're really worried about dynamic range, the ideal setup would be one in which the total noise power added by the addition of the preamp equals the noise present at the front end of the RX. This should provide the best balance of system noise figure dynamic range. If a 10 to 14 uA change represents 3 dB, then you'd be all set at that point.I don't know what's up with your carrier squelch. A well-designed squelch circuit shouldn't care how much noise power is present at the front end. Perhaps there's another problem with the RX: low gain in an IF stage, limiter problem, etc. that's causing the discriminator output to change with input noise power.Bob NO6B__Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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] UHF Preamplifier
Hi Dan, I have used several of them in the past. While they provide lots of preselection, they aren't great where NF is concerned. I believe a simple 2 section BP Cavity and GaAs device to follow would easily beat the GLB in performance; both in preselection and NF. Kevin Dan Hancock wrote: Have you guys tried the Simrex (formerly GLB) helical resonator pre-amp? It's great for repeater applications. Very selective and moderate gain. If you're using Bp-Br type cans you don't need any further filtering. http://www.simrex.com/site/products/preselector/Preselector1.pdf http://www.simrex.com/site/products/preselector/preselector_diagram.pdf I haven't bought one in quite a few years, but the last one I got was in the $150 range. Dan N8DJP 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/
Re: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23
Mathew Quaife wrote: They don't want to be an accessory store, unless it deals with batteries, video cables, cell phones and accessories, etc...they won't carry it. Believe it or not, they are even downsizing on the tv antenna's and home phone accessories. I found out that most everyone seems to be cutting back on carrying TV antennas. It's tough to find one lately. Which will be interesting when this DTV crap takes over and people find out they need an outside antenna now to get around the digital breakup (which is untolerable compared to the occasional noise on analog.) -- Jim Barbour WD8CHL 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/
RE: [Repeater-Builder] Multiple receivers one antenna ???
On Sun, 18 Dec 2005, Ralph Hogan wrote: Along these lines, someone on the list mentioned using coax multi-dropped (coax tee) off to each receiver for a voter application. Can't find the original posting. I was curious about the lengths required between the antenna and then to each radio? Ralph, Have a look at page seven of the PDF below and see if it doesn't look familiar. http://www.repeater-builder.com/antenna/tx-rx-elementary-introduction-to-ferrite-isolators-circulators-and-rf-loads.pdf -- Kris Kirby, KE4AHR [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security 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/
[Repeater-Builder] Re: TE Systems Amp Stories...
I've heard a number of these stories about TE Amplifiers. When times were really flush, TE's Amateur Amplifier line was very secondary to their commercial core amplifier products. Now times are a bit more lean and I see them advertising again in QST Magazine and other places. The rub is many Hams also work in the commercial side of radio and most of us (who made it through the 70's and 80's with some brain cells left intact) can pretty much remember being treated bad. Most every business is guilty of a dropped ball every once in a while but TE seems to make a regular go of poor customer service. Their products and quality are really first rate, but that doesn't make up for a lot of bad service. On-going bad service doesn't get the bills paid. cheers, skipp Maire-Radios [EMAIL PROTECTED] wrote: Got a UHF amp from them about 2 years ago. was to be 150 watts output with 5 watts in. Gave them all the info even the freg we wanted it tuned to. When it came in is put out 134 to 137 watts with the 5 watts in. Called a number of times but no call back. not sure if they still make product. Went back to Vocom for all of our amp. You get what you pay for with them and no problems. John 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/
[Repeater-Builder] Re: Multiple receivers one antenna ???
It may sound interesting (and cheap) but the reason that no one else has suggested it is because the impedance miss matches it causes. That is why you need something like a multicoupler whis is first a pre amp to keep the loss to a minimum then sends the pre amp to a splitter that maintains the 50 ohm match required by the receivers on each output port. If this approach was workable then the cable company would NEVER buy a splitter but would buy TEEs --- In Repeater-Builder@yahoogroups.com, Vincent Caruso [EMAIL PROTECTED] wrote: That sounds like an interesting solution, I would be interested in learning more about it. Ralph Hogan wrote: Along these lines, someone on the list mentioned using coax multi-dropped (coax tee) off to each receiver for a voter application. Can't find the original posting. I was curious about the lengths required between the antenna and then to each radio? tnx, Ralph W4XE If you are able to lose = - 6 db of the signal to each receiver you could use a passive device which you can build yourself and save many many dollars. There is pleny of information on the web on a 4-port Wilkonson divider . The same phasing harness is used for a 4-stack dipole array so you could ask around for one or buy it off the shelf-these are frequenct contious. Regards Bradley Glen ZS5WT http://members.harc.org.za/zs5wt It's easy! What you need is known as a multicoupler. This unit usually comprises a preselector to limit the bandwidth of the incoming signals, a low-noise amplifier, and a splitter with two, four, or eight output ports. The gain of the amplifier is tailored to the number of splits so that the loss in the splitter is overcome. 73, Eric Lemmon WB6FLY - From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Vincent Caruso Sent: Sunday, December 18, 2005 1:04 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Multiple receivers one antenna ??? I would like to install one antenna for four link receivers. How complicated is this? What do I need to do this? Thanks in advance Yahoo! Groups Links 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/
RE: [Repeater-Builder] Re: TE Systems Amp Stories...
Skipp, I have a commercial paging amp on my 147.16 repeater, it has been working flawlessly for over a year now and makes more power than I ever need! I have not had a technical service problem yet, don't know what I would do for sure if I did but they are straight forward amps. When I got the amps they were on 158 MHz, they tuned right up on 147 with no padding or modifications. The transistors are marked with a (I believe) a Motorola part number so they can be purchased at one of the RF transistor places. I hate it when I hear of a good product with poor sales or repair services. Sorry, I lied. I did add one modification, a fan directly on top of the heat sink. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of skipp025 Sent: Monday, December 19, 2005 11:21 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: TE Systems Amp Stories... I've heard a number of these stories about TE Amplifiers. When times were really flush, TE's Amateur Amplifier line was very secondary to their commercial core amplifier products. Now times are a bit more lean and I see them advertising again in QST Magazine and other places. The rub is many Hams also work in the commercial side of radio and most of us (who made it through the 70's and 80's with some brain cells left intact) can pretty much remember being treated bad. Most every business is guilty of a dropped ball every once in a while but TE seems to make a regular go of poor customer service. Their products and quality are really first rate, but that doesn't make up for a lot of bad service. On-going bad service doesn't get the bills paid. cheers, skipp Maire-Radios [EMAIL PROTECTED] wrote: Got a UHF amp from them about 2 years ago. was to be 150 watts output with 5 watts in. Gave them all the info even the freg we wanted it tuned to. When it came in is put out 134 to 137 watts with the 5 watts in. Called a number of times but no call back. not sure if they still make product. Went back to Vocom for all of our amp. You get what you pay for with them and no problems. John Yahoo! Groups Links 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/
Re: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23
In analog, you can still receive a weak signal ... some snow but still watchable. Digital TV will allow to watch either a completely readable signal ... or nothing at all. Neil - WA6KLA Jim B. wrote: Mathew Quaife wrote: They don't want to be an accessory store, unless it deals with batteries, video cables, cell phones and accessories, etc...they won't carry it. Believe it or not, they are even downsizing on the tv antenna's and home phone accessories. I found out that most everyone seems to be cutting back on carrying TV antennas. It's tough to find one lately. Which will be interesting when this DTV crap takes over and people find out they need an outside antenna now to get around the digital breakup (which is untolerable compared to the occasional noise on analog.) -- Jim Barbour WD8CHL 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/
Re: [Repeater-Builder] Re: Multiple receivers one antenna ???
At 12:29 PM 12/19/2005, Coy Hilton wrote: It may sound interesting (and cheap) but the reason that no one else has suggested it is because the impedance miss matches it causes. That is why you need something like a multicoupler whis is first a pre amp to keep the loss to a minimum then sends the pre amp to a splitter that maintains the 50 ohm match required by the receivers on each output port. You can handle the impedance matching by using 1/4 wave sections of 75 ohm coax between the receiver input and the T. The 1/4 wave 75 ohm section steps the 50 ohm receiver input impedance up to 100 at the other end, two of those in parallel at the T gets you back to 50 to match the feedline. Any number of receivers other than 'powers of 2' is more complicated. This does nothing for the loss of course. Roger Grady K9OPO 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/
[Repeater-Builder] Re: Multiple receivers one antenna ???
--- In Repeater-Builder@yahoogroups.com, Roger Grady [EMAIL PROTECTED] wrote: At 12:29 PM 12/19/2005, Coy Hilton wrote: It may sound interesting (and cheap) but the reason that no one else has suggested it is because the impedance miss matches it causes. That is why you need something like a multicoupler whis is first a pre amp to keep the loss to a minimum then sends the pre amp to a splitter that maintains the 50 ohm match required by the receivers on each output port. You can handle the impedance matching by using 1/4 wave sections of 75 ohm coax between the receiver input and the T. The 1/4 wave 75 ohm section steps the 50 ohm receiver input impedance up to 100 at the other end, two of those in parallel at the T gets you back to 50 to match the feedline. Any number of receivers other than 'powers of 2' is more complicated. This does nothing for the loss of course. Roger Grady K9OPO It's called a Wilkinson splitter. Here is a link to some of the theory. http://www.microwaves101.com/encyclopedia/Wilkinson_splitters.cfm 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/
[Repeater-Builder] Re: Q: TE systems amps info needed
Well I didn't scan in the 220 page. But here is what is says for the 2210RA.. Continuous duty, rack mount, high power amplifers. Cooling is forced air (dual redunant fans) 222-225 MHz 5-10 Watts in / 130 watts out 5x19x15 $598 These are all about 1 MB a piece: http://24.208.20.120/web/TE-Systems-VHF_Amplifiers.pdf http://24.208.20.120/web/TE-Systems-UHF_Amplifiers.pdf http://24.208.20.120/web/TE-Systems-Price_List.pdf --- In Repeater-Builder@yahoogroups.com, KA9QJG [EMAIL PROTECTED] wrote: By any chance dos anyone have the Info on the TE SYSTEMS 2210RA 220 Repeater Amp. Happy Holidays to All Thanks Don KA9QJG 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/
RE: [Repeater-Builder] Re: Multiple receivers one antenna ???
It's called a Wilkinson splitter. Here is a link to some of the theory. I don't think it's fair to call it a Wilkinson without a resistor across the output ports. A real Wilkinson provides port-to-port isolation due to the addition of the resistor. A tee and 75 ohm cables doesn't provide any appreciable isolation; it's just two transmission line transformers teed together to yield a proper match assuming that the ends of the cables are terminated into 50 ohm loads. In the real world, receivers don't have 50 ohm Z across a wide range due to front end filters and other factors, so you may end up with additional loss (above and beyond the theoretical 3 dB power-dividing loss) due to the lack of isolation between receivers. --- Jeff 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/
RE: [Repeater-Builder] Re: Multiple receivers one antenna ???
You can handle the impedance matching by using 1/4 wave sections of 75 ohm coax between the receiver input and the T. The 1/4 wave 75 ohm section steps the 50 ohm receiver input impedance up to 100 at the other end, two of those in parallel at the T gets you back to 50 to match the feedline. Any number of receivers other than 'powers of 2' is more complicated. This does nothing for the loss of course. Roger Grady K9OPO The math works in the case of the tee being at the antenna connection, but the ASCII drawing that accompanied the previous email put the tees on the backs of the receivers, sort of like old-style thin Ethernet 10base2, except instead of having terminations at the ends of the backbone, one end is connected to the last receiver, and the other end is connected to the antenna. Matching goes out the window with this design. The problem with even doing the tees with odd quarterwave 75 ohm transformers is that you have virtually no isolation between receivers. If your receivers have tight front ends, unless all of the receivers are very close in frequency, you may end up with more than 3 dB of theoretical loss due to phase cancellation back at the tee. If you're really pinching pennies, Kevin's recommendation of using 75 ohm CATV/MATV splitters is better since they provide port-to-port isolation, and the losses due to the impedance mismatch (50 versus 75) are insignificant (theoretically approx. 0.4 dB + normal dividing loss). --- Jeff 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/
Re: [Repeater-Builder] Still Wanted - Motorola KXN1052 Ch Elements
kevin i always suspected tha the channelements were interchangeable. i knew the motran uhf receive element could work in a micor. it made sense that they would be interchangeable but you could never get anyone at motherola to tell you which was and what with and like that there... happy happy holidays. mdm ted Ted Bleiman K9MDM MDM Radio Ltd - 1629-B N. 31 st Ave Melrose Park, IL 60160 708.681.0300 fax 708.681.9800 web http://www.mdmradio.com - Check it now!! __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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: Q: TE systems amps info needed
I have TE 2210RE here. if that would help Ron On 18 Dec 2005 at 23:44, KA9QJG wrote: By any chance dos anyone have the Info on the TE SYSTEMS 2210RA 220 Repeater Amp. Happy Holidays to All Thanks Don KA9QJG Yahoo! Groups Links 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/
[Repeater-Builder] Old duplexer tuning question
I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? Also, I am curious if I need to use the same high frequency and low frequency ports which would be the opposite for ham radio out here, or if I need to keep the transmitter port for the transmitter and the receiver for the receiver. I should really know all of this but the memory is fading. td wb6mie 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/
Re: [Repeater-Builder] Old duplexer tuning question
At 02:59 PM 12/19/2005 -0800, you wrote: I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? Also, I am curious if I need to use the same high frequency and low frequency ports which would be the opposite for ham radio out here, or if I need to keep the transmitter port for the transmitter and the receiver for the receiver. ---Yes, you want to keep the same frequency relationship between the hipass and lowpass ports. In other words, if it was Tx high and Rx low before and that's upside down from your needs, you'd connect your Rx to the Tx port and your Tx to the Rx port. Also, it sounds like you made the common mistake of cavity tuning, in that you didn't guarantee a 50 ohm load at each port (you didn't say HOW you tuned 'em but I suspect you didn't use 50 ohm pads on both ports when you did). Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
Re: [Repeater-Builder] Old duplexer tuning question
I've got three of them. They're great! There's definitely a low-side and a high-side. You want to maintain that orientation regardless of which side is used for transmit or receive. The duplexer doesn't care - it'll handle 350 watts either way. If you orient the unit with the notch screws and connectors closest to you, or down towards the table, the LEFT side goes to the receiver (usually the higher frequency), and the RIGHT side goes to the transmitter (usually the lower frequency). High/Low refers to commercial repeaters; amateur ones can be oriented either way - mark the sides HIGH and LOW and connect your receiver and transmitter appropriately. The RG214 coax jumper lengths are critical. For 440-470 MHz, there are four that are 11-1/2 inches long and two that are 12 inches long. The two longest ones go from the TEE connector to the center-most N jacks, and the others go between the various sections. I received tuning instructions via e-mail from RFSystems some time ago. They don't really support these old things in a user-friendly self-serve way. As far as tuning goes, separate all the sections and tune each one. Do the bandpass first, then the notch. Make sure the notch tuning doesn't change as you tighten the locking nut. You should get about 0.5dB bandpass loss and at least 35-40dB rejection loss per section. When finished, cable it all up properly and you should be good to go. No further tuning should be required. I use a spectrum analyer with a tracking generator. I haven't seen any difference in tuning if I use 6-12dB pads in series with the input and output, but your equipment may need them if it doesn't present a 50 ohm impedance. I also use a return loss bridge, and a very good dummy load, to adjust the bandpass tuning. This gives a very sharp notch when the resonant frequency causes a 50 ohm impedance; this notch is just as sharp as what you'd get when adjusting the notch tuning on the duplexer itself. Make sure all of your cables are good. The old clamp-style male N connectors can become loose and bits of braid can get lodged inside the connector. A new set of RG-214 cables from RFSystems costs $250 (I had to buy one set) and uses crimp-on N connectors. For all that money, you don't get a new TEE connector with the cable set! Hope this is enough to get you through it. Bob M. == --- tony dinkel [EMAIL PROTECTED] wrote: I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? Also, I am curious if I need to use the same high frequency and low frequency ports which would be the opposite for ham radio out here, or if I need to keep the transmitter port for the transmitter and the receiver for the receiver. I should really know all of this but the memory is fading. td wb6mie __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/
RE: [Repeater-Builder] Old duplexer tuning question
I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? 526's usually tune up pretty straightforward. If it's an older 526, it may have RG-8 interconnects, which can get noisy (better to replace with RG214). As far as tuning the notches, they are generally a PITA to tune to begin with due to the mechanical design (almost as much fun as Motorola T1504's), but as far as tuning them up separately and then putting it back together and having it not work right, I can't say that I've seen that effect, but then again, that's not how I would tune it. You can get in the ballpark by doing it that way, but in the end, you'll need to look at return loss to know when the pass is really tuned right, and you may need additional amplification to really see the notches, since when it's properly tuned, notch depth will be over 100 dB (although if yours has RG8 interconnects, you may not realize that kind of notch depth). In fact, if yours has RG8, it wouldn't suprise me if some of the problems you're fighting are related to cable leakage coupling. Just to confirm, the one you've got was the 440-470 split model, right? If not, then the cable lengths will be wrong and you can expect to see problems like you're experiencing (notches won't line up, insertion loss high, etc.). As always, isolate your test equipment from the DUT with pads when tuning. Also, I am curious if I need to use the same high frequency and low frequency ports which would be the opposite for ham radio out here, or if I need to keep the transmitter port for the transmitter and the receiver for the receiver. The 526 is symmetrical - you can use either side for high pass or low pass. --- Jeff 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/
Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics
At 03:55 PM 12/19/2005 -0600, you wrote: It looks like just a bad amp design as the transistor has the collector commen to the case, putting RF on the Heatsink. the heat sink seams to form a capacitor between it and the shield so any movement or heating modulates the signal. ---Modulates it AM wise? Cause there ain't no way it could modulate the signal FM wise.. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
[Repeater-Builder] Re: Old duplexer tuning question
tony dinkel [EMAIL PROTECTED] wrote: I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? The single vs series adjustments will be different. It would be a pain in the fanny to make the adjustment without a spectrum analyzer with a tracking generator. I tune each cavity, then sum the cavities and readjust the notches, which move quite a bit from the original single cavity position. Once you get the notches in line... firmly secure the notch position adjustment screws and threaten people with early demise should they touch them again. cheers, skipp 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/
Re: [Repeater-Builder] Re: Old duplexer tuning question
Tony: If you are dealing with a bandpass-band reject duplexer, it is usually true that notches will move with the pass cavity. The pass cavity will tune very broad and the notches tune very sharp. Trying to line up all the notches is difficult. Tuning the pass is easier. One technique I use is to try to line up all the passes after summing them (individually tuning them to pass before summing if you can), then individually tune the notches, then redo the pass cavities, then back to the notches. When I am sure that they are close as they can be, interactively, I then adjust the pass cavity to adjust the notch to maximum depth. The bandpass is generally broad enough that the slight movement to fine tune the notch doesn't change anything else very much. I tuned up a Phelps Dodge 6 cavity bp-br VHF 600 Khz split duplexer many years ago and still use it successfully on my repeater. I have tuned up a variety of other duplexers also. I hope this is helpful. Micheal Salem N5MS skipp025 wrote: "tony dinkel" [EMAIL PROTECTED] wrote: I have been pulling my hair out (I don't have that much more to go) over an old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to tune properly one by one but when I put it all back together it just does not seem to sum out right. Is there a procedure someone can point me to? The single vs series adjustments will be different. It would be a pain in the fanny to make the adjustment without a spectrum analyzer with a tracking generator. I tune each cavity, then sum the cavities and readjust the notches, which move quite a bit from the original single cavity position. Once you get the notches in line... firmly secure the notch position adjustment screws and threaten people with early demise should they touch them again. cheers, skipp 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.
[Repeater-Builder] RVS8 Voter Help needed.
Is there anyone on the reflector that is well versed with the RVS8 voter system? I am in the process of getting the voter hooked up, and am missing the COR out of the voter back to the repeater. I have all states active HI, cor from my receiver is active high, the channel is not disabled, but I get no voltage out of the RVS8, I am getting 12 volts into the RVS8, at current I am on channel three. On the connections going to the repeater, I have the common ground tied to ground, my audio line going to the audio input. There is three other connections, the first is labled N/O , the second is N/C and the third is labled Com, and none of the three provides a voltage out. When I key up the receiver, the relay in the RVS8 does engage, but the volt meter gives no voltage out of any of the three connections going to the repeater. Anyone able to help. Mathew N9LV 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/
[Repeater-Builder] Re: Old duplexer tuning question
All, thanks very much for the input. I was already in the process of rebuilding the interconnects to RG-214 with crimp on RFS connectors as a punt. That old RG-8 was hard as a rock. I also think my problem with the notches is that I do not have enough dynamic range on my ifr 1600 to see the bottom. It works ok on the individual cavities but once I combine the whole circuit thats when it mushes out. I think I will get this thing knocked out in the morning. This place is getting dark and cold. Thanks, td wb6mie 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/
[Repeater-Builder] Re: RVS8 Voter Help needed.
Mathew, The RVS-8 does not provide a voltage output. There are two ways to connect it. The easiest is with the relay. It's a SPDT relay with the three contact connections coming out the back to the terminal. The NO is normally open with the Common and the NC is normally closed with the common. Depending on what you want to see, you wire the relay contacts accordingly. If you want a ground on COR, connect the COM to ground and the NO is your output. If you want +12 output when the COR is active, put +12 on the COM and you will get +12 on the NO when the COR is active. The relay gives you the most amount of flexability with many wiring possibilities. The other way is the COR out (from the PC board). It's an open collector transistor that goes to ground when the COR is active. This one is 10 mSec faster, but has less configurations (only one). Dwayne Kincaid LDG Is there anyone on the reflector that is well versed with the RVS8 voter system? I am in the process of getting the voter hooked up, and am missing the COR out of the voter back to the repeater. I have all states active HI, cor from my receiver is active high, the channel is not disabled, but I get no voltage out of the RVS8, I am getting 12 volts into the RVS8, at current I am on channel three. On the connections going to the repeater, I have the common ground tied to ground, my audio line going to the audio input. There is three other connections, the first is labled N/O , the second is N/C and the third is labled Com, and none of the three provides a voltage out. When I key up the receiver, the relay in the RVS8 does engage, but the volt meter gives no voltage out of any of the three connections going to the repeater. Anyone able to help. Mathew N9LV 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/
Re: [Repeater-Builder] Re: RVS8 Voter Help needed.
Hi Dwayne, thanks for the tip, that took care of the problem, now I can go on to hooking up the additional receivers.Mathew ldgelectronics [EMAIL PROTECTED] wrote: Mathew,The RVS-8 does not provide a voltage output. There are two ways to connect it. The easiest is with the relay. It's a SPDT relay with the three contact connections coming out the back to the terminal. The NO is "normally open" with the Common and the NC is "normally closed" with the common. Depending on what you want to see, you wire the relay contacts accordingly. If you want a ground on COR, connect the COM to ground and the NO is your output. If you want +12 output when the COR is active, put +12 on the COM and you will get +12 on the NO when the COR is active.The relay gives you the most amount of flexability with many wiring possibilities.The other way is the COR out (from the PC board). It's an open collector transistor that goes to ground when the COR is active. This one is 10 mSec faster, but has less configurations (only one).Dwayne KincaidLDG Is there anyone on the reflector that is well versed with the RVS8 voter system? I am in the process of getting the voter hooked up, and am missing the COR out of the voter back to the repeater. I have all states active HI, cor from my receiver is active high, the channel is not disabled, but I get no voltage out of the RVS8, I am getting 12 volts into the RVS8, at current I am on channel three. On the connections going to the repeater, I have the common ground tied to ground, my audio line going to the audio input. There is three other connections, the first is labled N/O , the second is N/C and the third is labled Com, and none of the three provides a voltage out. When I key up the receiver, the relay in the RVS8 does engage, but the volt meter gives no voltage out of any of the three connections going to the repeater. Anyone able to help. Mathew N9LVYahoo! 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/ __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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] Hamtronics T301 220 exciter Final and microphonics
On Monday 19 December 2005 05:44 pm, Ken Arck wrote: ---Modulates it AM wise? Cause there ain't no way it could modulate the signal FM wise.. Yes AM wise, it varys the output Z which would make a AM signal. We see it on the service monitor when we tap/blow on it. -- Bryan Fields, KB9MCI 18:58:36 up 2 days, 18:05, 2 users, load average: 0.92, 0.91, 0.83 I wonder if I could ever get started in the credit world? 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/
Re: [Repeater-Builder] Re: Old duplexer tuning question
A little spot of hot pink nail polish on the shaft/nut joint will tell you if someone tried to tweak the cans a little..Joe skipp025 [EMAIL PROTECTED] wrote: Once you get the notches in line... firmly secure the notch position adjustment screws and threaten people with early demise should they touch them again. 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/
Re: [Repeater-Builder] Re: Old duplexer tuning question
tony dinkel [EMAIL PROTECTED] wrote: I also think my problem with the notches is that I do not have enough dynamic range on my ifr 1600 to see the bottom. I can't see the bottom on my IFR1500, so I center the sides of the notch that I can see on the center frequency. I figure that the notch is fairly symmetrical, so this should work OK. Joe 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/
[Repeater-Builder] wanted 2 meter vhf engineering repeater
want this type of repeater because it has very low current drain...looking for solar powered site. 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/
Re: [Repeater-Builder] Re: Old duplexer tuning question
New cables will be a lot more flexible, and with RG214's double shield, they should work better too. It's tempting to use the coax and TEE fitting as a handle when picking the unit up - don't do that ! I found that the connectors added exactly 1/2 inch to the cable length PER CONNECTOR, so you would want to cut the coax 1 inch shorter than the final lengths of 11-1/2 and 12 inches. I solder the center pin, rather than crimping it. Not too many analyzers will be able to go down to the 100+ dB that these duplexers are capable of providing. That's one reason why they tell you to tune each section separately. I did find that if I use my signal generator at a fixed frequency, rather than the sweeping tracking generator, I can tune the spectrum analyzer to the same frequency and crank down the filters. I can barely see the sig gen around 120dB down or more, on the final configuration. As others have mentioned, if your equipment does not provide a good 50 ohm impedance, you should use 6-12dB pads on each line connected to the section you're tuning. Of course, adding this attenuation pushes the signal even further down into the noise, but it should not be a problem on any single section. Use as much signal from the tracking generator as possible (i.e. +10dBm or more). The resulting notch from the entire duplexer will appear to be quite wide, even though the individual section notches are quite narrow. Good luck with it in the morning when it's warmer. Bob M. == --- tony dinkel [EMAIL PROTECTED] wrote: All, thanks very much for the input. I was already in the process of rebuilding the interconnects to RG-214 with crimp on RFS connectors as a punt. That old RG-8 was hard as a rock. I also think my problem with the notches is that I do not have enough dynamic range on my ifr 1600 to see the bottom. It works ok on the individual cavities but once I combine the whole circuit thats when it mushes out. I think I will get this thing knocked out in the morning. This place is getting dark and cold. Thanks, td wb6mie __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/
[Repeater-Builder] Re: Tower top preamp
Thanks to all who commented. Sounds like the tower top UHF preamp project will go on hold. I have about 480 feet of 7/8 line and it would be nice to overcome the loss but don't think it's in the budget for a while. Merry Christmas, Al, K9SI 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/
Re: [Repeater-Builder] Digest Number 3504
Vincent, Take everyone's advice about preselectors and preamps with appropriate gain. Then go to ebay and look for Mini-Circuits there. You will find probably dozens of suitable devices, with 2 to 24 or more ports. Many tend to use SMA connectors which are excellent but not everyone can deal with SMA's. If you are lucky you will find those with N's or BNC's. Data sheets are available at mini-circuits.com. Anzak also makes some good commercial quality splitters. Again, these are passive devices so you will probably need some gain up-stream of the splitters. A good thing about the Mini-Circuit splitters is that most have 20 db or more isolation between ports so that what you hook to one port won't adversely affect another port. I had some problems once with two UHF Marti receivers teed to the same antenna where enough of the local oscillator of one would back up into another. Then both receivers would pick up the same signal. Not good. A splitter with decent port isolation cured the problem. Merry Christmas 73, Al, K9SI Date: Sun, 18 Dec 2005 16:03:53 -0500 From: Vincent Caruso [EMAIL PROTECTED] Subject: Multiple receivers one antenna ??? I would like to install one antenna for four link receivers. How complicated is this? What do I need to do this? Thanks in advance 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/
Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics
Ken Arck wrote: At 03:55 PM 12/19/2005 -0600, you wrote: It looks like just a bad amp design as the transistor has the collector commen to the case, putting RF on the Heatsink. the heat sink seams to form a capacitor between it and the shield so any movement or heating modulates the signal. ---Modulates it AM wise? Cause there ain't no way it could modulate the signal FM wise.. Ken Yes it can... FM that is... Kevin 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] Hamtronics T301 220 exciter Final and microphonics
I have a similar problem on the Hamtronics REP-200 6m repeater. It is constantly swamping the receiver. I tried a antenna tuner in the transmitter line as well as the antenna line; trying to make the PA Happy. The TX light will go out,. and there will still be power going through the meter, at a higher SWR. It will occaisionally key the 2m repeater which is about a mile away. When the receiver actually is sensitive enough to produce static with the squelch completely open, you can hear it clearing the runway and preparing to take off as the PA decides to sweep the RF spectrum. Some times it just likes to output power after the exciter drops out. Touching the stud nut on the bottom of the chassis while it is transmitting results in RF burn; so it is no wonder it swamps the Receiver; even with a dummy load on the Duplexer at the antenna port. - Original Message - From: Bryan Fields [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 19, 2005 4:55 PM Subject: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics well I have a T301 on 220 that has some serious power drop off and microphonics issues. I had thought the microphonics were generated in the VCO, and while some of them are, i have traced most down to the final amp. It looks like just a bad amp design as the transistor has the collector commen to the case, putting RF on the Heatsink. the heat sink seams to form a capacitor between it and the shield so any movement or heating modulates the signal. We also have seen the output power go from 4 watts down to 1.2 watts as it heats up. If we put a fan in there the output is stable at about 2 watts, but it modulates the signal with a hum from the moving air. So I was thinking to replace the output transistor with a MRF237 which has the case tied to ground(emitter) which would seam to be a better idea. For the time being we removed the final and are using a small brick amp that puts out 3 watts stable, with no microphonics. So anyone tried this or have a better fix for the issue? -- Bryan Fields, KB9MCI 15:28:02 up 2 days, 14:35, 2 users, load average: 0.85, 0.61, 0.52 Health is merely the slowest possible rate at which one can die. 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/
Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics
On Monday 19 December 2005 09:55 pm, Kevin Custer wrote: Yes it can... FM that is... Well the distortion I am seeing due to the final looks like AM, but then the vco has FM distortion when you tap the board so it's hard to tell. It's a combo of both. How can the Final in this produce FM of it's own, I would think cuz it's a variable cap on the output it would be AM? But still wondering if anyone has changed the transistor out and seen any better results with it. -- Bryan Fields, KB9MCI 22:17:14 up 2 days, 21:24, 2 users, load average: 1.29, 1.16, 1.27 The steady state of disks is full. -- Ken Thompson 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/
[Repeater-Builder] Re: Hamtronics T301 220 exciter Final and microphonics
How can the Final in this produce FM of it's own, I would think cuz it's a variable cap on the output it would be AM? -- Bryan Fields, KB9MCI It's probably PM, not FM Merry Christmas Laryn K8TVZ 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/
Re: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23
At 12/19/2005 08:11, you wrote: Mathew Quaife wrote: They don't want to be an accessory store, unless it deals with batteries, video cables, cell phones and accessories, etc...they won't carry it. Believe it or not, they are even downsizing on the tv antenna's and home phone accessories. I found out that most everyone seems to be cutting back on carrying TV antennas. It's tough to find one lately. Which will be interesting when this DTV crap takes over and people find out they need an outside antenna now to get around the digital breakup (which is untolerable compared to the occasional noise on analog.) Between cable piepan dishes, I assumed that alone would drop the demand for traditional (legacy?) broadcast reception antennas. Bob NO6B 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/
[Repeater-Builder] RCA 700 Series Radios Available
I have available an pile of RCA 700 series rigs, long removed from service. They're probably UHF, but I don't know at this point. Is anyone interested in acquiring any of these for a nominal fee? (read cheap) Thanks, Robin Midgett K4IDC VHF+ Glutton EM66se 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/
Re: [Repeater-Builder] Re: Hamtronics T301 220 exciter Final and microphonics
At 04:36 AM 12/20/2005 -, you wrote: It's probably PM, not FM ---I seriously doubt it. The amount of phase shift (and hence deviation) that could be introduced at the final frequency and from that small amount of reactance has got to be negligible. Don't forget that in both PM and FM schemes, the modulation is done early on and multiplied. So for a typical multiplication scheme of x 9, the modulation introduced only needs to be 550 Hz or so (for a 5 Khz spec). And even a paultry 550 Hz requires a fair amount of audio voltage to accomplish. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
RE: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23
Bob, While the number of folks submitting to sub-standard HDTV is common, those of us who know that none of the DBS and cable providers are sending true 1080i still seek a good quality off-air antenna. At this point in the game, it is the best way to get true high-def. And a whole lot cheaper for better quality pictures than the highway robbery rates that most of us pay for crappy cable. Interesting that we all plunged headlong into technology, only to find that we have been sold out to multi-casting and bandwidth limitations of the cable and DBS systems. How many home shopping channels is enough? Dish-net is sending around 15 of them... yet I need a second dish to get PBS. What is wrong with this picture? I still long for the day when light-pipe is in every home. America is so far behind the rest of the developed world with regard to data delivery, that it just isn't funny anymore. Many nations have multi-megabit access for less than 25% of your average baseline cable bill. The devil is green!! Just follow the money and the truth is evident. Fiber is cheap these days.. so is your congressman.. for sale to the highest bidding lobbyist. Even the radio community has jumped on the multi-casting bandwagon as evidenced by this blurb from the CGC Communicator.. run out of bandwidth.. Hey, let's invent some more of it. Truly marketing at it's best!! ** CONSUMERS PREFER EXPANDED BAND MULTICAST CHANNEL DISPLAY In a study for Cox Radio, consumers were asked to consider two possible options for displaying multicast radio channels. Currently, and possibly for the next few years, HD Radios will display multicast channels with the parent station's frequency followed by the sub-channel number (e.g. 88.1 HD2 88.1 HD3). However, 90% of the consumers surveyed preferred the expanded band option of display where multicast channels appear as if they were being broadcast above 107.9 MHz. For example, 88.1 HD2 could be displayed as 108.1 MHz. How these make- believe frequencies will be assigned, and by whom, remains to be seen, but the idea has strong consumer appeal. http://www.rwonline.com/dailynews/one.php?id=8195 ** Most end-users have no idea what they are signing-up for... Sad, but true.. most consumers are stupid. Capitalism is alive and well... just look at how horribly Tesla and Armstrong were treated because they were visionaries. Not just interested in making a buck... does anyone see a parallel here? Editorial mode off.. for now.. mike - Mike PerrymanCavell, Mertz Davis, Inc. [EMAIL PROTECTED] Consulting Engineers http://www.cmdconsulting.com 7839 Ashton Avenue K5JMP Manassas, VA 20109 USA (703) 392-9090; (703) 392-9559 fax; DC Line (202) 332-0110 - -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Tuesday, December 20, 2005 12:06 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Radio Shack 10% Off Coupon good to 12/23 At 12/19/2005 08:11, you wrote: Mathew Quaife wrote: They don't want to be an accessory store, unless it deals with batteries, video cables, cell phones and accessories, etc...they won't carry it. Believe it or not, they are even downsizing on the tv antenna's and home phone accessories. I found out that most everyone seems to be cutting back on carrying TV antennas. It's tough to find one lately. Which will be interesting when this DTV crap takes over and people find out they need an outside antenna now to get around the digital breakup (which is untolerable compared to the occasional noise on analog.) Between cable piepan dishes, I assumed that alone would drop the demand for traditional (legacy?) broadcast reception antennas. Bob NO6B Yahoo! Groups Links 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/
Re: [Repeater-Builder] Re: Hamtronics T301 220 exciter Final and microphonics
On Monday 19 December 2005 11:48 pm, Ken Arck wrote: Don't forget that in both PM and FM schemes, the modulation is done early on and multiplied. So for a typical multiplication scheme of x 9, the modulation introduced only needs to be 550 Hz or so (for a 5 Khz spec). And even a paultry 550 Hz requires a fair amount of audio voltage to accomplish. In most PLL units I have worked with in the ham market the vco is modulated directly on the loop op amp. There in no multiplication the VCO runs at the output frequency. As to the origional question, anyone fixed the microphonics problems with the exciter? -- Bryan Fields, KB9MCI 01:07:04 up 3 days, 14 min, 2 users, load average: 0.31, 0.23, 0.26 Somewhere in DOWNTOWN BURBANK a prostitute is OVERCOOKING a LAMB CHOP!! 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/
