[Repeater-Builder] PA brick
I have an NEC module type MC-5842, does anyone have any data on this part as Google etc, have failed to provide any.It is dated 1983 ! Regards Andy G3UEQ
RE: [Repeater-Builder] Re: newbie
Thanks Randy Trouble is I live in a flat area and the only hill at 600 feet, they want $4500 per year, it used to be $100 ! We have a friendly taxi firm with a 60 foot tower and we might be able to get that, but the range on 70cms works out at around 12 miles!! Andy From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb8art Sent: 16 July 2009 8:34 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: newbie Welcome Andy and yes a lot more harder these days to get a good site. Randy --- In Repeater-Builder@yahoogroups.com <mailto:Repeater-Builder%40yahoogroups.com> , "Andy Hearn" wrote: > > Hi Everyone > > Just found this group from repeater-builder site. Run GB3CC, but off air due to loss of commercial site due to increased rent etc. > Hoping to get CC back on air soon, just have to acquire some more cavities, and negotiate a new site ! > GB3CC is (was) running a Vertex VXR-5000 with G8CUL logic. > > Regards > Andy G3UEQ > <><>
[Repeater-Builder] newbie
Hi Everyone Just found this group from repeater-builder site. Run GB3CC, but off air due to loss of commercial site due to increased rent etc. Hoping to get CC back on air soon, just have to acquire some more cavities, and negotiate a new site ! GB3CC is (was) running a Vertex VXR-5000 with G8CUL logic. Regards Andy G3UEQ
[Repeater-Builder] Re: Re Circulator
Eric / Don Mine is a 3 port Circulator/isolator, I tuned it up on sig gen with 50 ohm pads and UHF rx with 50 ohm pads as detector, rotating it round a few times to optimise receive port isolation, I was getting around 65 dB isolation between TX port (1) and RX port (3), insertion lost TX port (1) to antennae port (2) less than 0.5db, ant port (2) to rx port (3) less than 0.5db..happy with that, as I said it works well, but just wondered why on site tuning was flat. I appreciate the traditional way the unit works as you have described, I would like to try your way but my shift here is 1.6MHz and I do not have a duplexer for that sort of spacing ( although after the isolator, my cavs do a good job. Also Don, appreciate offer, but do have test gear at home to do it in passive mode so to speak. rgds Andy > My understanding of British radio terminology is not complete, so I am a > little confused by your statement about the "receive" port of the > circulator. > > In circulator (isolator) applications I am familiar with, the input of > the circulator connects directly to the transmitter output, the output > of the circulator connects to the TX input cavity of the duplexer, and a > 50 ohm load is connected to the "side" connector. Once the three > capacitors (or six, on a dual circulator) have been adjusted on a > network analyzer with the loads that will be used in service, there > should be no reason to "tweak" any of the adjustments. In fact, I have > been able to improve the performance of a circulator that was originally > tuned with loads that were very close to 50 ohms, but was installed with > loads that were between 51 and 53 ohms. This is one tuning job that a > network analyzer can perform to a "gnat's eyelash!" > > If you were able to improve your repeater's operation by "tweaking" the > circulator, I suggest that a better solution might be to tune your > antenna and/or your duplexer to 50 ohms. It might be an interesting > project to install a simple impedance matcher (Z-matcher) between the > duplexer and the antenna. It's not clear where each component in your > repeater system is installed, so perhaps you can elaborate on the > arrangement? Specifically, where is the circulator installed? Thanks! > > 73, Eric Lemmon WB6FLY > > Andy Hearn wrote: > > > > HI > > I have just changed my 70 cm repeater antenna over to a co-linear 8 > > dBd gain, was running 2 full wave dipoles stacked (reason..antenna > > faults and not able to mount with correct vertical spacing). > > > > When I was calibrating the circulator on the bench, all set up > > perfectly, with the receive port being sharp in its setting. > > > > On site since the antenna was running a slightly higher VSWR > > compared to a dummy load (1.2:1), I thought it might be an idea to > > just tweak the receive port to optimise the rejection. However I > > found the tuning to be very flat, question, is this normal or am I > > missing something? > > 73 > > Andy G3UEQ > > > > > > 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 Circulator
Hi Russ Not running a duplexer, circulator feeds into seperate rx/tx cavities, this arrangement has been used on several UK repeaters, the circulator is a 3 port ferrite unit. Sensitivity appears to be good but I was just curious to see if it could be improved and noticed this anomaly. Regards Andy - Original Message - From: "russ" <[EMAIL PROTECTED]> To: Sent: Thursday, October 07, 2004 9:57 PM Subject: Re: [Repeater-Builder] Re Circulator > > Should not your circulator be on the transmit side before the duplexer? > All of mine are. > 73 Russ, W3CH > 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 Circulator
Hi Russ Not running a duplexer, circulator feeds into seperate rx/tx cavities, this arrangement has been used on several UK repeaters, the circulator is a 3 port ferrite unit. Regards Andy - Original Message - From: "russ" <[EMAIL PROTECTED]> To: Sent: Thursday, October 07, 2004 9:57 PM Subject: Re: [Repeater-Builder] Re Circulator > > Should not your circulator be on the transmit side before the duplexer? > All of mine are. > 73 Russ, W3CH > 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 Circulator
HI I have just changed my 70 cm repeater antenna over to a co-linear 8 dBd gain, was running 2 full wave dipoles stacked (reason..antenna faults and not able to mount with correct vertical spacing). When I was calibrating the circulator on the bench, all set up perfectly, with the receive port being sharp in its setting. On site since the antenna was running a slightly higher VSWR compared to a dummy load (1.2:1), I thought it might be an idea to just tweak the receive port to optimise the rejection. However I found the tuning to be very flat, question, is this normal or am I missing something? 73 Andy G3UEQ 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: Re Vertex VXR-5000
Thanks Randy Will check it out Andy G3UEQ --- In Repeater-Builder@yahoogroups.com, "Randy & Karen Long" <[EMAIL PROTECTED]> wrote: > There is also a group for Vertex repeater and radio owners on Yahoo Groups. > That may be a good resource too. > > Randy,W0AVV 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: Re Vertex VXR-5000
Thanks Mark I'll check it out..appreciate Regards Andy --- In Repeater-Builder@yahoogroups.com, "Mark Holman" <[EMAIL PROTECTED]> wrote: > I don't know about the VXR-5000 but I have noted some software on e- Bay > weather this seller has your particular needs or not. Yeasu / Vertex / > Standard may charge a high price. I did find a Russian web site > http://www.hackersrussia.ru/Radio/m_vertex.php > 1st. Download, by the way make sure you download a file to convert Russian > to English. > > just found it via Google Search. > > 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 Vertex VXR-5000
Hi Everyone New to group, appears to be one of the most prolific groups I have come across. I need some help, just acquired a VXR-5000 without programming lead / interface. Does anyone have the circuit / connections software so I can get it programmed for my local repeater frequencies etc. Regards Andy G3UEQ 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/
