[Repeater-Builder] Portable repeater and RSSI issues
Repeater Power output being a function of RSSI...Have another think on this one ... What about all the other mobiles or handhelds that could be in fringe or poor coverage areas, what will happen to their repeater reception if suddenly the repeater power is suddenly dropped at the expense of a high powered mobile. This feature is sometimes utilised on the Portables or mobiles if the system is relatively balanced (5W repeater, 5W portables)... But never on the repeater for above reasons.This feature is good at saving battery life for the portables, but the repeater should be specified for this anyway. The best repeaters are simple, and simple to use This is how I tackled the portable repeater problem for our emergency services: http://www.signals.net.nz/contributed/documents/VXP-820brochure.pdf Just my 10c worth. Regards to all Gareth Bennett - Original Message - From: vhsproducts To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 05, 2009 5:08 PM Subject: [Repeater-Builder] Re: Portable repeater Thanks for all the great input! I agree that it would be a lot easier to manage a portable repeater as a UHF station,or UHF/VHF cross band, but the VHF mode is a hard and fast requirement of my clients that want a truly portable repeater. Just to clarify a couple of points, I won't be converting commercial or ham radios to fit inside an ammo can with an off-the-shelf controller. This is pretty much a ground-up project, and we will build the whole unit including the RF sections and the controller. I especially like the idea of power output being a function of the RSSI-very intriguing! Power is clearly going to be a problem, and rechargeable batteries, while economical, are not so wonderful on power to weight ratios. In my first generation digipeater, I had a 10 Watt transceiver in a package about the size of a handheld radio (A pelican 1030 case) including a pack of 8 AA alkaline batteries. It had a service life of about 24 hours. Of course, the operational intervals are much different than voice repeaters; a typical transmission is about 300 ms long, but they happen very frequently, about once every three seconds on the average. I will plan on making the enclosure ( almost certainly a Pelican Case of some variety) based on having a planned field battery life of at least 24 hours, with an auxiliary input for a piggy backed power supply. Experimenting with a 300 mW repeater, I found that I could have six inches of antenna separation with a 600 KHz split, but the antennas had virtualy no gain, and not too many people are going to want a 1/3 Watt repeater! ( yes, I know that having antennas within 6 inches is not a good thing, but my bench is to small to really separate them!) Considering that I am going to have to have a bit of antenna separation, I am also thinking about having the transmitter and amplifier in a separately powered module, and having the receiver and controller in the main case, along with batteries. This will keep me from having to carry massive quantities of heavy coax cable: the control cable between the units just needs to be heavy enough to resist damage. Things I have absolutely ruled out are having a duplexor (denies us frequency agility) Marine deep cycle batteries ( you need a forklift to deliver them!) and ammo cans, steel cases, or other stuff to heavy to walk up a hill with. More gee-whiz ideas are being able to remotely turn the unit into a simplex repeater ( although I truly hate them) and be able to monitor the talk frequency for APRS and ax.25 packets, and shoot them out over the APRS network channel. My design goal is to go as small and light as possible with a 24 hour service life, and robust enough to survive field deployment. Like all designers, I have to kick myself occasionally to prevent myself from over-complicating what should be a very simple tool. If I can make it work, I would very much like to work on a next-gen unit with a few more bells and whistles, but still cheap enough to fit into a hans budget, and not requiring a team of sherpas to carry around. once again, thanks for all your great ideas! Allen AF60F www.byonics.com
Re: [Repeater-Builder] Re: Portable repeater and RSSI issues
Hi Allen, Yes, It's hard pleasing everyone :-) Yes the repeater is based on Vertex product. Easy for us to do as we distribute for New Zealand and have the Engineering support from Japan. Interestingly enough it was the internal battery that dictated the specifications of our PRU, which is an 18Ah SLA, hence the weight and form factor. We could have gone to smaller batteries but at the expense of talk time, so another compromise. Radios and Duplexer are relatively minimal, but everything still is a tight squeeze. We supply an end fed 1/2 wave that goes with the kits, this is terminated via an N connector, giving the user access to other aerials if necessary. Nothing beats a good project like a PRU Regards Gareth Bennett - Original Message - From: vhsproducts To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 06, 2009 10:40 AM Subject: [Repeater-Builder] Re: Portable repeater and RSSI issues Gareth, I like your portable repeater! Is it Yeasu/Vertex based? I agree that an RSSI controlled repeater could be problematic for outlying areas, so if it was implemented, we would want to take careful steps to make sure it was appropriate. My thinking was that the relatively small footprint served by a portable repeater with marginal antennas and low power output might militate towards limiting the power. Of course, any low power units trying to hit the repeater would tend to make it vote towards higher power output, so maybe the wisest course would be to just set a fixed power, or offer the repeater owner remote power level control. I am trying to make a unit significantly smaller and lighter than your 22 pound machine, so power savings is going to be an issue! Allen VHS AF60F
Re: [Repeater-Builder] Portable repeater
Packaging, ease of use and battery life are way up there on the list. Without addressing these issues, It's just another portable repeater Have a look at this. This is what we made for Emergency services http://www.signals.net.nz/special_offers/ Either VHF or UHF. Regards Gareth Bennett
Re: [Repeater-Builder] HT750 vs CP200
Have you considered the Vertex Standard VX-821?
Re: [Repeater-Builder] Dual Receive Antennas
Put the yagi at the critical station location :-) Regards Gareth Bennett
Re: [Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together
Hi Ian, How about building a 3 way 600Z resistive bridge with 7x 220R resistors, feeding each TX into two of the three ports and utilising the last port for either RX1 or RX2, which is switched into the remaining port via the active RX COS control driving into a DPST relay to select the active RX? ... Simple and it works . Cheers Gareth Bennett From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Saturday, June 13, 2009 12:31 AM Subject: [Repeater-Builder] Circuit diagram for interfacing 2 maxon pm150 repeaters together Would anyone have a simple diagram for joining 2 separate maxon sm4450 repeaters together in real time I.e. Rx1 --+---tx1 I Rx2--+tx2 So what is received from rx1 transmitts to tx1 and TX 2 and what is received from rx2 goes over tx1 and tx2 Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
[Repeater-Builder] O.T Faulty Anritsu Sitemaster Advice.
Hello Group We have an Anritsu S331B Sitemaster that has possibly had excessive RF, which has caused the dreaded Integrator failure according to the power on self tests. My question to the collective wisdom of the group...Does anybody recommend an honest service/repair facility that can repair the front end of my machine, or is there any information on repairing the unit, service manuals etc so that we could repair this in-house. This has re-enforced the lesson that never lend out either your test equipment or your wife! All advice and suggestions welcome Regards Gareth Bennett
Re: [Repeater-Builder] Six-Meter Isolator Circulator
Hi Dan, Have a look at this link, exactly what you are after?? http://www.trademe.co.nz/Electronics-photography/Radio-equipment/Commercial/auction-223252310.htm Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 477-4342(64 3 477-4342) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : gare...@signals.net.nz Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised - Original Message - From: Dan To: Repeater-Builder@yahoogroups.com Sent: Monday, June 08, 2009 3:35 PM Subject: [Repeater-Builder] Six-Meter Isolator Circulator Do you know where I can get a reasonably priced isolator or circulator for the six-meter band? I see lots of items for 2 meters, 1.25 meters, and 70 centimeters, but nothing for low band applications. Regards, Dan at K7MM, VU3MMW
[Repeater-Builder] (OT) APCO P25 horror stories anyone?
Hello Group, As P25 is being rolled out worldwide, I have been hearing many stories regarding P25 shortcomings...Such as Vocoder problems in high noise situations, Jitter and Multipath issues from users that have converted from their legacy Analog systems, etc . The repeater issues (If any) are especially interesting for me, and would be very interested in hearing feedback from my colleagues from around the globe. Best regards to all Gareth Bennett
Re: [Repeater-Builder] Asntenna Painting
We just use common household bleach mixture to clean antennas that have been up there for ages, works a treat! Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : gare...@signals.net.nz Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised - Original Message - From: Ralph Mowery To: Repeater-Builder@yahoogroups.com Sent: Tuesday, March 24, 2009 3:36 PM Subject: Re: [Repeater-Builder] Asntenna Painting --- On Mon, 3/23/09, chris Inos chris_i...@yahoo.com wrote: From: chris Inos chris_i...@yahoo.com Subject: [Repeater-Builder] Asntenna Painting To: Repeater-Builder@yahoogroups.com Date: Monday, March 23, 2009, 7:59 PM I am seeking advise ...but if I can be pointed to the right direction, I will be most appreciative. This summer, I plan to take down my Cellwave Station Master (repeater antenna) for service, maintenance or painting. Over the years, moss and algae set in and the bright white fiberglass finish is beginning to disappear. I seek advise on the following: 1. What cleaning agent would be best to take down foreign objects in the antenna 2. What paint if any...or preparation therof before application is neglegible in the optimum performance of this antenna. This antenna has served us well over the years. 3. Other recommendation. thanks chris Here is a file I picked up several years ago. Antenna Painting Instructions The following is courtesy Celwave This is what I received when I asked them for a recommendation of what to use in refinishing my 18 year old PD455 Celwave receives requests for advice about refinishing weathered antenna radomes or changing the radome color for aesthetic reasons. We do not take a position on any manufacturer's paint. However, Sherwin-Williams seems to make a product, which should be compatible with radomes and not interfere with the antenna's electrical performance. The following suggestions are not a substitute for detailed instructions and mix ratios provided by the paint manufacturer. RADOME MATERIAL (Standard Color) CELWAVE PRODUCT LINE 1. Spun Epoxy Fiberglass (Blue) Penetrator Antennas (AxR, BxR Series) 2. Polyester Impregnated Fiberglass (White) Stationmaster Antennas (PDxx Omni Series.) 3. Polyester Impregnated Fiberglass (Grey) FR CELlite Panel Antennas (AP18, 19 Series) 4. ASA (Grey) FR CELlite Panel Antennas (AP90 Series) 5. AES/ABS (White or Grey) US Panel Antennas (Other APxx Models) 6. Gel Coated Fiberglass Tubing (White) Marine Antennas (Cel-1, 3 etc.) Notes: FOR RADOME MATERIAL USE THIS FINISH #1, #2, #3 Primer and Top Coat #4, #5 Primer may be required (Top Coat retention may be tested with adhesive tape after paint dries) #6 Requires Pre-Treat (Acid Etch) to remove gloss, then Primer and Top Coat SHERWIN-WILLIAMS PRODUCTS: Etch P60G2 Wash Primer Primer
[Repeater-Builder] Zetron controller info needed
Happy new year to all on the group! Recently my organisation inherited a large amount of model 49 LTR controllers and the associated Model 2540 FASTnet Switch. I am hoping that some kind individual has a copy of any relevant technical information/manuals or software that they could supply me as the original documentation was lost ages ago when the original operator ceased trading. Any help would be greatly appreciated. Best Regards and thanks for reading. Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : gare...@signals.net.nz Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised
Re: [Repeater-Builder] Tait tb7100 verses tb8100
The TB7100 is only a toy compared to the TB8100 series. Actually the '7100 series is made utilising Tait Mobile boards that dont quite make specification. Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : [EMAIL PROTECTED] Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised - Original Message - From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 11, 2008 8:31 PM Subject: [Repeater-Builder] Tait tb7100 verses tb8100 Hey guys, I have a project where a customer wants to go all tait. Here's the million dollar question, what repeater should we get? What holds up better, the TB7100 or TB8100? Can someone point out the differences? I'm a little new to the tait world. Thanks, Jed
[Repeater-Builder] EM to Ethernet interfaces
Hello Group, We are looking for simple EM to Ethernet Interfaces. Single or Dual channels would be great as we have an application where we would prefer not to install a complete MUX assembly where something that would provide us with 4 Wire Type1 EM to Ethernet would be ideal. I'm looking forward to your feedback and suggestions. Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : [EMAIL PROTECTED] Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised
[Repeater-Builder] EMR Corp UHF cavity filters
Hello Group, Does anybody have a UHF EMR Corp 7 cavity filter (6567 Series) that I could ask some dimensioned from please? Such as coupling loop dimensions etc? I have a heap of 850 MHz 3/4 Wavelength cavities that are surplus and am keen to investigate modifying these to 440 MHz 1/4 Wavelength cans. Any help would be appreciated Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : [EMAIL PROTECTED] Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised
[Repeater-Builder] Zetron Model 49 Trunking controllers for sale
We have some surplus Zetron Model 49 Trunking controllers for sale, These are in As New condition as were set up and then put into storage as service spares that were never utilised. Model: 901-9147 Quantity: 7 Looking at $USD 600 each + Shipping Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : [EMAIL PROTECTED] Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised
[Repeater-Builder] EFJ Viking Base Stations F.S
Greeting group, We have the following E.F Johnson Viking Base Stations for sale: 10x 800 MHz 75 Watt (Immaculate condition) Model:242-2008-X32 Asking $USD $1,800 each Regards Gareth Bennett (Technical Services) Signals NZ Ltd 8 Manor Place P.O. Box 1439 Dunedin 9015 New Zealand Phone : 03 425-0895(64 3 425-0895) Fax : 03 474-5251(64 3 474-5251) Mobile : 027 458-8377 (64 27 458-8377) Email : [EMAIL PROTECTED] Web: www.signals.net.nz Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and any copies of it from your system, and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. LFT Group Ltd reserves the right to monitor ALL e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised
Re: [Repeater-Builder] Re: ROIP interfaces
Hi Walter, Actually we are evaluating ROIP products for a major dealer network where my job is purely RF engineering for OEM compatibility. Granted, I am casting a rather wide net here on a fact finding mission to see if the group is aware of any other brands that I had not covered. As for pricing, we will be dealing at OEM level, so its a volume issue as well as features and performance. In NZ we refer to a trigger base as a semi duplex radio (On Mobile Frequencies) that is mounted at a fixed location. Often these are line controlled via EM, or in our instances ROIP. Hope this helps? Regards Gareth Bennett - Original Message - From: ka1jfy To: Repeater-Builder@yahoogroups.com Sent: Friday, September 26, 2008 7:41 AM Subject: [Repeater-Builder] Re: ROIP interfaces What do you consider a reasonable price? And what features are you specifically looking for them to have? BTW, what is a 'trigger base'? A control station? [I love when IT guys try to do radio] Walter KD7BJJ --- In Repeater-Builder@yahoogroups.com, Gareth Bennett \(Ihug\) [EMAIL PROTECTED] wrote: Hello Group, I am looking for options for ROIP interfaces that can be interfaced to base stations. I am aware of the major brands such as Omnitronics, Telex/Vega, CSI and Raytheon/JPS. Are there any other vendors out there that do a decent stand alone ROIP interface unit at a reasonable price? We are OEM suppliers and are looking for possibly two tiers of unit, one that can provide regenerated CTCSS (High end tier) and a more basic unit for possible trigger base applications that we can integrate into our own systems. Does anybody have any suggestions or recommendations? Wishing you all the very best Gareth Bennett
[Repeater-Builder] ROIP interfaces
Hello Group, I am looking for options for ROIP interfaces that can be interfaced to base stations. I am aware of the major brands such as Omnitronics, Telex/Vega, CSI and Raytheon/JPS. Are there any other vendors out there that do a decent stand alone ROIP interface unit at a reasonable price? We are OEM suppliers and are looking for possibly two tiers of unit, one that can provide regenerated CTCSS (High end tier) and a more basic unit for possible trigger base applications that we can integrate into our own systems. Does anybody have any suggestions or recommendations? Wishing you all the very best Gareth Bennett
