[time-nuts] GPS antenna splitter
I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi The auction sites are great sources of GPS splitters. I've gotten Mini Circuits splitters for much less than what they go for new. All of the ones I've seen do indeed pass DC. One thing to consider - you may want one with an extra port on it. Some GPS cards are a bit sensitive to antenna current. If you gang up seven receivers, one may not see enough drain to turn off the antenna alarm. The simple answer is to terminate one port with a resistor to ground. If you do need to inject DC, they make purpose built gizmos. You can also run one of the Symmetricom splitters that has DC blocking on all but one port. They tend to be expensive. Bob On Jun 29, 2013, at 2:35 PM, Graham planoph...@aei.ca wrote: I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
They pop up on ebay sometimes. On 6/29/2013 2:35 PM, Graham wrote: I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1432 / Virus Database: 3204/5949 - Release Date: 06/29/13 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
You might want to try using a 'power passing splitter' as marketed to satellite TV and Cable TV. there are lots of them on ebay in the neighborhood of $5. As I recall there was a gps splitter project on the web that used a cable splitter and 'bullet' amplifier. If you can live with 4dB loss, you don't have to use the amplifier. Dale NV8U -Original Message- From: Graham Sent: Saturday, June 29, 2013 2:35 PM To: time-nuts@febo.com Subject: [time-nuts] GPS antenna splitter I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
On 6/29/2013 11:35 AM, Graham wrote: I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. Graham, back in the past before I got the 8 way -hp- splitter I now use, I used an MCL ZAPD-2 (SMA connectors) for feeding two GPS receivers, and it worked very well. I left one port intact to feed DC to the antenna from that receiver, and put a small cap in series with the other to block that one. As the second gps connected to that port then complained I added a 220 Ohm R in series with a small choke to ground which lets that receiver think it is powering an antenna. Unmodified, there is a DC connection between all three ports which I think would not be a good idea for two receivers both looking for a powered antenna. If you can find one of these splitters cheaply, it's a very good way to go, but I wouldn't want to pay the new price for one :^) Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi Bob, On 06/29/2013 08:43 PM, Bob Camp wrote: Hi The auction sites are great sources of GPS splitters. I've gotten Mini Circuits splitters for much less than what they go for new. All of the ones I've seen do indeed pass DC. One thing to consider - you may want one with an extra port on it. Some GPS cards are a bit sensitive to antenna current. If you gang up seven receivers, one may not see enough drain to turn off the antenna alarm. The simple answer is to terminate one port with a resistor to ground. If you do need to inject DC, they make purpose built gizmos. You can also run one of the Symmetricom splitters that has DC blocking on all but one port. They tend to be expensive. For GPS receivers needing more DC load, I've found that hooking up a DC load through a SMD inductor in series with a SMD resistor (150 Ohm is what I've used). I hacked that onto a BNC-T and it got a GPS receiver to work. Strange that my hobby-hack is drive-by delivered to one of the major telecom operators, but it solved their problems. :) A splitter should have a pre-amplifier. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi Graham, Unfortunately, when you get the 'disease' 8 antenna probably will be the minimum, I think myself have 7 bullets, A symetricom 12V puckish thing (very good btw) 2 trimble pucks. a hp 58534 integrated RX antenna that weighs about a kilo but has super accurate PPS and a trimble acutime gold (which isn't very accurate at all..) However, I still am in need of more!!! So I found a good solution in a televee's satellite splitter I found in the junk box. Here is how I did it: http://www.vk2hmc.net/blog/?p=159 P.S. I am about to put up a Leica L1 Choke ring and 2 more bullets when it stops raining a bit. I think I'll clear the leaves out of the gutter's while I am about it ;) --marki -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Graham Sent: Sunday, 30 June 2013 4:36 AM To: time-nuts@febo.com Subject: [time-nuts] GPS antenna splitter I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Both 'GPS Networking' and 'GPS Source' do good GPS splitters. Compared to Mini circuits type of splitters you will get the necessary dc-blocks and biasTs built in. Compared to HP/Agilent/Symmetricom splitters you will often get both L1L2 through. On Epay they often cost less. Some example id's... 231007617041, 200937306966,300919014379 Good luck in finding something that suits your needs. -- Björn Skickat från min Mobil Originalmeddelande Från: Graham planoph...@aei.ca Datum: 2013-06-29 20:35 (GMT+01:00) Till: time-nuts@febo.com Rubrik: [time-nuts] GPS antenna splitter I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi From what I've seen, a 50 ohm load on the 8th port of an 8 port splitter does a pretty god job of doing the DC correction. No need for an inductor, everything matches up just fine. Since you have an amp in the antenna, you don't *always* need an amp in front of the splitter. A lot depends on how much cable loss you happen to have (and the gain of the amp in the antenna). With a modest amount of cable ( 50') eight port splitters seem to work pretty well. Bob On Jun 29, 2013, at 4:34 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi Bob, On 06/29/2013 08:43 PM, Bob Camp wrote: Hi The auction sites are great sources of GPS splitters. I've gotten Mini Circuits splitters for much less than what they go for new. All of the ones I've seen do indeed pass DC. One thing to consider - you may want one with an extra port on it. Some GPS cards are a bit sensitive to antenna current. If you gang up seven receivers, one may not see enough drain to turn off the antenna alarm. The simple answer is to terminate one port with a resistor to ground. If you do need to inject DC, they make purpose built gizmos. You can also run one of the Symmetricom splitters that has DC blocking on all but one port. They tend to be expensive. For GPS receivers needing more DC load, I've found that hooking up a DC load through a SMD inductor in series with a SMD resistor (150 Ohm is what I've used). I hacked that onto a BNC-T and it got a GPS receiver to work. Strange that my hobby-hack is drive-by delivered to one of the major telecom operators, but it solved their problems. :) A splitter should have a pre-amplifier. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi Bob, On 06/30/2013 01:50 AM, Bob Camp wrote: Hi From what I've seen, a 50 ohm load on the 8th port of an 8 port splitter does a pretty god job of doing the DC correction. No need for an inductor, everything matches up just fine. Since you have an amp in the antenna, you don't *always* need an amp in front of the splitter. A lot depends on how much cable loss you happen to have (and the gain of the amp in the antenna). With a modest amount of cable ( 50') eight port splitters seem to work pretty well. From my experience, what is needed depends on the GPS receiver and it expectance of the antenna current. Some may need that extra load. The DC load may not match 50 Ohm. For an antenna-splitter to be gain-neutral it needs an amplifier. If you have good conditions, you do not need it. But I have been fighting gain problems and seen how it limits my ability to lock-up. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Hi With an 8 port splitter, each of the 7 GPS's sees 50 x 7 = 350 ohms. That's pretty close to the typical 330 ohm load that gives you around 15 ma of sense current. The antennas pull a wide range of currents, so there is not a one size fits all sort of load. If your antenna has 36 db of gain, an 8 port should use up about 9 db of that. There's still a lot of gain left to have =10 db past the loss. If your receiver is a modern one it should have a 1 to 2 db noise figure. If the antenna is at 0.3 db (pretty good antenna) then 10 db is plenty. Bob On Jun 29, 2013, at 8:14 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi Bob, On 06/30/2013 01:50 AM, Bob Camp wrote: Hi From what I've seen, a 50 ohm load on the 8th port of an 8 port splitter does a pretty god job of doing the DC correction. No need for an inductor, everything matches up just fine. Since you have an amp in the antenna, you don't *always* need an amp in front of the splitter. A lot depends on how much cable loss you happen to have (and the gain of the amp in the antenna). With a modest amount of cable ( 50') eight port splitters seem to work pretty well. From my experience, what is needed depends on the GPS receiver and it expectance of the antenna current. Some may need that extra load. The DC load may not match 50 Ohm. For an antenna-splitter to be gain-neutral it needs an amplifier. If you have good conditions, you do not need it. But I have been fighting gain problems and seen how it limits my ability to lock-up. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPS antenna splitter buyers' guide
(If this shows up twice, I apologize. Gmail seems to have switched me to sending HTML-formatted mail by default, and the time-nuts server doesn't like that. Anyone know how to switch back permanently?) It's possible to use standard microwave power dividers as GPS antenna splitters, but they have several drawbacks. Management of DC to the antenna LNA creates one set of problems. Insertion loss and lack of RF isolation between outputs can present additional problems. In professional settings, it's common to use purpose-built GPS antenna splitters. HP/Agilent/Symmetricom GPS antenna splitters are fairly common on the auction site. Unfortunately, they were designed and specialized for all-Agilent systems and they don't necessarily play well with others. You can get GPS splitters that work better with a mix of GPSDOs, and generally pay less as well because you're not buying the Aglient name. The two most common (in the US) makers of purpose-built GPS antenna splitters are GPS Source and GPS Networking. Their devices are more or less interchangeable. One of these (the latter, I think) was formerly known as WR Incorporated. Googling WR no longer gets you any useful information, so stuff with that name tends to be cheaper at auction than the others. (Full disclosure: I know several of the principals in this business. But I'm sure they'd want me to tell you to buy their stuff new rather than used.) Purpose-built GPS splitters generally consist of an RF power divider and a method of managing the DC bias sources for the antenna LNA. They often contain an RF amplifier to make up the loss in the power divider itself (10 dB for an 8-way splitter) and the loss in a potentially long cable run from the antenna. Some models are built with high RF isolation between ports. This is done by adding (say) 20dB to the amplifier gain, and then inserting a 20dB attenuator between the power divider and each port. This adds 40 dB of isolation between ports, which keeps the various receivers from interfering with each other. (Some common receivers through the 1990's would leak high levels of local oscillator signals out their antenna ports, which would jam other receivers connected to the same antenna.) If the splitter says a receiver port is DC blocked, that port is generally connected to ground through an RF choke and a resistor of 200 to 500 ohms. This keeps the antenna fault detector on many receivers happy. If the port says DC thru, that port is DC-connected to the antenna port to power the antenna LNA. That port will generally also power the splitter's internal amplifier, if it has one. Sometimes the combined load can overload the receiver's DC output current limit. It's common for larger splitters to have a separate power source (wall-wart) to power the antenna and the internal amplifier. In this case, all the receiver ports will be DC blocked. This configuration is most convenient for a time-nut lab, so that you can swap out any receiver you want without interrupting the others. These devices are fairly simple internally, and the various ordering options (amplifiers, isolation, DC blocking, etc) were typically done by stuffing the correct set of parts onto a common PC board. The ones I've worked on all had a two-layer PCB, with parts and microstrip on one side and mostly ground-plane on the other side. If you find one for sale that's not quite configured the way you want, you can probably reconfigure it with a bit of thought and some surface-mount soldering. The cases come apart easily, with conventional screws along the sides, sometimes hidden under the labels. These splitters were available new with SMA, TNC, and N connectors, and sometimes BNC as well. BNC connectors can often be replaced with TNC connectors without too much trouble (and should be replaced; BNC connectors are not suitable for precision GPS installations). If possible, get a splitter with one or two more ports than you think you will need. There's always another GPSDO to test, and you may be able to borrow some professional survey equipment and connect it to your spare antenna feed to get an accurate antenna position. Hope this helps. PS: The irony of doing a post like this is that more people will bid on these things now that they know more about them, and prices will rise. But I already have all the splitters I need :) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] GPS antenna splitter
The amp/splitter I've bought from seller RDR-electronics on Ebay have been Minicircuits ZAPD-3DB-1575-3, 2-way GPS Antenna Splitter N-f. I didn't see any for sale right now but they show up from time to time. See item # 300915251060 to see what they look like. -Arthur ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Yet another hacked up TV splitter for GPS use: http://www.n4iqt.com/dtv4x8/ http://www.n4iqt.com/dtv4x8/dtv4x8-notes.txt http://www.n4iqt.com/dtv4x8/5vreg-mod.JPG (change 12 volt to 5 volt for antenna) - Original Message - From: Mark C. Stephens ma...@non-stop.com.au To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, June 29, 2013 3:51 PM Subject: Re: [time-nuts] GPS antenna splitter Hi Graham, Unfortunately, when you get the 'disease' 8 antenna probably will be the minimum, I think myself have 7 bullets, A symetricom 12V puckish thing (very good btw) 2 trimble pucks. a hp 58534 integrated RX antenna that weighs about a kilo but has super accurate PPS and a trimble acutime gold (which isn't very accurate at all..) However, I still am in need of more!!! So I found a good solution in a televee's satellite splitter I found in the junk box. Here is how I did it: http://www.vk2hmc.net/blog/?p=159 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS antenna splitter
Graham, I have a 2 symmetricom 58535a GPS splitters and 2 Huber + Suhner 3403.17.0003 GPS lightning arrestors that are surplus to my needs. One splitter and is out of the original pack but the other 3 are still sealed. If you or anyone else is interested contact me off list. Eric On Jun 29, 2013 11:36 AM, Graham planoph...@aei.ca wrote: I find my self in need of either splitting a current GPS antenna feed or putting up yet another antenna, I would prefer splitting the current feed. There are a few options one of which is a Mini Circuits ZAPD-2DC+ splitter/combiner whose data sheet specifically states DC pass through from one port to the combined port. Fair enough, this should work very well. However, there is another model, the ZAPD-2-N (having type N connectors) whose data sheet states neither DC feed through or not, in other words, it is does not say explicitly that it does or doesn't. I think the ZAPD-2-N splitter would work to split the antenna but I am sure about being able to feed the antenna through this splitter/combiner and was hoping someone could state yay or nay on that point. However, if it would not pass DC to the antenna I suppose I could add a power feed to the splitter to do so and some sort of a load on the GPS side to trick the receiver into thinking there was an antenna attached. I was about to order one of the ZAPD-2DC+ from the Mini Circuits web site but upon check out found they would only ship via UPS or some other courier rather than by USPS. This would double the price for this coming into Canada - I will only use UPS for domestic shipping if I have no choice but never for cross border purchases, their handling fees are just too much. So, I was just looking for alternatives or perhaps someone knows a source for the ZAPD-2DC+ that would be willing to use USPS for shipping. cheers, Graham ve3gtc __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
