wcpotter Posted September 22, 2016 Report Share Posted September 22, 2016 I have a portable repeater all racked up & ready to go. Any suggestions for the antenna? Chris Quote Link to comment Share on other sites More sharing options...
0 res510cue Posted September 22, 2016 Report Share Posted September 22, 2016 What's the intended purpose of the portable repeater? Could use a 5/8 wave gain UHF antenna with a base radial kit. Quote Link to comment Share on other sites More sharing options...
0 SteveC7010 Posted September 22, 2016 Report Share Posted September 22, 2016 I have a portable repeater all racked up & ready to go. Any suggestions for the antenna? Chris You really need to give us a better idea of what you have and how you intend to use it. The antenna itself may not be as critical as how you plan to erect it when you set up. My radio club has a rollup J-pole that they fasten to a 15' extendable post and bungee to one leg of their shelter. It works great, but may not be so useful to others. More info from you means better suggestions from us. And what's your budget? Logan5 1 Quote Link to comment Share on other sites More sharing options...
0 wcpotter Posted September 23, 2016 Author Report Share Posted September 23, 2016 I have a Icom 45w repeater. Occasionally I will use it for various public events coordination. There will be a few handheld radios out in the field all within 1 mile or less of the repeater. In terms of the antenna...........budget isn't so much of an issue. Something simple to deploy that isn't massive would be ideal. Something that would mount to a tripod & mast would be great. Chris Quote Link to comment Share on other sites More sharing options...
0 PastorGary Posted September 23, 2016 Report Share Posted September 23, 2016 This one has worked well for our Chaplain Responder Teams in simplex mode... so, it should work fine for a 'suitcase repeater'... http://www.theantennafarm.com/catalog/tram-browning-br-6155-3574.html Quote Link to comment Share on other sites More sharing options...
0 SteveC7010 Posted September 24, 2016 Report Share Posted September 24, 2016 I have a Icom 45w repeater. Occasionally I will use it for various public events coordination. There will be a few handheld radios out in the field all within 1 mile or less of the repeater. In terms of the antenna...........budget isn't so much of an issue. Something simple to deploy that isn't massive would be ideal. Something that would mount to a tripod & mast would be great. Chris You can pick up an Ed Fong J-Pole kit off Ebay for around $25. You'll need to purchase a piece of pvc pipe locally. Instructions come with the antenna. As for a mast, something like this might be good for you: http://www.ebay.com/itm/13-Foot-Telescoping-Mast-Tripod-For-Portable-Antennas-Elevated-Cameras-WiFi-/191937470658 I did a search on ebay using mast tripod as key words. There were several other good possibilities in the search results. The antenna that Pastor Gary mentioned would work just as well. Really, most any small base station antenna for your frequency range will work fine. The heavier ones will need a sturdier mast and tripod. For your purposes, you're only limited by your ingenuity and imagination. There are lots of good solutions. I suggest you look at some of the setups that hams use for go kits. They're easily found on the web at various amateur radio websites. Quote Link to comment Share on other sites More sharing options...
0 zap Posted September 24, 2016 Report Share Posted September 24, 2016 DB404 is my goodie. A Laird FG450-6 works too. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
0 jvfreetage Posted September 29, 2016 Report Share Posted September 29, 2016 I have to second the Ed Fong j-pole. The thing is, if you buy it off e-bay from Ed, give him your transmit frequency, he will tune the thing for that frequency! Or you can try and build it yourself. Either way, I use the Ed Fong with a portable GMRS repeater as well as on a semi permanent basis (Military move every three years). When I use it with the portable repeater (about 15' of pole with the antenna on top) I get a good 2 mile range out of it with mobiles, and a solid mile + on HT's. The atenna is light enough that I literally strap my 15' of shelter poles to a corner of my 10'x10' straight leg pop up. It's a little tricky to get the antenna mounted to an upright pole, but with a little fiddling it's not so bad. I use a PVC "T" cut in half, four hose clamps, and about 3" of the left over PVC pipe from the antenna build. You make something that looks like an "H" clamping one side to the poles, and the other to the antenna. Works like a charm. Hope this helps! JamesWQUL457W8JVF Quote Link to comment Share on other sites More sharing options...
0 wcpotter Posted October 3, 2016 Author Report Share Posted October 3, 2016 Thanks for all the info. What are you all using for coax from the antenna to repeater in these portable/temporary situations? I'm using 1/2" superflex heliax @ home, but would prefer something more flexible for use in the field. Quote Link to comment Share on other sites More sharing options...
0 SteveC7010 Posted October 3, 2016 Report Share Posted October 3, 2016 Thanks for all the info. What are you all using for coax from the antenna to repeater in these portable/temporary situations? I'm using 1/2" superflex heliax @ home, but would prefer something more flexible for use in the field. My ham club uses about 15' of RG-58 for their field setup on 2M and 70CM. Works fine. Just for comparison's sake, typical mobile radio installs use RG-58 and the usual length supplied with the mount is about 17'. If your total coax run is about 30', you would do fine with RG-8. In all cases, the less adapters in the line, the better. Quote Link to comment Share on other sites More sharing options...
0 Logan5 Posted October 3, 2016 Report Share Posted October 3, 2016 I have some items useful for portable deployment, My favorite is the park on monopole base. small and simple to use with a short section of mast. secured with the weight of your car or truck. can accommodate telescoping mast and keep your cable run short so you could use smaller cable like 195 or 240. Quote Link to comment Share on other sites More sharing options...
0 wcpotter Posted October 3, 2016 Author Report Share Posted October 3, 2016 I have always understood that LMR type coax is not appropriate for use from the duplexer to the antenna. Quote Link to comment Share on other sites More sharing options...
0 Logan5 Posted October 3, 2016 Report Share Posted October 3, 2016 I used to have LMR400 from duplexer to the antenna. Now I have LMR600, however for a portable you do not want to have to deal with it's limited radius. Quote Link to comment Share on other sites More sharing options...
0 wcpotter Posted October 4, 2016 Author Report Share Posted October 4, 2016 Still not sure what to do, lol. Using LMR type cable for duplexer to antenna goes against everything I have been taught. Sounds like the people who are using rg-58 & rg-8 in the field aren't using it with a single radio & not a repeater setup. help! thanks Quote Link to comment Share on other sites More sharing options...
0 n4gix Posted October 4, 2016 Report Share Posted October 4, 2016 For more flexible coax for repeater use, I'd choose RG-214. It's true double-shielded cable with very low loss. Quote Link to comment Share on other sites More sharing options...
0 Durake Posted October 4, 2016 Report Share Posted October 4, 2016 I've always been recommended LMR, I suppose depending on what type it could be "bad" for portable repeaters, I've only ever had one person tell me to use RG. I'll have to try it sometime. Quote Link to comment Share on other sites More sharing options...
0 n4gix Posted October 4, 2016 Report Share Posted October 4, 2016 The problem with any cable that uses 'foil' as the inner shield is that over time it will begin interacting with the braided wire shield and become 'noisy'. This doesn't happen immediately and may take many months to develop, but it isn't a question of "if" as much as a question of "when..." : For detailed information, see here: http://www.repeater-builder.com/antenna/double-shielded-coax.html Logan5, zap and Durake 3 Quote Link to comment Share on other sites More sharing options...
0 gortex2 Posted October 5, 2016 Report Share Posted October 5, 2016 How big of a mast are you looking to use ? Our SAR team purchased the mast here on ebay - http://www.ebay.com/itm/ANTENNA-TRIPOD-29FT-ALUMINUM-PORTABLE-TOWER-MAST-KIT-NEW/361384099911?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D20131227121020%26meid%3Dc8638571b9a64db4b78809ad1b1b3bc3%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D360908000786 It works awesome and is light enough to carry up a trail. As for cable I tried various options from RG213 to 1/2" superflex. When all said and done we had the best luck with RG142. The loss for 30' is not enough difference than the 1/4" superflex hard line and holds up much better. I liked the 1/2" and 1/4" hard line but after both were kinked in half on the first deployment i knew they wouldn't work. Durake 1 Quote Link to comment Share on other sites More sharing options...
0 Durake Posted October 5, 2016 Report Share Posted October 5, 2016 How big of a mast are you looking to use ? Our SAR team purchased the mast here on ebay - http://www.ebay.com/itm/ANTENNA-TRIPOD-29FT-ALUMINUM-PORTABLE-TOWER-MAST-KIT-NEW/361384099911?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D20131227121020%26meid%3Dc8638571b9a64db4b78809ad1b1b3bc3%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D360908000786 It works awesome and is light enough to carry up a trail. As for cable I tried various options from RG213 to 1/2" superflex. When all said and done we had the best luck with RG142. The loss for 30' is not enough difference than the 1/4" superflex hard line and holds up much better. I liked the 1/2" and 1/4" hard line but after both were kinked in half on the first deployment i knew they wouldn't work. Dang.. I'll have to take a look into that.. Quote Link to comment Share on other sites More sharing options...
0 gortex2 Posted October 20, 2016 Report Share Posted October 20, 2016 Its a really slick mast kit. Sometime we only use a few poles and other times use all of them. For a fast deployment with not all the poles we don't even run guy ropes out and it works fine. We have a small VHF dipole antenna that is pretty light so it rarely moves the mast. Quote Link to comment Share on other sites More sharing options...
0 ihcollector Posted November 20, 2016 Report Share Posted November 20, 2016 I have found that a No-Ground plane mobile antenna on a good magnet mount works great for a portable repeater. I have also used the No-Ground plane mobile antenna on a base antenna kit with radials and used it on antenna mast. The important thing to watch out for is to make sure that your antenna cable center conductor and shield are made of the same materials. jwilkers 1 Quote Link to comment Share on other sites More sharing options...
0 zap Posted November 28, 2016 Report Share Posted November 28, 2016 The problem with any cable that uses 'foil' as the inner shield is that over time it will begin interacting with the braided wire shield and become 'noisy'. This doesn't happen immediately and may take many months to develop, but it isn't a question of "if" as much as a question of "when..." : For detailed information, see here: http://www.repeater-builder.com/antenna/double-shielded-coax.htmlThis. I've been forced to install some low tier repeater setups using LMR400. I've always noted that it should've been a different type of coax so when it does have to be replaced in a few years it'll be documented that a senior systems tech stated that. Part of sales persons selling an not consulting the guys who actually have technical knowledge. Sent from my SM-T350 using Tapatalk Quote Link to comment Share on other sites More sharing options...
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wcpotter
I have a portable repeater all racked up & ready to go.
Any suggestions for the antenna?
Chris
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