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Author Topic: Solar-powered, Portable 2 Meter Repeater Inquiry  (Read 27384 times)
N4CR
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Posts: 1672




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« Reply #15 on: October 22, 2012, 09:00:14 AM »

Glad the storm didn't get out of control for you.

May I suggest you take the time to find a 'mobile' duplexer. Undoubtedly it will make the entire project far more feasible and they are really quite inexpensive.

Something like:

http://www.ebay.com/itm/VHF-4-Cavity-Mobile-Duplexer-/230528463208?pt=US_Ham_Radio_Transceivers&hash=item35ac913168

Says he ships world wide and for $20 will tune it to your specifications. I'd tune it for free for you if you want. I could probably even come up with the cables for you at no charge.

These things are comparatively tiny. That unit has BNC connectors so it looks like it's probably 5" by 7" and about 1" thick.

I know you didn't want to get spendy on this, but that would be just the ticket to make it work and be extremely portable.

If you're into building, I have found some information on how bandpass and notch cavities are built and tuned. Here's a bunch of appropriate links that will raise your knowledge of what you need to acheive. http://www.repeater-builder.com is a treasure trove of information.

http://www.repeater-builder.com/antenna/pdf/beer-barel-cavity.pdf

http://www.repeater-builder.com/antenna/pdf/ve2azx-duplexerinfo.pdf

http://www.repeater-builder.com/antenna/pdf/w1gan-duplexer.pdf

http://www.repeater-builder.com/antenna/pdf/portune-trash-can-cavity-73-july-1996.pdf

http://www.repeater-builder.com/antenna/pdf/ground-plane-antennas-for-146-220-440-mhz.pdf

http://www.repeater-builder.com/antenna/pdf/qst-2009-07-coaxial-dipole.pdf

And assuming you have some reading time, here's a great read on many of the topics involved in getting a repeater (or any radio) to work well. Great stuff.

http://www.repeater-builder.com/antenna/pdf/andrew-about-rf-communications-a-non-technical-approach.pdf
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
5R8Z
Member

Posts: 11




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« Reply #16 on: October 22, 2012, 12:30:00 PM »

Phil, the VHF Mobile Duplexer on Ebay is exactly what I have been looking for. Electronics go missing in the postal system here so I will consider shipping to the US and have someone bring it over. Let me read through some of the suggested articles first before I commit.

tim, 5R8Z
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5R8Z
Member

Posts: 11




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« Reply #17 on: December 14, 2012, 09:33:07 AM »

Thanks to everyone who answered my question. I have not moved forward with this project because we may be moving early next year. If I pick up this project again I will report back here.
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