| Author |
Message |
    
Mdiver
Advanced Member
Username: Mdiver
Post Number: 614
Registered: 11-2003
| | Posted on Monday, December 15, 2008 - 9:30 pm: | 
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Can it possible to make a 11 meter Repeater???--I no it can be made just my 2 cents.
CEF 252 |
Bruce
Senior Member
Username: Bruce
Post Number: 4898
Registered: 9-2003
| | Posted on Tuesday, December 16, 2008 - 6:36 am: |
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Yes it can be done .... but it's not legal.
Starting on 10 meters the inputs are on 29.520, 540, 560 and 580 the outputs are on 29.620, 640, 660 and 680 mhz. They can be found on all vhf/uhf bands.
SO it could be done on CB using say ch 1 in and ch 8 out ...........
You CAN use AM SSB DIGITAL or FM as long as you provide for each modes needs ..... AM repeaters were common in the 60's untill FM became cheap enough.... and with it's limiting just worked so much better ....
Repeaters are not that hard to make I ran WR4ANA here in the 70's on 52.55 input and 53.55 output built from a old motorola radio into 2 DI-6 groundplanes at 50 foot each and had a 4 cavity duplexer. It covered from Port Richie to Bradenton Fl and was on untill a lighting hit distroyed it in 1980.
Bruce
On 6 since 66
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N8fgb
Member
Username: N8fgb
Post Number: 57
Registered: 5-2002
| | Posted on Tuesday, December 16, 2008 - 8:49 am: |
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I don't know your regs down under. But if allowed could be possible. I beleive u have UHF cb, that might be better.
Rich |
Bruce
Senior Member
Username: Bruce
Post Number: 4899
Registered: 9-2003
| | Posted on Tuesday, December 16, 2008 - 9:53 am: |
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Australia has a 470 MHz CB band with repeaters but we don't here ....
We do have MURS CB VHF bur repeaters are not allowed on MURS.
On 6 since 66
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Hotwire
Senior Member
Username: Hotwire
Post Number: 2699
Registered: 1-2005
| | Posted on Friday, December 19, 2008 - 6:00 am: |
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Yeah Steve would'nt it be awesome? Just think of all the pileups to deal with. You know the the cb mentallity out there. Some guy with 20kw next door to the repeater would be ruining it for the rest of us.
Kenny
CEF491
Reading the mail around Indianapolis Indiana!
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Bruce
Senior Member
Username: Bruce
Post Number: 4906
Registered: 9-2003
| | Posted on Friday, December 19, 2008 - 7:00 am: |
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You could TONE the input but that would not stop someone from jamming it.
Repeaters are not that hard to build it's a matter of hooking a receiver to a transmitter and controlling it with some form of switch.
This would apply to any band even CB.
My 6 meter one was built from a 47 MHz radio built in 1953 .... yep a tube hunker.
The controller was a HAMTRONICS COR/TIMER board which you can still buy 30 years later .....
Mine on 52/53 Mhz with 2 cavies on each antenna one trapping out the transmit frequency and the other the receive frequency the ground planes only needed to be 30 foot apart for the -120DB isolation needed to hear a .5UV signal without the transmitter interfering with it.
The real problem is there is no band plan ....no standard to use for offset and no rules as to input or output frequencies ... other than illegal.
Too bad MURS does not allow them since MURS is also CB.
On 6 since 66
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Caledonia
Member
Username: Caledonia
Post Number: 77
Registered: 8-2005
| | Posted on Friday, December 19, 2008 - 1:42 pm: |
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You can do it on GMRS, which is also part 95. |
Bruce
Senior Member
Username: Bruce
Post Number: 4907
Registered: 9-2003
| | Posted on Friday, December 19, 2008 - 3:00 pm: |
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YES but here in tampa you will not find a open pair.
On 6 since 66
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Mdiver
Advanced Member
Username: Mdiver
Post Number: 615
Registered: 11-2003
| | Posted on Friday, December 19, 2008 - 10:28 pm: |
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Thanks Bruce I will get back to you on this yea.. it can be done -gee 2 meter with a dummy load and wires out of a radio.. darn impressed me --I will email on this soon when I find for info -Thanks Again
Steve
CEF-252
Northern California |
Kc8gpd
Junior Member
Username: Kc8gpd
Post Number: 17
Registered: 2-2004
| | Posted on Thursday, December 25, 2008 - 8:11 am: |
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First of all at 27MHz you would need one heck of a duplexer for 100khz spacing. and using AM @ 600khz is hard enough let alone 100khz. can you say splatter? you would need to pump some power into the duplexer to get 4 watts out of the duplexer (can you say even more splatter?). at 27mhz and 100khz spacing the insertion loss would be tremendous. and of course finding a duplexer for 27mhz would be a job in it's self. you would want a BP-BR duplexer. |
Tech237
Moderator
Username: Tech237
Post Number: 1102
Registered: 4-2004
| | Posted on Thursday, December 25, 2008 - 1:06 pm: |
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KC8qpd is right. I am having fun working on a duplexer for a 10m repeater and it is not easy..
Simon
Tech237
N7AUS
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Bruce
Senior Member
Username: Bruce
Post Number: 4917
Registered: 9-2003
| | Posted on Thursday, December 25, 2008 - 4:22 pm: |
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most 10 meter sites are split my cavities on 6 meters were over 3 foot tall 2/3 a 1/4 wave I have a smaller cavity about 18 inches each great for killing intermod but are no good for repeater use..... too low a Q.
On 6 since 66
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