11-Meter AM-19 Repeater in Colorado

[slowmover]

Southbound thru Colorado Springs tonight and asked some base station locals if they could hear me across the sorry antenna built-in to this Freightliner.

The louder one replied he was hearing me from an antenna to the north of town, but I was hearing him via repeater 1,000-ft above valley floor from farther south.

I’d heard this idea bandied about for Cb, but didn’t expect to run across it.

They quickly lost me, to no surprise. I heard them all the way to the sketchy Loves at the Pueblo West exit.

Roger Beep Boy.

Must’ve had a half-dozen tones/sounds.

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[RFI-EMI-GUY]

Is it a simplex repeater?

 

[slowmover]

I don’t know the first thing about repeaters.
I can only say that the TX was crisp & clear.

The other man was faint.

 

[prcguy]

Was it an actual full duplex repeater or just a remote base at a high sight? A CB repeater is entirely possible, especially with a split site and internet connections so the receiver and transmitter can be far apart to avoid the need for a duplexer. I have a little experience with a CB repeater in the 1980s and it was very difficult and expensive to run full duplex at the same site but with todays technology and the Internet its much easier.

 

[RFI-EMI-GUY]

Certainly possible to cobble up a remote base, and even satellite voting on CB.

 

[prcguy]

I have a system here that can become a CB repeater within seconds. I have three Icom 7100 radios with remote rig boxes spread around at different locations and all the control heads in front of me. I can program a pair of these radios on the same frequency and connect the control heads together and its an instant repeater. Any frequency, any mode, any time.

 

[RFI-EMI-GUY]

I have a system here that can become a CB repeater within seconds. I have three Icom 7100 radios with remote rig boxes spread around at different locations and all the control heads in front of me. I can program a pair of these radios on the same frequency and connect the control heads together and its an instant repeater. Any frequency, any mode, any time.

The trick is for mobiles, you need a modified CB radio to do half duplex. I suppose you could hack up some old radio with BCD channel selector to change the TX channel on the fly.

 

[prcguy]

With my split site repeater you can run a regular CB over most of the area, up to the point the transmitter side is stronger than the mobile. However the few times I enabled my system, and I won't mention what band it was on, it was repeating between different states. So a mobile in So Cal could talk to another mobile in Dallas and it repeated everything on that frequency between the two towns.

QUOTE="RFI-EMI-GUY, post: 3784998, member: 774481"]
The trick is for mobiles, you need a modified CB radio to do half duplex. I suppose you could hack up some old radio with BCD channel selector to change the TX channel on the fly.
[/QUOTE]

 

[slowmover]

Went back thru a recent evening, but didn’t hear this guy.

Will try again I get thru that way.

 

[slowmover]

I’ll be leaving the house in a few days with a proper antenna installed. This route is one I’ll be running, maybe again at night as with originating post.

I’ll ask questions if I catch him. Suggestions for which I’d appreciate (as I don’t know what the hell I’m talking about).

.

 

[slowmover]

Came across this again southbound thru Colorado Springs a few nights ago.

I’d gotten into the rural area between the cities after leaving Denver and — with every filter off or backed down — was listening for truck-related noises with volume up high as silence on-air was complete more than an hour past sundown.

Then was blasted out of my seat with one participant saying he was aiming a beam at the repeater from 40-miles. The other guy reported being 15-miles further south and was not nearly so loud. Use was one at a time.

TX from one radio and listen from another at each station.

Even with my radio changed back to a normal volume setting, that one yahoo was incredibly loud over the ten miles I traveled during their conversation.

One goes past the Air Force Academy past Pikes Peak and then past Cheyenne Mountain in that stretch of the Front Range.

Elevation on that repeater is significant.

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[prcguy]

Came across this again southbound thru Colorado Springs a few nights ago.

I’d gotten into the rural area between the cities after leaving Denver and — with every filter off or backed down — was listening for truck-related noises with volume up high as silence on-air was complete more than an hour past sundown.

Then was blasted out of my seat with one participant saying he was aiming a beam at the repeater from 40-miles. The other guy reported being 15-miles further south and was not nearly so loud. Use was one at a time.

TX from one radio and listen from another at each station.

Even with my radio changed back to a normal volume setting, that one yahoo was incredibly loud over the ten miles I traveled during their conversation.

One goes past the Air Force Academy past Pikes Peak and then past Cheyenne Mountain in that stretch of the Front Range.

Elevation on that repeater is significant.

.

This brings up a technical question of how they are keeping the transmit side of the repeater from getting into the receive side and locking it up. The CB repeater I'm familiar with from the 80s used a different input frequency than the output with several input frequencies in the 49MHz and 467MHz range.

 

[slowmover]

That’s my understanding, which I didn’t make clear. The other radio isn’t a CB.

TX on (something), and listen on CB.

 

[rescuecomm]

Maybe a retuned 10 meter radio that can do offsets? Okay, setup as a remote base. Got it.

 

[prcguy]

Maybe a retuned 10 meter radio that can do offsets? Okay, setup as a remote base. Got it.

Probably something like MURS or FRS or similar as the input. A duplexer for 11m is a huge problem and going split band fixes it.

 

[slowmover]

11 Meter Repeater

I got bored and starting thinking about how to implement a CB repeater... here is my thought on how to implement this... TX site: Feq: 27.315 TPO: 4 Watts Mode: AM Antenna: Custom Dual 4 Bay Folded Dipole Filter: Bp: 27.315 Br: 27.965 Coax: Andrew 1 Inch Hardline Controller: Rack Mount Custom...

forums.radioreference.com

 

[slowmover]

With my split site repeater you can run a regular CB over most of the area, up to the point the transmitter side is stronger than the mobile. However the few times I enabled my system, and I won't mention what band it was on, it was repeating between different states. So a mobile in So Cal could talk to another mobile in Dallas and it repeated everything on that frequency between the two towns.

QUOTE="RFI-EMI-GUY, post: 3784998, member: 774481"]
The trick is for mobiles, you need a modified CB radio to do half duplex. I suppose you could hack up some old radio with BCD channel selector to change the TX channel on the fly.

[/QUOTE]

I’m getting the feeling this approach or similar is being used with DuckDik in the Desert, CB Radio God, Mark Sherman.

As well, the welfare windups in FL who all come in at the same strength despite some being quite far apart. MN to TX I’m hearing them almost 12 hrs all seven days. Sunup to sundown.

Both really screw up AM-19 which I believe to be the point. The former I don’t hear west of IH-35. He yammers, and then they (and others who come & go) howl about him for hours.

I don’t believe any of these are the boss.

There’s a few in SoCal (San Bern and Chula Vista) I can usually hear concurrent with the litterbox much of the day.

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[merlin]

I only know of 2 options that would work.
A split site repeater, or a remote via another band, Stuck with half duplex with the remote.
I just can't fathom a duplexer on 11 meters and single frequency. technically impossible.

 

[K5MPH]

Can you tell us what radio you are using .......

 

[slowmover]

I was going south on IH25 likely using a Galaxy 959b (into a West Mountain ClearSpeech). Though may have been the fly n’drive Galaxy 86v backup radio still in use.

After dark, not much road traffic. Nothing else on AM-19 at that point.

Still stands out in memory for clarity & sheer volume.


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