Will Saber's do narrow band? Our PD uses all saber portables and we want to get our new UHF fire channels in them. All our new channels are narrow band though. I'm not overly worried about it, but I want to be ready for it.
They also have some syntor X9000 and spectra mobiles. I assume the X9000 is wideband only. The ones with spectras might?
Narrow band on sabers and spectras?
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Narrow band on sabers and spectras?
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ummm
no, no and no.
hence the reason that the market is becoming saturated with some very nice high end "wideband" equipment.
the spectras and sabers could probably be converted to narrowband... but the cost-per-unit is not going to make it economically feasible... in other words... putting $400 (parts/labor) into each radio just isn't worth it when the rest of the radios are nearing end of service life anyway (figure 10-12 years in the field)
doug
hence the reason that the market is becoming saturated with some very nice high end "wideband" equipment.
the spectras and sabers could probably be converted to narrowband... but the cost-per-unit is not going to make it economically feasible... in other words... putting $400 (parts/labor) into each radio just isn't worth it when the rest of the radios are nearing end of service life anyway (figure 10-12 years in the field)
doug
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I figured as much. I guess for the few times they will be using our frequency, life will go on with some audio distortion.
Will any of the radios at least accept a 4 digit decimal (aka- 460.5875) even if it still transmitting in wideband?
Will any of the radios at least accept a 4 digit decimal (aka- 460.5875) even if it still transmitting in wideband?
"I'll eat you like a plate of bacon and eggs in the morning. "
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
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Tom in D.C.
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WB vs. NB...
Matt:
My VHF Saber 3 accepts 12.5 kHz entries with no problem as, of course, does my UHF Saber 3.
For general information, the Vertex VX900 is programmable wide or narrow, transmit and receive, by individual channels. And so are my two Icom IC208s, believe it or not.
My VHF Saber 3 accepts 12.5 kHz entries with no problem as, of course, does my UHF Saber 3.
For general information, the Vertex VX900 is programmable wide or narrow, transmit and receive, by individual channels. And so are my two Icom IC208s, believe it or not.
Tom in D.C.
In 1920, the U.S. Post Office Department ruled
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FFParamedic571
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So they can take a narrow band frequeny but will still be modulatin on 5kHz of bandwidth basicly. Good. I don't recall which model saber they use but they must be pretty old.
"I'll eat you like a plate of bacon and eggs in the morning. "
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
-
Tom in D.C.
- Posts: 3859
- Joined: Tue Sep 04, 2001 4:00 pm
- What radios do you own?: Progreso soup can with CRT
More on WB vs. NB
The Sabers stay wideband TX and RX when you set them to 12.5 kHz channels, as you might expect them to. The VX900 actually changes the deviation on TX and the passband on RX.
Tom in D.C.
In 1920, the U.S. Post Office Department ruled
that children may not be sent by parcel post.
In 1920, the U.S. Post Office Department ruled
that children may not be sent by parcel post.
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natedog224
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The main channel these radios would be operating on is wideband. The narrow channels are only secondary. Not gonna retune the whole radio for that.
"I'll eat you like a plate of bacon and eggs in the morning. "
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
-
chipjumper
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The last HT1000 I programmed was narrow band capable. Just like the MTS2000, there is a sub-menu for each personality to set that (among other things). I don't know if there are older models incapable of it though.
"I'll eat you like a plate of bacon and eggs in the morning. "
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
- Some loser on rr.com
eBay at it's finest:
Me: "What exactly is a 900Mhz UHF CB?"
Them: "A very nice CB at 900Mhz speed!"
Wide/narrow radios
Hi Y'all,
AFAIK, all of the Jedi-series (HT1000, MT2000, MTS2000, etc.) are capable of being programmed for wide or narrowband operation on a channel-by-channel basis. Ditto the Visar, Waris and Astro Saber.
73 DE Hartley
AFAIK, all of the Jedi-series (HT1000, MT2000, MTS2000, etc.) are capable of being programmed for wide or narrowband operation on a channel-by-channel basis. Ditto the Visar, Waris and Astro Saber.
73 DE Hartley
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RADIOMAN2002
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High-tolerance crystal?
Hi,
To get better than about 10 ppm requires a TCXO as opposed to a simple crystal, and I believe all modern synthesized Motorola radios use these. Unfortunately, they are VERY expensive parts in the higher tolerances.. The only way around this would be to scrounge one out of a dead radio that has the high-tolerance part in it (such as a 900 mHz radio). I've done this on Spectras, but I haven't tried an HT (I'm not a surface-mount guru!)
But then you would still have the problem of a wideband receiver which is tougher to fix, particularly in portables. If you don't narrow up the IF, you are definitely going to get adjacent-channel interference!
73 DE Hartley
To get better than about 10 ppm requires a TCXO as opposed to a simple crystal, and I believe all modern synthesized Motorola radios use these. Unfortunately, they are VERY expensive parts in the higher tolerances.. The only way around this would be to scrounge one out of a dead radio that has the high-tolerance part in it (such as a 900 mHz radio). I've done this on Spectras, but I haven't tried an HT (I'm not a surface-mount guru!)
But then you would still have the problem of a wideband receiver which is tougher to fix, particularly in portables. If you don't narrow up the IF, you are definitely going to get adjacent-channel interference!
73 DE Hartley
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larryepage
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I wish you the best in converting the radios to the narrow channels, but would like to make one correction. As has been discussed in other threads several times, turning down the deviation will not make a narrow band radio. In addition to the reduced deviation and improved frequency stability, you will have to modify your modulation scheme. Bandwidth is not just deviation...it is deviation plus "important" sidebands. These come from the frequency of the modulating signal and are in addition to the swings from the deviation.
In addition, you are going to have to replace or retune your receive filters to provide the necessary selectivity and avoid interference from nearby channels. When you get into this area, you'll discover why the narrow band radios are generally rated about 10 dB worse than wide ones. Insertion loss goes up and recovered audo goes down. It's a rule of physics and there's really nothing to be done to fully offset it.
Regards,
In addition, you are going to have to replace or retune your receive filters to provide the necessary selectivity and avoid interference from nearby channels. When you get into this area, you'll discover why the narrow band radios are generally rated about 10 dB worse than wide ones. Insertion loss goes up and recovered audo goes down. It's a rule of physics and there's really nothing to be done to fully offset it.
Regards,
Larry Page
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RADIOMAN2002
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The area of my operation is not very likely to have much adjacent channel clutter so I am not really intersted in narrowing my receiver. Plus with the new power out limitations, I don't see it as a problem. If a $10.00 Walmart radio can operate narrow band I am sure a MX will sure blow it away. The way I remeber it from USAF tech school, as you turn down the deviation, the sidebands also go down.
There is no new modulation scheme from the FCC that I am aware of. The type numbers are different, which lists the modulation swing, for the required bandwidth.
This is all the same crap as 35 years ago when we had to go to 5KC from 15kC.
There is no new modulation scheme from the FCC that I am aware of. The type numbers are different, which lists the modulation swing, for the required bandwidth.
This is all the same crap as 35 years ago when we had to go to 5KC from 15kC.