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CB Radio Forum - Discussions regarding Citizens Band Radio (CB)

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Old 06-08-2018, 9:36 PM
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Default Galaxy user's question on ssb and a slight deviation on frequency

Got a brand new peaked and tuned from a shop ( will not name cause I don't believe this is on them) it's a DX959B. Everything is good for what I truly need it for. Was playing around on it the other night and noticed when I switched to either the USB or LSB that the frequency display doesn't move. For the life of me I can not find anything in the users manual to indicate that it doesn't or does. Is this normal? Also one thing I have noticed but doesn't seem to affect tx is occasionally upon keying the Mic up the frequency goes up ( ie channel 19, 27.185 normally but upon keying it goes to 27.186) doesn't seem to affect anyone hearing me loud and clear. Just for reference the meter on the unit doesn't go past approx 5 watts of power on cb bands and about 1 watt on ssb when the switch is in either direction. SWR is no more than 2 on any channel. Plugged directly into CB power hook up in the upper partition of the frieghtliner cascades.
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Old 06-09-2018, 11:12 AM
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Moderators delete if you want questions on it were answered outside of forums.

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Old 06-10-2018, 8:36 AM
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How about sharing those answers from elsewhere. Thanks.
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Old 06-10-2018, 10:17 AM
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Quote:
Originally Posted by firefighter_21701 View Post
....Was playing around on it the other night and noticed when I switched to either the USB or LSB that the frequency display doesn't move. For the life of me I can not find anything in the users manual to indicate that it doesn't or does. Is this normal? Also one thing I have noticed but doesn't seem to affect tx is occasionally upon keying the Mic up the frequency goes up ( ie channel 19, 27.185 normally but upon keying it goes to 27.186) doesn't seem to affect anyone hearing me loud and clear. Just for reference the meter on the unit doesn't go past approx 5 watts of power on cb bands and about 1 watt on ssb when the switch is in either direction. ....
I'm guessing you're not aware of what single sideband (SSB) is. An AM signal has 3 parts: a carrier (half the power output, which has no audio at all) and two sidebands, one on each side of the carrier that carries the audio. Since the sidebands duplicate each other, comms can be established by eliminating the carrier and one of the sidebands in the transmitter circuitry. This is what SSB accomplishes. In effect, SSB occupies only half the bandwidth and is more efficient than an AM signal. That "bleedover" you may have heard on AM that you couldn't tune in is in fact a SSB signal. In your frequency readout example above, the carrier of channel 19 is 27.185; the audio, which duplicate each other, is 27.184 (LSB) and 27.186 (USB).

With that said, a CB with sideband capability is still using the same 40 channels on either AM, LSB or USB. This is why a sideband QSO cannot be on the same channel as an AM QSO at the same time. Also, there is (or was) a "gentleman's agreement" that designated channels 16-18 (some areas ch 15 as well) and channels 36-40 as sideband channels only.

Other than the SSB power output, what you've described tells me that the radio is behaving exactly as it should. SSB power output should max out at 12 watts peak envelope power (PEP).

HTH,
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Last edited by kc4jgc; 06-10-2018 at 10:37 AM..
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Old 06-10-2018, 7:51 PM
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Originally Posted by FiveFilter View Post
How about sharing those answers from elsewhere. Thanks.
Went to a cb shop in Knoxville tn at the petro. He said I have to use the modulation knob to tune it in. Which makes sense. Also the slight deviation on the am side of things is nothing to really worry about as everyone can hear me just fine.

Edited because my spell check is more of an idiot than I am. For example I dont talk about ducks

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Last edited by firefighter_21701; 06-10-2018 at 8:12 PM..
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Old 06-10-2018, 8:09 PM
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Originally Posted by kc4jgc View Post
I'm guessing you're not aware of what single sideband (SSB) is. An AM signal has 3 parts: a carrier (half the power output, which has no audio at all) and two sidebands, one on each side of the carrier that carries the audio. Since the sidebands duplicate each other, comms can be established by eliminating the carrier and one of the sidebands in the transmitter circuitry. This is what SSB accomplishes. In effect, SSB occupies only half the bandwidth and is more efficient than an AM signal. That "bleedover" you may have heard on AM that you couldn't tune in is in fact a SSB signal. In your frequency readout example above, the carrier of channel 19 is 27.185; the audio, which duplicate each other, is 27.184 (LSB) and 27.186 (USB).

With that said, a CB with sideband capability is still using the same 40 channels on either AM, LSB or USB. This is why a sideband QSO cannot be on the same channel as an AM QSO at the same time. Also, there is (or was) a "gentleman's agreement" that designated channels 16-18 (some areas ch 15 as well) and channels 36-40 as sideband channels only.

Other than the SSB power output, what you've described tells me that the radio is behaving exactly as it should. SSB power output should max out at 12 watts peak envelope power (PEP).

HTH,
You're guess would be correct. I have never operated a cb with SSB. Heard about it but have never before had the opportunity to be able to operate SSB. I'm still learning and the membership to this forum is worth its weight in gold so to speak. I have more luck on the chicken band talking to other drivers on 19 than I do on 146.520 simplex. Mostly because I'm never near enough to a repeater for my hts, and my mobile unit is waiting on the antenna and wire right now. Thank you very much. I would have never know about the channel usage if you hadn't replied.

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Last edited by firefighter_21701; 06-10-2018 at 8:15 PM..
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Old 06-11-2018, 12:26 PM
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Smile Not a problem!

Glad I was able to clear things up with you.

One other thing the CB sideband ops who are the old farts (like me if I still had a CB), NEVER use "handles" (first names only) and NEVER use the 10-codes, preferring the "Q" signals. In my day, before attempting to make a contact we always asked "QSK?" (Is the frequency clear?) before making the call. Other "Q" signals that were used were QSL (confirm) (never over use), QTH (location), QSY (change frequency). I remember one blind operator would occasionally ask for the QTR as he couldn't see a clock.
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