Grundig G3 Globe Traveler Question

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MarcusDude

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I have a Grundig G3 Globe Traveler radio. When I listen to HF utility users in USB mode, I have to tune the frequency down 3 kHz from the listed frequency. Is this normal? Is there something I wasn't told about shortwave? Is there something wrong with my reciever, or is it just some kind of quirk?

Examples:

If I want to listen to the USAF GHFS on 11175, I have to tune to 11172.
If I want to listen to NY VOLMET on 10051, I have to tune to 10048.
If I want to listen to USCG SCN channel 424 on 4426, I have to tune to 4423.
 

WayneH

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Hello MarcusDude, we have a category of forums for shortwave. I have moved your post there. Please use them for all HF, SW, etc in the future. Thanks.
 

gpsblake

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A quirk and not normal. I think you got a defective radio if this is the case. Here's a youtube video of VOLMET on usb on the correct frequency on a G3

8957 KHz Shannon Volmet - YouTube

Have you tried this on a AM transmission? Let's say 6090 at night, do you have to tune to 6087 to understand the voice on USB? Also curious about LSB, do you have to off-tune to hear LSB correctly?

I would also seem to logic that if your USB if off by 3khz, it would render the auto-sync function useless on that radio.
 

MarcusDude

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Yes, LSB is the same. I also have to tune down 3 kHz. I just figured that out today by monitoring some 80M Ham nets in my state (Wisconsin). There was one listed on 3967 LSB this morning, but I heard them on 3964. Oh well, it's not a big deal, I'll just make the necessary adjustments.
 

ab3a

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In the following discussion, we assume a voice frequency bandwidth of 300 to 3000 Hz.

In ham radio communities, they document the frequency of the suppressed carrier for single sideband transmissions. So for example, I can transmit on 7.200 MHz, and my signal will occupy 7.1970 MHz to 7.1997 MHz. if I transmit lower sideband and 7.2003 to 7.2030 MHz were I to use upper sideband. Note: by convention, hams use lower sideband on the 7.0 -7.3 MHz band and below; and upper sideband, from 10 MHz and up. This standard came about because of the 9 MHz crystal filters that used to be commonplace in older radio designs.

In military applications, they use upper sideband everywhere, and the frequency is the center of emission. So assuming a voice transmission from 300 to 3000 Hz, they would document their frequencies about 1.5 kHz higher than the suppressed carrier frequency.

What you're reading seems like a firmware problem. From the reviews on eham.net, I think it is likely these radios have a quality control problem. Check with the manufacturer.
 

majoco

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In military applications, they use upper sideband everywhere, and the frequency is the center of emission.

IMHO all the people on here who listen to 11175kHz would disagree with this statement. I have always dialled in the suppressed carrier frequency, military or otherwise, never the notional middle of the sideband.
 
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