Recently my M410V seems to have gotten confused. The AM band tuning is off by a few khz and I don't how to fix it.
Here's an example.
I'm using it to listen to AM 850, but it suddenly can only tune to AM 846 or AM 855. It had previously tuned to AM 850 directly. The channel is VERY strong so I'm not sure what's going on.
I've swapped batteries. Any thoughts? Any way to reset this or fine tune it?
Yes,removing the battery and going back to reset can help, also check for moisture, when the battery is removed try to apply some heat with a blower into the receiver housing to clear moisture, then try the set again.
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Your post/description "the frequency increases in steps of .2 Mhz or 200Khz" refers to the increment of frequency spacing between tuning steps and is largely dependent on the radio standards of the country/region the radio is intended to be used. Assuming no hardware fault to the radio, tuning steps may be adjusted by:
1. With the radio switched off, press the Step/Band button for about 2 seconds. This will display the current FM tuning step (200Khz as in your case);
2. With the radio switched off, press the Step/Band button for about 10 seconds. This will display FM and a blinking 50Khz with a single beep sound. By rotating the Tuning Control you can increase or decrease this value.
3. pressing the Step/Band button again will move you to the tuning increments of the AM band again adjustable via the Tuning Control.
4. pressing the Step/Band button again will save the setting and complete the process.
Hope this be of some help.
Good luck and kind regards.
Get you a metal box about 4 inches X 4 inches. Use 2 female Cb antenna inputs from old Cb radios or Radio Shack. Get a old Am radio tuner out of a AM radio(530-1700 khz.) Buy or scrap up some copper wire; big gauge I used. Wound 8-10 turns about " 1 inch round close tight wound. Solder to AM tuner- C1 it shall say on top of Am tuner. Solder Center of Am tuner to Ground(Metal box). For those who know electronics the Tuner is 0-365pf Am band 530-1700khz types. OK, back to assembly. drill a hole for the Two Female Cb Inputs on both sides of metal box. Attach copper wire inside to center taps of Inputs on both sides. Drill a hole for Am tuner and Screw on its lock nut and place a knob on it. Solder all grounds of Female Antenna inputs and Tuner Ground and all Grounds to metal box. Use a washer and Bolt to lock down Grounds to Box. This is how it operates after you use a Jumper to hook to TX of Cb radio. Antenna to other side. Its just a simple L/C network. The Tx travels through copper wire(coil) inside box and gets shunted to ground by the right level of PF Capacitance. The operator tunes it in to get a close to 1.1 to 1.5 SWR ratio. Its simple, but helps with bad Antennas.
You can change the AM tuning scale to 9 KHz or 10 KHz. After tuning in any AM station turn off the receiver. Hold down the Preset tuning + and - ve together.
All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
You have buttons to press to change the modulation.
FM covers regular FM band: 76 MHz (Japan) to 108 MHz and the higher frequency ones used for Air and Weather.
AM covers the Long waves (in Europe), the regular AM band (520 kHz-1700 kHz), and the Short wave bands 2MHz 30 MHz
It seems that you can tune the frequency in by direct entry with the number keys.
I do not see the image of the face of the radio but from my experience with many Grundig/Eton you should have two buttons with arrows (left A and Right Arrow) or two buttons with + and Minus (not the volume buttons). If you are in SW, pressing one of the buttons changes the tuning to the adjacent Meter band.
Read the manual. The radio may have been set to some defaults, although the time was not correct. When you started setting the time, it is possible that you should have run through the whole setup. For example some radios have different ranges for the FM bands: there is a Japanese band that starts at 76 MHZ, and ends at 108 MHz; there is the standard FM band from 88 MHz to 108 MHz; and a school band (I can't remember its range).
For AM the gap between neighboring positions may be set at 9 kHz or 10 kHz depending on the location (region or continent).
I suggest you get the manual and see if there is an initial setup procedure, then follow it.
The question is are they tunable to 12.5 kHz from their current state of 25kHz and the answer is yes. The FCC wants to be able to squeeze more out of the band. Most all VHF/UHF Talk Around radios made after 1997 have both capabilities, including the two models you listed. You have to take them to a tech to have them switched over/tuned. If you use these for a business radio make sure to check with the FCC to see if you need to change your business license to a 12.5 kHz business license.