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It may be that the freq entered or programmed into it is beyond the expected range of that radio. Need more specific details. Usually probs of this nature involve a voltage controlled oscillator whos voltage varies according to the freq. It needs to be within a certain voltage range between the lowest and highest programmed freqs....if not the unlock message appears. Look up the radio on the net and determine if you have programmed it with the freqs it was designed to operate on.... first. Is it UHF or VHF?
If I'm not Wrong, You have the UHF Model radio, and therefore can't program VHF frequencies as it's the wrong band. If I am wrong, then you have a dual band radio, which should be pre-programmed with all the correct frequencies for both 2m & 70cm bands.
Sorry, the serial number does not tell the frequency band of the radio. From this serial number I can tell you it is likely an SP50 radio, and it wwas produced Nov. 1996. You would need the model number to know the frequency band. The model number of an SP50 radio beginning with P93 would be VHF, and if P94 it would be UHF.
Note: With the mandated change to narrowband by Jan. 2013, only SP50 radios with a 00 (double zero) in the model number will do the new narrowband. Those models on wideband would have a 20 (twenty) in the model number. Example: P94YQT20AA2 would be a wideband UHF radio.
The frequency range and operatngmode of the two radios are compatible. To get the Radius operating on a GMRS channel you'll need a Motorola programming cable and software, OR a trip to a Motorola dealer for frequency programming. Considering the cost involved, the 2-watt output of the Radius, and the 1-watt output of the Talkabout, you would be better off performance and cost wise buying a pair of 5-watt GMRS portables. BillB
If your GP340 is a UHF model, YES, you can have it programmed to match your TalkAbout radios. And yes, the GP340 has programmable privacy code capability.
If you do not know if your GP340 is VHF or UHF, you can tell by looking the model number, it will contain the following pattern: __H25RCC4AN3__. UHF models will have the letter R after the "25". VHF models will have the letter K.
When you have your GP340 programmed, the power setting will need to be turned down to the appropriate level to match the TalkAbout radios. Both for legal reasons, and also to protect your TalkAbout radios. You will not want the powerful GP340 to overpower the PA (power amp) in your TalkAbout radios.
Not sure what you want.....VHF band ius approximatly 130mhz to 175 mhz..... in that VHF band there is a commercial VHF band aprox. 155 mhz to 175...... the amateur radio vhf band is aprox. 135 to 150mhz.
With amateur radio, any freq in that range can be used...... with commercial radio the FCC cangive a company any freq. in that range also.
If you are looking for FRS/GMRS frequencies they are UHF freqs not VHF.
So I'm not sure exactly what you want......sounds like you might want to program in FRS freqs into an Icom amateur radio. If thats the case you will need an Icom that will do UHF freqs.