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Andy Brinkley wrote:The Mostar is not a "program and play" radio. Answers to your questions below:
Question #1 I have programmed several UHF & VHF Mostars with 2, 8, & 16 channels. The problem is they will only TX & RX on only one or half the channels I programmed in.
The channel capacity of the Mostars is limited by the channel selector and the microprocessor / eeprom.
The channel selector options were:
Single channel with no display or channel knob
Two channel model that utilized a pushbutton switch to select ch 1 or 2.
NVR series with a rotary channel select switch, 1 - 8 channels
Display series that utilized an LED readout, 1 - 32 channels
The microprocessors used were
1 - 8 channel microprocessor is 51-97003C11
16 or 32 channel microprocessor is 51-97003C09
The 32 option also requires some jumper changes on the command board and a larger eeprom.
So you will need to determine what is limiting your channel capacity - the microprocessor / eeprom or the channel selection method.
Question #2 Will the UHF Mostar cover the 450-470 MHz spread or will it only cover 450-459 / 460-470?
The Mostar receiver is only rated for a 3 mhz frequency spread. It will be deaf as a can be if you try to stretch it from 453 to 460 mhz freqs.
Question #3 Most of the UHF Mostars I have are real good on transmit but bad on receive unless your right under the repeater!
The Mostar needs a complete realignment unless your new frequencies are very close to the old frequencies. I would recommend purchasing a service manual along with the necessary RF test equipment to tune the receiver and transmitter. There are no external jumpers that affect the sensitivity.
Eddie wrote:First of all thank you both for your responce on the Mostar. Where are the RX adjustment tuning slugs located on the UHF Mostar? I have a VHF service manual ordered but would the RX slugs be located in the same place on the VHF models as on the UHF radios? I dont have a service monitor so I'm going to try to use another radio transmitting on the receive frequencie I need and a meter to adjust the RX. Do you think this will work?
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