Question about calculating offset using the FREQUENCY and INPUT fields

[bwanamukubwa]

Hello all,

I looked to try and find out what a nearby repeaters offset is and could not find it. I did realize that in the databases, there is a drop down to show or hide the input frequency. So i took the information from the databases shown here minus ALPHA TAG, etc

Frequency | Input | Type | Tone | Mode
154.43 | 153.95 | RM | 205 DPL | FMN
155.715 | 159.21 | RM | 38F NAC | P25

and tried to input it into Chirp as per the attached image. I then uploaded the image to my UV-5r+

However, I cannot hear anything but it seems the unit receives a signal during a transmission because the green light on the front comes on - just no sound.

I would appreciate any feedback as to what i don't have set correctly. Thank you.

 

[mikewazowski]

Thread moved to Budget and Entry Level Transceivers forum since this is not a scanner programming question.

 

[kma371]

Hello all,

I looked to try and find out what a nearby repeaters offset is and could not find it. I did realize that in the databases, there is a drop down to show or hide the input frequency. So i took the information from the databases shown here minus ALPHA TAG, etc

Frequency | Input | Type | Tone | Mode
154.43 | 153.95 | RM | 205 DPL | FMN
155.715 | 159.21 | RM | 38F NAC | P25

and tried to input it into Chirp as per the attached image. I then uploaded the image to my UV-5r+

However, I cannot hear anything but it seems the unit receives a signal during a transmission because the green light on the front comes on - just no sound.

I would appreciate any feedback as to what i don't have set correctly. Thank you.

Use a calculator to find the difference between input and output?

 

[mikepdx]

Sounds like the wrong tone.
There are errors in the RR dB.

When the RX light is on and you push the 'monitor' button
do you hear anything?

 

[ka3jjz]

I don't believe the UV5R supports P25 decoding - which would be required for that second frequency...Mike

 

[dmg1969]

Are you using this as a scanner (moderator said this was posted in the scanner question section). I just bought a UV-5R to use as a makeshift scanner. Was the radio plugged in to the USB cable at the time? I found, when programming with the USB cable hooked up to my computer, it would still receive. The green light would light and the display background would change color, but no audio was heard.

If thIs is NOT your situation, try removing the tone and seeing what happens. If using as a scanner, you don't need to worry about the input frequency.

 

[jaspence]

Offset frequency

There is no need or use for the offset frequency if you are just listening. PL or DCS is not needed unless another nearby system is using the same frequency and you don't want to hear them. None of the inexpensive ham radios I know of can decode P25, and even a high end amateur transceiver cannot monitor P25. You need a digital scanner.

 

[ramal121]

Your DTCS polarity is set for reverse (or inverted). Change to normal which is, well, more normal as far as usage.

 

[teufler]

if you are still not receiving audio, with all the "tricks " suggested, plug in your ear phone speaker mic that came with the unit. Some of the uv-5 radios, have troubles with the earphone jack. Seems after programming, the netal contact points, in the speaker jack, are still open, hence sound goes to a external speaker that is nor installed, hence no sound. If you have an external speaker jack, insertyed iut several times in the radio. I have found that this helps return the tabs to normal.

 

[KC9HI]

Hello all,

I looked to try and find out what a nearby repeaters offset is and could not find it. I did realize that in the databases, there is a drop down to show or hide the input frequency. So i took the information from the databases shown here minus ALPHA TAG, etc

Frequency | Input | Type | Tone | Mode
154.43 | 153.95 | RM | 205 DPL | FMN
155.715 | 159.21 | RM | 38F NAC | P25

and tried to input it into Chirp as per the attached image. I then uploaded the image to my UV-5r+

However, I cannot hear anything but it seems the unit receives a signal during a transmission because the green light on the front comes on - just no sound.

I would appreciate any feedback as to what i don't have set correctly. Thank you.

First, you should only program the TX frequency if you have a part 90 approved radio (many UV-5R variants don't have the FCC ID) and permission from the licensee to use the frequency. Otherwise Duplex should be set to "off" (disable TX)

Second, the UV-5R variants only RX and TX analog FM, it will not work at all on the 155.715 MHz frequency that uses the P25 mode.

With CHIRP there is absolutely no need to calculate the offset for either of these repeaters. CHIRP will do the calculations for you.

Frequency: {enter your RX frequency here}
Duplex: {set this to "split"}
Offset: {enter your TX frequency (the repeater input) here}

Now click on the [Refresh] button. Duplex and Offset will be automatically updated.

So...
Frequency: 154.430000
Duplex: split
Offset: 153.950000

[Refresh]

Will become...
Frequency: 154.430000
Duplex: -
Offset: 0.480000

Jim KC9HI

 

[SCPD]

If your using as a scanner I suggest setting the duplex to off or none in chirp. It's easy and you should do this part. so you don't key on something your not suppose to. I keep seeing new hams wanting to do this and say we'll if anything ever happens I'll need to communicate. Really? I doubt any public safety would talk if it was that bad and in any case you needing help in a mass situation would be least of there priority call worries.