Cobra 29 ltd off frequency?

[805 california]

So I adjust the transmit frequency dead nuts on 27.18500 and when I check it later the fluke frequency counter reads 27.18485? I let the radio warm up and I hook up rf sampler to frequency counter. How much off frequency can you be and still be OK on am? Thanks

 

[222DBFL]

You are letting the radio warm up for about an hour before you adjust anything aren't you? If not, give that a try. Most radios need some time to truly warm up to temp and stabilize. Might work.

 

[805 california]

You are letting the radio warm up for about an hour before you adjust anything aren't you? If not, give that a try. Most radios need some time to truly warm up to temp and stabilize. Might work.

10-4 thanks

 

[Robb]

I do not align freq unless the radio AND counter have both been on for at least 30 minutes. Also need to be done at a stable room temperature. Temperature shifts usually affects most radios, some will shift a lot and others shift little. Temperature also shifts the counter as well.

In AM mode, you will not notice freq shift in a radio unless it is more than 200hz +/-. In SSB mode, it is far more sensitive and more easily noticed.

 

[2RT307]

Probably stating the obvious, but make sure to use a plastic adjustment tool.

73,
Brett

 

[805 california]

I do not align freq unless the radio AND counter have both been on for at least 30 minutes. Also need to be done at a stable room temperature. Temperature shifts usually affects most radios, some will shift a lot and others shift little. Temperature also shifts the counter as well.

In AM mode, you will not notice freq shift in a radio unless it is more than 200hz +/-. In SSB mode, it is far more sensitive and more easily noticed.

10-4 thanks big dog