Antenna SWR is giving odd readings

[WRCI796]

I have an Arrow OSJ 146/440 antenna on my roof.  It's technically for 2m and 70cm, but it ends up being perfect for MURS and some GMRS frequencies.

GMRS channel 1 (462.5625), channel 2 (462.5875) and most other GMRS channels have an SWR less than 1.3:1.   My two nearest repeaters are on frequencies 462.5750 and 462.6500, but they have an SWR of 2.03:1.  This seems odd to me.  The repeater frequences lay between standard channels, but the SWR jumps up. 

Has anyone seen anything like this?  No coaxes were changed or moved during all tests.

[OffRoaderX]

It sounds like you don't understand.

When you transmit on a [GMRS] repeater you are transmitting at 5Mhz higher.. So,  you are not transmitting on 462.xxx, you are transmitting on 467.xxx - and that is further away from the antenna's sweet-spot, thusly resulting in a higher SWR,

 

[SteveShannon]

3 minutes ago, WRCI796 said:

Yes, I understand the 5MHz shift, but when I'm transmitting through my SWR meter, it's measuring what I'm transmitting on 462.xxx MHz isn't it?  The SWR meter shows the frequency that matches my radio, and shows the watts, reflected watts and SWR for the shown frequency.  How would the repeater shift change the SWR?

 

When you’re transmitting to the repeater you’re transmitting on 467.xxx MHz. 
When you’re transmitting simplex you’re transmitting on 462.xxx MHz. 
The SWR when transmitting at 462 MHz could be vastly different at 467 MHz. 

[SteveShannon]

8 minutes ago, WRCI796 said:

I have an Arrow OSJ 146/440 antenna on my roof.  It's technically for 2m and 70cm, but it ends up being perfect for MURS and some GMRS frequencies.

GMRS channel 1 (462.5625), channel 2 (462.5875) and most other GMRS channels have an SWR less than 1.3:1.   My two nearest repeaters are on frequencies 462.5750 and 462.6500, but they have an SWR of 2.03:1.  This seems odd to me.  The repeater frequences lay between standard channels, but the SWR jumps up. 

Has anyone seen anything like this?  No coaxes were changed or moved during all tests.

SWR is measured when transmitting. For repeaters that’s 5 MHz higher 467.xxx MHz. 

[WRCI796]

Yes, I understand the 5MHz shift, but when I'm transmitting through my SWR meter, it's measuring what I'm transmitting on 462.xxx MHz isn't it?  The SWR meter shows the frequency that matches my radio, and shows the watts, reflected watts and SWR for the shown frequency.  How would the repeater shift change the SWR?

 

[WRCI796]

Sshannon and OffRoaderX, thank you both for your reply.  I understand now.