[TenTec] Jupiter swr

[Larry]

I notice after building my 40m dipole that the swr as seen by the jupiter is lower than the swr as seen by my analyser.The jupiter also shows a lower swr when speaking into the mike than it does when in the tune position.Its not really important to me since its quite a bit below 2to1 but I asumed all these readings would be some what closer than what they are.Is there a simple answere for these differences ?
W5wlb Larry