That was what I experienced. I moved my dish to 72.0°W (I was watching the NBC feed and other Stations before I unhooked it and attached the cable to the Birdog) and was not able to lock any signal even though I had active transponders programed into the system.well ynnedibanez, maybe your 6 year old birdog is not working properly after so many years or for some reason the LNB setup is drawing too much power. I have had TPs that do not lock but I have always found that it was related to the birdog list not being updated or accurate. Then I have entered a custom H TP as per one of the list available on internet and voilá it works , so signal was there , the meter was working as intended but its list was not accurate. I have only had to reset the meter once because for some reason it stopped detecting any signal at all on any sat on any polarity, even on the Hispasat fixed dish that I knew had strong signal. After resetting , all went to normal.
I have not checked on mine the voltage when H TP are selected though and mine is 1 year old only probably.
Anyway, I hope I get better luck with the FS1 First Strike Meter which I bought new from eBay. That should arrive in a few days.