After resoldering this the power output on 23cms went up from -23dBm to +3dBm.
Must check more carefully in future.
First Test - Poor Results
Re: First Test - Poor Results
The low power output via the RF Switch has been sorted. It was all due to R01 on the RF Board. A close inspection showed a poor soldered joint on the side to pin 10 of ADG904.
After resoldering this the power output on 23cms went up from -23dBm to +3dBm.
Must check more carefully in future.
After resoldering this the power output on 23cms went up from -23dBm to +3dBm.
Must check more carefully in future.
Re: First Test - Poor Results
Hi Nick
Pleased to hear that you have sorted that issue. Sounds like you might be ready to transmit. Have you anyone local enough to try the Portsdown barefoot on-air, or will you be building linears next?
Dave
Pleased to hear that you have sorted that issue. Sounds like you might be ready to transmit. Have you anyone local enough to try the Portsdown barefoot on-air, or will you be building linears next?
Dave
Re: First Test - Poor Results
Hi Dave,
Unfortunately there is no one near so I will have to get on with the amplifiers. I have Mitsubishi 60W modules for 2mtr and 70cm for the amplifiers and also got G4DDK preamps to make, so got some work yet. The nearest station to me must be Rob - M0DTS who I met up on the moors during one of the activity weekends.
With my location being where it is I expect my best results will be on 70cms and 2mtrs. Out of interest I had a look through my old logbook and noted that the first TV contact I had was on 70cms on 31st March 1981. This was of course B&W from an old Philips camera using (I think ?) a Microwave Modules transmitter. Things have moved on a lot since then.....
Nick - G4NKV.
Unfortunately there is no one near so I will have to get on with the amplifiers. I have Mitsubishi 60W modules for 2mtr and 70cm for the amplifiers and also got G4DDK preamps to make, so got some work yet. The nearest station to me must be Rob - M0DTS who I met up on the moors during one of the activity weekends.
With my location being where it is I expect my best results will be on 70cms and 2mtrs. Out of interest I had a look through my old logbook and noted that the first TV contact I had was on 70cms on 31st March 1981. This was of course B&W from an old Philips camera using (I think ?) a Microwave Modules transmitter. Things have moved on a lot since then.....
Nick - G4NKV.