A really interesting video, thank you for sharing it with us. I noticed that during the power output checks you did not change the frequency on the power meter. Unless you have a very flat sensor you will not get the best accuracy using the same correction factor for all frequencies. Regards, David
Greetings David, the power sensor I used is the HP8482A. You are correct, I only used the correction factor listed on the unit from the factory (100% @ 50MHz on down to 100kHz) so I just went with it. I have three power sensors and this is one that is due to be calibrated again. Thanks for watching!
Point of order: The exact attenuation of the 40 dB pad can be set (offset) as well for increased accuracy in the power meter. Maybe that was done as well? PS. Also coax loss, more apparent on the higher bands.
The HP 437B does have an offset function that allows for a +/- 99dB offset to be entered, I was using a 40dB offset in this case. The Bird attenuator (LUC-002-E) does have an attenuation table, but nothing given for frequencies below 450MHz (@ 450MHZ the calibration table lists 40.38dB) so in this case I just winged it.
This is one of those videos that creeps me out because it was a suggested video, that came a couple hours after having had a conversation with an Elmer about getting those filters … and neither of us had our phones with us.
Good Morning, I purchased the filters off of eBay, the prices were about $125.00 or so each, about what they were new. These filters made a big difference on crowded bands and have breathed new life into my 706MkIIG. I have the CR-282 high stability option but have not installed that option yet. The last module I plan on installing is the speech module that announces operating frequency and mode.
thank you. very informative
A really interesting video, thank you for sharing it with us. I noticed that during the power output checks you did not change the frequency on the power meter. Unless you have a very flat sensor you will not get the best accuracy using the same correction factor for all frequencies. Regards, David
Greetings David, the power sensor I used is the HP8482A. You are correct, I only used the correction factor listed on the unit from the factory (100% @ 50MHz on down to 100kHz) so I just went with it. I have three power sensors and this is one that is due to be calibrated again. Thanks for watching!
Point of order: The exact attenuation of the 40 dB pad can be set (offset) as well for increased accuracy in the power meter. Maybe that was done as well?
PS. Also coax loss, more apparent on the higher bands.
The HP 437B does have an offset function that allows for a +/- 99dB offset to be entered, I was using a 40dB offset in this case. The Bird attenuator (LUC-002-E) does have an attenuation table, but nothing given for frequencies below 450MHz (@ 450MHZ the calibration table lists 40.38dB) so in this case I just winged it.
This is one of those videos that creeps me out because it was a suggested video, that came a couple hours after having had a conversation with an Elmer about getting those filters … and neither of us had our phones with us.
Great video! Where did you get the filters? I’m wanting to do the same.
Good Morning,
I purchased the filters off of eBay, the prices were about $125.00 or so each, about what they were new. These filters made a big difference on crowded bands and have breathed new life into my 706MkIIG. I have the CR-282 high stability option but have not installed that option yet. The last module I plan on installing is the speech module that announces operating frequency and mode.