If I were to **guess** how to derate the wattmeter slug for operation at 1253 MHz, I would assume a 3 dB rolloff per octave?

800-950 = 150 MHz

Midband = 875 MHz

DUT is 378 MHz above midband, or less than 1/2 octave (0.43 octave?) above midband.

If it's a first order rolloff then 3 dB / octave, so were about 1.29 dB low?

So we should be seeing about +19.3 dBm which is about 85 mW.

Let's go with 85 mW.

So now our attenuator to bring this down to 10 mW for the power amp needs to be -9.3 dB

Using the chart on the RFMicro AN0015 page, the closest attenuation value is -9.54 dB, which is close enough, and so the R's are;

Rp = 100 ohm

Rs = 66.67 ohm

We want to use one (1) 1206 for each Rp, and two (2) 1206's in parallel for the Rs (because that will lie flush with the 3 mm microstrip).

So for a single attenuator we need two (2) 100 ohm 1206's, and two (2) 133.3 ohm 1206's (130 ohm will be okay)." ## ISSUES 1. Accordin to DEM: "The 2303PA requires well regulated 13.8 VDC at 2A for full power output". Crap! We have a 12.0V out, 1.25A DC-DC converter for the **WHOLE** ATV system. What do we do now? Do we need to go Vbat through a linear regulator to get that? 2. The M67715 uses the "fin" as the ground connection. But we're using non-conductive white-heatsink grease for thermal contact? This can't be good. Does anyone have conductive heat sink grease? 3. What the heck is up with the ground connections on this board? The pads where their linear regulator sits aren't even plated through to the other side... but it's a plated through board. Are we SUPPOSED to connect DC ground through the bolt?!