I thought my Wavebubble had ceased to function recently and found I couldn't block an iPhone. Everything I could measure was fine so I borrowed an SA.
On first look I thought it was because the high VCO power was substantially less than the low range VCO. I put the iPhone into field test mode and couldn't shift it off 3G (Vodafone UMTS). After being more critical (accurate) with the programming frequency choice I could bounce it repeatedly off UMTS. It would then shift to the 8/900 MHz range and I could easily knock it off that. It then however went up to the 1800MHz band and I have problems with that. The high level VCO output seems very non linear and I cannot seem to block 1800 and 2100 at the same time.
Anybody ideas here? I thought of reducing the tuning voltage frequency. Might that help? Any recommendations for something to try while I have the SA?
The VCO power specification is only 0.5dB less that the low range one but I have always had substantially less.....
I was half thinking of adding a second main board with another VCO in the 2GHz range and maybe one for 5GHz for the N Wifi band!
The 5GHz VCO spec is very low power <1dB and 300mA! Any ideas if it would be even possible to amplify to useful levels?