Remove encoders and fix more ground stations

[Capkirk123]

Needs KSP-RO/RealAntennas#45

Create new encoders (or lack thereof) for skopos comsats use.
Syncom voice is based on the Syncom FMFB tuner on USNS Kingsport. With a Eb/N0 of merely 6 db, it gives Kingsport enough link margin to work with historically accurate Syncom. 6 db S/N is still about enough for a simple voice link, which is all the Kingsport terminal could do anyway.

Early Comsat is based on the standard 10 db Eb/N0 figure used as the lower limit for many early satellites. This may need to be tweaked for balance.

70s Comsat is based on the Intelsat IV SPADE bit error rate specification. Assuming an AWGN channel, an Eb/N0 of 11.4 db should provide the specified bit error rate of 1e-7.

Since the rate 1/2 encoders provided by RA are no longer consuming bandwidth, I was also able to reduce the channel size or C-band and Ku-band to their ITU standard allocations of 1 GHz (500 MHz up, 500 MHz down). This reduces channel noise a little too, helping offset the loss of encoders.

Finally, I updated ground station performance for Point Mugu and Kashima to match their configuration during the Syncom tests as closely as possible.

Telstar and Relay are mostly unaffected by these changes, and can still meet their historical performance.

Syncom, between the updates to Point Mugu/Kashima and the encoder changes, now very closely matches it's historical performance in historical configuration.

Intelsat I/II might be underperforming a little. I'm unsure if this is because they never utilized their full transponder bandwidth in normal operation, or if my Eb/N0 limits are too strict.

Intelsat III/IV perform much closer to their historical specifications without being limited by encoders.