The instrument doesn't include a mechanism to change file names by itself since it isn't usually used for long-term storage of measurements. However, by using Master Software Tools, you can connect to the instrument and open the file and rename it. Then use the | Sync | Upload Active Window | to put the renamed file back into the instrument. The file with the old name will still be in the instrument so if desired, you can delete the old one.

In the frequency menu there is a soft key called "Freq Step".  It has a default value of 1 MHz.You can change that value to anything you want to a resolution of 1 Hz. Once you have that value set to your channel spacing, set the center frequency to your first channel. Then use the up and down arrows to move in the step size you entered. Make sure the center frequency is the active parameter before pressing the up or down arrow. You can also change a parameter you didn't intend. The Frequency step can also be used to change start frequency and stop frequency.

Yes, an external bridge is needed to make the measurement. Connect the bridge between the TG output and the spectrum analyzer input. Put a short circuit on the test port. In the Tracking Generator menu press the "S21 Insertion Loss" soft key followed by the "Normalize Off On" soft key to do a normalization sweep. You should end up with a flat line at the 0 dB point on the relative scale that will be displayed on the right side of the screen. Replace the short circuit with the device to be tested and directly read the return loss results in dB.

Yes, with limitations. The oscillator being measured must have worse phase noise than the instrument does. The measurement of phase noise is done in units of dBc/Hz at a particular offset from the carrier. Set a reference marker on the peak of the carrier and turn on the associated delta marker. Set the delta marker offset to the point at which you want to measure and change the marker type to "Marker Noise".  The delta marker value will show the measurement in dB, which is dB below the carrier amplitude normalized to a 1 Hz bandwidth. Use a trace averaging value of at least 20 to minimize amplitude flucuations.

The tracking generator frequency is generated from the same local oscillators that tune the spectrum analyzer. Consequently the frequency error between the two is zero. They are always on the same frequency.

There are no plans to support ATSC-M/H standards at this time.

We recommend a Scandisk ultra 2.

Yes it is supported.  You can enter the frequency or you can select the signal standard and enter the channel number. 
Here are the signal standards:

CDMA2000 Class 5 (NMT-450-20 kHz)- Uplink

CDMA2000 Class 5 (NMT-450-20 kHz)- Downlink

CDMA2000 Class 5 (NMT-450-25 kHz)- Uplink

CDMA2000 Class 5 (NMT-450-25 kHz)- Downlink

As of June 2009 the Remote commands for Quasi-Peak detection are being developed. They are not currently available. Expected date for these commands does not have an official target but we hope to have them by end of August, 2009.

Option 78 provides SFN measurements on a DVB-T/H SFN network to measure multi-path related issues. For modulation analysis and RF measurements, Option 64 is required, which does support 6 MHz DVB-T bandwidth. We've only heard of some trial DVB networks in the US which are no longer operational. However, please note that ATSC is the digital broadcast standard in the US.

The noise floor is caused by thermal noise generated in the instrument's circuits. When you select a wider resolution bandwidth, more noise comes through the filter and causes the noise floor to rise. When you add an internal input attenuator, modern instruments respond by increasing IF gain to maintain a constant reference level. The increased gain causes the noise floor to rise by an amount equal to the added attenuation.

An internally generated spurious signal will be at a fixed frequency. Put a marker on the signal and center the signal on the display by using "Marker Freq to Center". Zoom in on the signal by reducing the span. If the span was very wide to begin with, you may need to recenter the signal once when the span becomes significantly narrower. An internally generated spurious signal will stay centered on the display as the span becomes very narrow because it is tied to the instrument's reference oscillator frequency.