Finally the phasing control box has arrived !
Very surprised to see this unit is 4 times larger than I expected; it measures 24x24x11.5 cm ( or something like a foot x foot x a quarter of a foot, for that matter).
This is the size of a medium HF rig.
- 300 kHz to 30 MHz (Switchable in two ranges; <5-10mhz>5-10 MHz)
- 3rd order output intercept: 32dBm each input, +38dBm both outputs combined
- Available phase rotation >360 degrees (between 500kHz and 15MHz)
Or better said, in what respect does this unit differ from its MFJ 1025/1026 counterpart?
- Phase adjustable through more than 360 degrees (MFJ does much less)
- Exceptional dynamic range (30dB more)
- Low noise floor (that is usuallly not much of a problem on the Low-bands)
- Provisions for optional high pass and band pass filters (see pics)
- DC controls with smooth action. Expandable for remote or external control
- Provides power and transmit muting for external active antennas
The MFJ is definitely not bad, but it has some drawbacks in practise. Adjusting both input gain setings and finding the right phase are a bit tricky.
The new NCC-1 has no seperate input gain seetings per channel, but a 'balance pot' instead.
Next it has a switch for swapping the antenna inputs (changing receiving direction on the spot !).
Looking at its internals, especially the transformers, this smells like W8JI design:
Looks like 2N5109's under those heatsinks.
- Provisions for the high pass and/or band filters
- Accessory entry slot for future remote control etc.
You can use it for (local) noise cancelling or, produce a steerable 2 element phased vertical RX array.
And there are some more applications.
What will I do with this unit?
First test this unit at a friends location to get a feel how it compares to its MFJ 'predecessor'.
Next I will start building a second 160m reference vertical in my front yard.
This will be >0.10 wavelength away from the backyard version which allows for a very good steerable phased vertical system (sort of very poor mens 4-square). PA3FGA has proven again and again that his double 160m reference phased vertical system works very well, expecially during contesting.