AM Station

Collins 75A-3
B&W 5100
RME-6900
75A-3
I chose the 75A-4 as one companion receiver to the B&W 5100. It is a sensetive and selectivie AM receiver if you don't mind the narrow selectivity of the 3.1 KHz mechanical filter. I don't have a wider mechanical filter which would make full double-sideband copy possible. Hower, with the excellent 3.1 KHz mechanical with its steep skirts, tuning either sideband of an AM signal is each.
B&W 5100 Transmitter

The engineers got things close to right in the design of the 5100. Tuning is non-critical, stability is satisfactroy, even on 10 meters. There is an abundance of modulation and adjustment is easy. This transmitter does not feature speech limiters or any of the popular modulation tricks. It's just pure audio modulating a pair of 6146's finals. The design is simple and effective. Other manufactures could have learned a lesson or two from this design.
RME 6900 Receiver
When I was in high school, I remember visiting the local ham store. Those were the days when there was a lot of new equipment available as well as lots of used gear. In the new equipment department there were two receivers that left a lifelong impression on me. One was the incredible Squires-Sanders SS-1R featured at another operating position in my shack. The other was the RME 6900.
While this reciever appears to be a Collins competitor with its dial layout, there is no performence resemblance. In truth, the 6900 is more in the class of an SX-101, NC-303, and similar receivers. It is a well made, double conversion circuit and it works well on all modes. Selectivitiy is typical of other recievers using a low frequency i.f. with four tuned circuits to achieve acceptable selectivity. The tuning dial is accurate and easily read to within a few KHz on most bands. The semicircular dial is only for logging. It's markings are meaningless. It is not an accurated calibrated dial giving 1 KHz readout like those of the 75A-series receiver or the SX-115.

A few special features include variable BFO injection and a combination mode-selectivity control. There is a notch filter and the tuning dial is huge, taking up nearly the width of the front panel.
The 6900 is RME's last attempt to capture a segment of a quickly changing market, but it was too little, to late. That's probably why you don't see a lot of them around these days.


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