See http://home.alphalink.com.au/~parkerp/projects/projmicro40.htm .
Also: https://aa7ee.wordpress.com/2013/10/19/the-vk3ye-micro-40-dsb-transceiver/ .
Well
designed DSB transceivers are much simpler than SSB rigs as no SSB
filters and mixing to final frequency is needed. They must not be
over-driven to avoid a spreading signal. The PA needs to be linear too.
These issues being carefully considered, you end up with a rig that has
the same bandwidth as an AM rig but with a suppressed carrier. DSB
transmitters are usually received as an SSB signal. The downside is that
if a simple direct-conversion receiver is used then there is no
rejection of stations sitting on the other sideband. So, they are best
on quieter bands, rather than busy HF bands. Bands like 10m, 6m and 4m
are probably good candidates.
Although not impossible, it is quite difficult to demodulate a DSB signal on a simple direct-conversion receiver. DSB rigs are ideal as simple transceivers to communicate with SSB rigs.
24 Jan 2015
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1 comment:
Yes Roger, DSB is really a cheap and effective alternative especially for novice. A well designed rig is usually easier to duplicate and performs well. I do like to recommend SPOTTO DSB at ham radio India site. It is a simple high performance transceiver and the beauty of the design is its simplicity and use of common components.
73s
Donald.R
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