I'm not sure I understand what the problem shipping overseas is. I've done a
fair amount of eBay trading myself, and it's never been more than paying the
postage for whatever the destination is, and a single page form declaring what
the item is, and it's value. And many times, I haven't even
A properly designed microwave path is designed around a reliability
specification, such as 99.%, which translates to about 30 seconds of outage
per year. Frequency, weather, terrain, and equipment parameters are all taken
into account. I've designed many microwave links that meet or exceed
I probably could, but I never know what to charge for stuff like that.
Mel - WA6JBD
Mel - Looks like you could have a
side job re-working these things for hams.
Chuck
WB2EDV
A lot of us amateur microwavers retune circulators with external magnets. With
a handful of otherwise useless circulators, one could tear one apart, recover
the magnets, and apply them to the outside of the case of the unit to be tuned.
A network analyzer helps, so you can watch what's
Hi Eric,
The steel cases are not an impediment to the magnetic field, at least not
enough to make retuning impossible. Microwave type circulators are built in a
similar fashion, just smaller, and the technique is well known among those of
us who play in the microwave region. Just to give an
Most 4WEM muxes have at least two signaling configurations, usually described
as Type 1 and Type 5. More elaborate cards may also have Type's 2-4. They
describe various combinations of battery or ground on M, to idle or activate,
and battery, open, or ground on the E lead when idle or active.
The 60 watt option is a nice to have but not at all necessary. Mine is the
standard 3 watt version, so I use a 150 watt 40 DB attenuator (eBay). The nice
thing about the 8924C is that you can can compensate for the external
attenuator in both transmit and receive modes, so that the measurements
I recently located a very similar problem on a T-band public safety system,
only in this case, it was two transmitters in a 28 channel 800 MHz trunker that
were exactly 3 MHz apart that added that critical component to the mix. The end
result was that every t-band repeater at that site would
You might need to add a several DB attenuator
between
the pre amp and the receiver to keep from over
driving
the front end.
Not if you use a good receiver, or not use a preamp with
too much gain.
Bob NO6B
What defines too much gain can vary wildly. One trick I learned in
Well, maybe I've actually managed to do something different...
I've been adding a 1 pf chip cap (0603) between the oval shaped pad in the
filter, and the edge of the filter sectiont. One cap for each section. This
lowers the frequency down below 900, and then I use a dremmel with a sharp bit
Hi Bill,
I'm quite curious as to what you ran into when you attempted this. I have one
working, and as far as the number of steps taken to make it operable on 902, it
was pretty simple. The only thing I left out in my short list was bringing COR
out. Did I miss something, or did I just get
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