Technology

TS-850 Roofing Filter

by

One of the “must have” accessories for your TS-850 is certainly the DSP-100 Digital Processor, I was lucky to find one second hand years later it was discontinued.

But, what really makes a big difference are the set of optional crystal IF filters and the more recently added Roofing Filter.

Some years ago I heard about the filter manufacturer INRAD International Radio and I purchased some IF crystal filters for my TS-850. The reception perfomance improved dramaticaly. Those were filters easy to install, just plug ‘n play units.

Later, INRAD launched the roofing filter kit for TS-850, among other veteran equiment, that did not have the possibility to have roofing filters from the original manufacturer.

Read more

EA3GJO Baluns and Ununs

by

My good friend Salvador EA3GJO, from his retirement in Leon builds the best hadcrafted baluns available around here. He has some “standard” models and he can tailor your specific custom made unit according to your specific frequency, ratio and power requirements.

He has shared with us some units for testing and they are awesome.

To our request he built for us a special 4:1 unit with the terminals adapted to match a 450 ohm ladder line so that my friend Joan “Cullereta” EA3DJL can connect his antenna tuner to the ladder line, outside his shack, by simply running a short length of coax from the tuner, through the wall, to the ladder line bottom end.

So, if you have a tuner without built in 4:1 toroidal balun, and/or you simply do not want to pass your ladder line through the wall, one of this 4:1 can solve your problem.

There is also the 9:1 unit to use with long wire type antennas, and multiple models of baluns and ununs including full legal output (and more) current baluns to use in your beam.

I use one of these 9:1 unun with a 16,2m wire with excellent results on 30/40/60/80m and reasonable results on the other WARC bands.

Contact Salvador through the email specified at his QRZ profile (login required) for more information on available models, specific requests and ordering information.

We do not have any commercial nor business relationship with Salvador.