Re: One question only...
Hi Walt,toggle quoted messageShow quoted text
I will attach to this thread along about here. There is a lot of tail chasing and obvious disappointment among uBitx owners. I admit that I have felt some discouragement, too. But practical remedies are contained in the fog being spewed.
In the "good olde dayes" outboard filters were added between a (naughty)transmitter and the antenna. That approach can help a receiver as well. That was before we had CAT or even computers to support CAT. My approach won't support Cat. Or will it?
When there are several pieces of gear working as the ham station and each has it's own bandswitch we quickly get into the habit of checking all those bandswitches whenever we change bands. Newfangled hams don't have this experience and maybe are not even aware of the possibilities. I will be building the needed filters - bandpass models because of the uBitx sins - and adding them into the lashup immediately after the antenna terminal on the uBitx. Next will be the SWR bridge and tuner to the antenna so that the 50 ohm filter is assured of a 50 ohm load. That renders the uBitx impractical for some kinds of field operation. Too many googaws in the kit to drag up a steep hill or out into the forest. The local park might not be quite so bad. If the people who are working on mods for the radio get a good solution then I will probably make those modifications to mine. Meanwhile I am going to use it with external filters.
And now back to computer control of the station with those bandswitched filters living outside the radio. The VFO and Raduino are NOT going to accommodate that. But that is not where CAT originates. Make your Willie Gates special computer change the bands in your external filter for you while it is changing the bands in your uBitx. I see a lot of bragging about computer skills. So just do it. The old mechanical bandswitches still work for me:)
I hope this helps some people get past the disappointment and enjoy their radios on the air - free of worries over regulatory issues or being *bad* neighbors. As for me - I have already used my uBitx GQ receiver to help me troubleshoot another broken radio so I am keeping it:) And using it on the air.
Spectrum analyzers are great for quickly making graphical plots and even drawing them 'on-the-fly'. The same measurements can be made by plodding through a series of measurement steps and putting the results on graph paper (or in a PC spread sheet). It takes longer but most of us are NOT manufacturing radios or working on other folks' gear for pay. So the time required is much less critical.
Good luck and 73,
On 08/06/2018 01:54 AM, WaltR wrote:
I’d love to have a spectrum analyzer, but fortunately my wife has other
bark less - wag more