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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  UHSDR Firmware (Moderators: DF8OE, DL1PQ)  |  Topic: Bad PA job outside of amateur bands <- zurück vorwärts ->
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SP3OSJ
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Bad PA job outside of amateur bands
« on: 13. May 2018, 21:03:03 »

Hi
« Last Edit: 29. June 2022, 21:06:56 by SP3OSJ » Logged
DF8OE
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Re:Bad PA job outside of amateur bands
« Reply #1 on: 14. May 2018, 07:27:19 »

Hi Artur,

not a bug - its a feature. Power out level is reduced dramatically outsinde the amateur bands included 11m band. There is no country on our planet where you can legally use a homebrew rig for 11m working.

It is a safety feature so that nobody can xmit there by accident. And there is no reason for transmitting outside the bands with high power  . Only for measurement purposes - a few mW is enough.

vy 73
Andreas
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Re:Bad PA job outside of amateur bands
« Reply #2 on: 14. May 2018, 12:02:14 »


on the other hand, if you want to drive a transverter I could think of the use of such frequencies. Obviously extreme high levels shoudl not be useable

Somethink like 26.....30 MHz to cover 4 MHz in the 70 or 23cm band. Or maybe even 144.....148 MHz transverters,

For 11m... well I fully agree on that one. (including the other bands, like 45m, etc the pirates seem to use)
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DB4PLE
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Re:Bad PA job outside of amateur bands
« Reply #3 on: 14. May 2018, 15:43:50 »

Hi,

for the transverter use case you are right, and this might be a use case which we could support at some point. I indicated that to Artur, SP3OSJ in a different there in this forum, where I also mentioned the low power rule outside amateur bands.
In order to have somewhat consistent power output and TX IQ across a larger freqency range, we would need to add more calibration points and some other stuff. So it is most likely not a simple `we turn that "stupid" limitation off` thing.

73
Danilo
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DF8OE
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Re:Bad PA job outside of amateur bands
« Reply #4 on: 14. May 2018, 18:42:48 »

And for the 1000th time I write:

I do not think it is a very good idea to take mcHF for transverter use or put a big PA to it. Signal quality - especial on higher frequencies > 20MHz - is not good enough to do so.

EDIT:
Bandfilters are designed for HAM bands usage. Some "outside bands" are covered because of the bandwidth - but most are not. So you will be captured in mountain-like peaks and deep dampings. If you want ot use transverter you have to do more hardware modification:
- add two low level output/input which are connected directly behind TX mixer and before RX preamp input
- do filtering exactly to the used span externally
- reduce modulation level so that you will reach better signal quality

I think it would be better to use another rig for transverter purposes...

vy 73
Andreas
« Last Edit: 14. May 2018, 20:01:32 by DF8OE » Logged

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