Re: Best pc design for SDR

Augusto <hb9tza@...>

Yes I know,
I have used lot of such devices / softwares, and know how they are.
Lingua took really a bit to be able to set it at its best, but that changed at every DX QSO.
Some were really impossible to do without Lingua on, and that was just surprising how it changed the understanding of the speech; adjustments are a bit critical, and it requires quite a bit of practice filtering and setting, before to be quick enough not to loose the QSO: Mostly, it was affected by bandpass settings, it seemed better, most times, to have a wider bandwidth and low NR settings.
Some other QSOs were impossible to do with Lingua on ... no matter of settings, surprisingly enough.

I did not test it with FM U/VHF as it does not interest me at all, I used it also on the bench with a step attenuator on receiver, with variable noise and bandwidth, and also used it on real conditions, hunting for DX and / or very poor signals on phone band. Sometime I was enthusiastic, others not at all, HI .

After two months of learning and experience with it, I handed it to a friend that was also really curious to test it on phone DXs on low bands, mostly 160m .
He tested it extensively and came to my same impressions of use, and of hardware.

I guess  I will give it next another try on the field, using it on /P in some HB9WFF/p club activation, then decide to keep it or to sell it .
It requires to go around with cables, small jack adapters, a small separate battery: it is not very practical to go around with all that mess!
Were it also useable for CW, at least, it could have saved some other device to be carried with in the backpack; but it was clearly stated that was not for CW , anyway.
I feel that with such a powerful system, as they say, it would have been practical to switch the firmware to do that, too.

But anyway, these are my impressions, mileage may vary, others may feel it as a miraculous cheap device.
73 44 , Augusto

Il 07/02/2018 15:58, Siegfried Jackstien ha scritto:

the dsp in mchf (and also in the named other external devices like lingua etc etc) can not dig out a signal that is not readable without (complete burried in noise) ... it just can help a bit ... there must be a tiny bit signal to noise ratio that the dsp can work with ... then it works wonders ... it really helps to reduce the noise so the ear is a bit more relaxed to concentrate on the real signal ... it really "serves your nerves" :-) ...

dg9bfc sigi

Am 07.02.2018 um 14:01 schrieb Augusto:
Oh yes
I was looking on the M0NKA page short after posting my message, and I feel it's very interesting.
Sorry to see oncemore the idea stolen for eastbiznez ... we OM should not buy if they do not pay royalties or the due ... but this is another issue.
You name the Lingua SprachExtractor ... I have it. But ... 
It's true, I did with it some phone SSB QSO that would already not be possible, no good for DX hunting in pile-up; also found many other negative points.
I gave it to a friend, good DXer, to test it; and he also was not 100% ueberzeugt damit .
For that price, I am not fully satisfied with it. It could be IMHO a bit better issued; it's only for phone, maybe better for FM phone by local chatter, DX is another thing.
That hartdware could also have a switch and another firmware for CW, this would have made it a complete devbice; also, no stereo phones output youmust use adapters and these with time break the jack.
You have continuously - in DX listening - to move regulations up and down, and these potentiometer seems not of the type that support a long intensive use, and they ate also soliciting the printed circuit board.
An internal cell phone type li-ion battery could have a good solution instead of the 12V supply. And some other idea about its hardware and firmware.
Anyway, they are IMHO , FWIC ...
73 44 , thanks Siegfried!

Il 07/02/2018 14:07, Siegfried Jackstien ha scritto:

you never heard of the mchf???

chris changed the design when changing from 0.6 to 0.7 version of his boards

i liked more the older design 0.3 to 0.6 boards (we started out project group with 0.4 version)

the firmware now has so many functions it is a bit to much to name them all here

but when you campare an mchf with old firmware with one with actual firmware you have two completely different radios ... newest firmware has such a nice noise reduction that it is nearly as good as prachextractor lingua, bhi noise surpression speaker or similar (jps nir 10 or 12 as another example) ...

i can really dig out a signal that is barely readable in the noise

if you prefer cw ... a nice peak filter helps to lift up a tiny signal (no ringing!) ... etc etc

just wait a bit till we have finished the backend for the ovi40sdr (that is the mchf with turbo ... grin)

frontend is finished (ui board) and can be used with the rf board of mchf (backwards compatible) ... new rf board will have more power and better filters (still in alpha stage)

cause the firmware is open source and there is a programming community now of over a dozen programmers there is sometimes 2 or 3 versions of new firmware a day!!! the fw is RUNNING forward in seven miles boots

what i like is that you need no pc anymore for digital modes ... just a (wireless) keyboard

size of mchf with battery pack included is like a tetra pack (1l milk or juice box)

when you need some more infos (besides what you find with google) drop me a direct mail

dg9bfc sigi

Am 07.02.2018 um 10:59 schrieb Augusto:
HI Siegfried,
MCHF? I do not know it;
"muscled" seems vy interesting, keep me informed pse.
I also used a Archos 7", android 4, with companion bluetooth keyboard shell, otg cable, the FT-817, two cell p
10Ah power packs with some homebrewed USB adapters to put them in series for the rig. Nice, small and light system.
73 Augusto

Il 07/02/2018 11:19, Siegfried Jackstien ha scritto:


just use the mchf instead

cw decode on screen

rtty rx and tx with no pc

psk31, 63,125 .. rx and tx with no pc

.... plus freedv!! (digital voice over shortwave)



ps in our local club we are developing an mchf on steroids ... bigger cpu , bigger screen, more output power
Am 06.02.2018 um 19:42 schrieb Augusto:
Thanks Mats for the Infos! Very appreciated.
I knew about the controller in the battery, since Zenith Pentium2 black&white laptops years ago, hi ...
Anyway, many laptops I had these times ran without battery no problems; and some these times had a 12V NiCd battery so I used them no problem with the direct connection to a car battery.
But today the laptops are of course a lot much complex. I will try that old laptop, then see what will happen.
The pairing with an FT-817 seems me very actractive: a laptop running FT817 commander or even HRD and a small giant like the FT-817 may be very interesting, specially with digimodes or cw.
73 44 de Augusto HB9TZA / I2JJR

Il 06/02/2018 20:18, Oidar ha scritto:

Many modern laptops "talks" with the PSU over the DC cable to adjust optimal performance and charging settings, depending on the capacity of the power brick. Also many laptop batteries contains a microcontroller that reports some data about status, capacity and often including serial number.

I have a not so fresh HP laptop that, after some upgrade simply refused to charge in the docking station, and i gave up after fiddling with it for some time.
The same power brick fitted directly in the computer works well.

SO, you may bump into unforeseen problems when trying an alternative powersupply or battery, in order to reduce the RFI.


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