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Re: Assembly manual Rev 1.08
Hi Dee The gain of the I side is 3x higher than it should be. But this is somewhat cancelled out by the extra resistance (3.3K instead of 1K) in series to the I-Q balance trimmer pot. The I-Q balance can usually be adjusted as normal. The net result is that there is hardly any impact. This is why it went unnoticed for so long. There would be a slight decrease in dynamic range. Unlikely to be noticeable in most cases. Generally if you have already built the radio with R19 and R25 swapped, and all is working fine, then I would suggest leaving it as it is. That's what I have done (i.e., left it alone) on both my QCX currently operational here (20m and 30m). Anybody who builds the kit using manual 1.08 will automatically get the resistors the correct way around.? There will not be any PCB revision to change the silkscreen in any future PCB manufacturing runs. The manual (1.08 and on) has already been amended to fix the issue. 73 Hans G0UPL? ? On Dec 8, 2017 6:55 PM, "QRP_nut" <raspiham1973@...> wrote: Hans, |
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Re: QCX modification for 40 Meters
Joel Fournol
开云体育God kv?ll Daniel, Le 02/12/2017 à 15:18, Daniel Ekman
SA2KNG a écrit?:
Om du vill prova att k?ra den innan du f?tt encodern s? g?r det att g?ra med str?mbrytare ist?llet, googla encoder s? ser du kanske hur du beh?ver sk?ta dom f?r att ?stadkomma samma sak som att rotera encodern. |
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Re: FT8 for U3?
Sorry,too many QSO modes as it is and most operating,(not saying you guys) are using WAY too much power and not following the band plans.
Each new QSO mode to me looks more like a bunch of seagulls swooping in to snatch up the french fries in the Mc Donalds parking lot and when they are all gone,they move to somewhere else to destroy.WSPR,especially 30m is being killed with JT65 users daily...right directly on top of the WSPR segment along with RTTY to boot.Then the occasional JT9 where some for whatever reason think 100w is a good idea.All you get is a splattering mess free for all almost "contest" like. How many contacts does one need in an hour and how important is it? Not that important where you come and destroy it for the QRP folks. This particular forum(I think) is about QRP,not QSO modes...or am I wrong here? The original suggestion to this topic is using FT8 mode on the U3S QRP Labs kit. Now if a QRP 100mw signal on a piece of magnet wire dipole is QRM? But negligent QSO mode operators running nutty power levels,towers,beams transmitting anywhere they want are the victims ? Something is wrong with the thinking here. I been running 20mw JT9 beacon for over a year now occasionally getting stomped over by JT65/PSK31/Winlink/RTTY and the crazy part is I still copy them WITHOUT my antenna connected in my basement...the definition of QRM. |
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Re: Assembly manual Rev 1.08
George H. Gates
Tnx Hans
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Re: Assembly manual Rev 1.08
Hi George There is a description of the changes, on the last page of the manual: 1.07 17-Oct-2017 Changed Q6 transistor to MPS751 (was MPS2907 in first kit batch) Corrected typo on p83 para 3 “in the event that” 3.3K R44 was mistakenly called R34 on parts list 1.08 23-Oct-2017 Swapped R19 and R25 in parts list and sections 3.22, 3.23 to match error on silkscreen (silkscreen prints for R19 and R25 were swapped). Note in section 3.41 that C47 can be mounted vertically above SN 500. The important one, is about swapping R19 and R25.? 73 Hans G0UPL On Fri, Dec 8, 2017 at 3:56 PM, George H. Gates via Groups.Io <w2bpi1@...> wrote: I printed Rev 1.06. What has changed in the newest version (Rev 1.08)? What pages do I need to reprint? Tnx 73 Geo/W2BPI |
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Re: FT8 for U3?
On Fri, Dec 8, 2017 at 12:33 am, Ernie Hollingsworth wrote:
What nights and band/freq are you on ?Opera2? Would like to try to spot you. 73Ernie, Been bouncing back and forth between Opera 40m and testing this FT8 on 6m band.Looks like 6m is not too bad but have to run around 50 watts. The big stations seem to be working 6m which helps.Seeing the same stations as I did when MSK144 was popular.My simple dipole is doing ok. I do not have to setup the U3S for 40m,I only used that band because there are no others anywhere else :) Maybe 3-4 total each day using 40m band. I`ll setup elsewhere if you have a band in mind? Jim |
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Re: Kit Building
You might try Dale, WC7S. He can be contacted at daleputnam@.... He has done kit building for our customers, many times.
ken - wa4mnt |
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Re: FT8 for U3?
To fill a band with automated beacons may be pleasing for an individual for a short period of time, but in the grand scheme of things it's QRM. Our bandplans are very flexible because we behave responsibly.David, Yes WSPR is the obvious choice. It seems to me that many of the other mode "grabbers" are to alert users that a QSO with a spotted station is possible rather than just to test propagation? 73 Alan G4ZFQ I wonder if there was an automated voice recognition program available, would it be acceptable to leave a voice keyer running 24/7 using up 2kHz of bandwidth just because there are 'vastly more people receiving'? |
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Re: FT8 for U3?
David Bowman
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Re: FT8 for U3?
From: TrueBlue "It's useful because there are vastly more people receiving/reporting the FT8 signals and therefore giving a more realistic picture of the prevailing propagation on PSKR and other sites.? Fast or not, if the beacon's signal's received, it's reported.? That's all that matters." Having thought about this for a couple of days, I think think " That's all that matters"? is inaccurate. It's worth considering what the intention of the mode is before we use it. FT-8 is a fast QSO mode, whereas WSPR is a more sensitive mode designed for propagation study. To fill a band with automated beacons may be pleasing for an individual for a short period of time, but in the grand scheme of things it's QRM.? Our bandplans are very flexible because we behave responsibly. If you are interested in propagation, WSPR is the obvious choice, its a few hertz wide rather than 50Hz. I wonder if there was an automated voice recognition program available, would it be acceptable to leave a voice keyer running 24/7 using up 2kHz of bandwidth just because there are 'vastly more people receiving'?? Thanks David |
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Re: Moving the CW filter center frequency
Hi Andy I would suggest try 400 and 600Hz for the audio phase shift adjustment. If you left it at 800Hz it would not be bad, either... I do not know really the answer to this and I have not tried it myself. So you would probably have to experiment a bit with it.? There are some YouTube videos by Giulio IK2DED, he modified his QCX-80 for 540Hz CW - see? for example.? 73 Hans G0UPL On Fri, Dec 8, 2017 at 1:06 PM, Andy V. Borisenko via Groups.Io <rw9rn@...> wrote: yes Hans, I know that need to change R according to the table from ke7xr. |
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Re: Moving the CW filter center frequency
yes Hans, I know that need to change R according to the table from ke7xr.
thus, menu items 3.8; 4.8; 8.2 i make 500 Hz. and menu items 8.3 Phase adj Lo freq: audio freq forlow audio phase adj (600Hz)
8.4 Phase adj Hi freq: audio freq for?high audio phase adj (800Hz)?leave the default values??or change accordingly by 400 and 600 Hz? how right? |
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Re: Moving the CW filter center frequency
Hi Andy You need to change the hardware, to change the CW filter center frequency, see?? And also then change the menu settings as well. Each menu setting with 700Hz should be changed to the new center frequency.? 73 Hans G0UPL On Fri, Dec 8, 2017 at 9:21 AM, Andy V. Borisenko via Groups.Io <rw9rn@...> wrote: Hi all! |
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