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Re: Receiver module for U3S - multiple bands
Hi Ken.
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Ok thanks, understood. Now to go and get the receiver board etc...If shipping times have improved, that might be my Xmas project 73 Roger --- ** Roger Hill ** On 2017-12-11 19:26, KENS 2ND ACC via Groups.Io wrote:
Sorry, did not answer your specific questions... |
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Re: Receiver module for U3S - multiple bands
Sorry, did not answer your specific questions...
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''Now comes the bit I am unsure of, and that is the Park setting. The receiver notes say use park mode 4 - but that is only one frequency. But the U3S says the setting in the RX screen determines the clock frequency...does that mean I can leave park mode at 2 as it is now, and set the frame to 20 minutes, and hence receive on three frequencies, and still park at 150Mhz as I do now? My firmware is 3.12a." Answer is yes to all, you could do this, but you effectively will be receiving on 150/4 = 37.5mhz during the CAL period. 73 Ken G4APB -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Roger Hill Sent: 11 December 2017 18:38 To: [email protected] Subject: Re: [QRPLabs] Receiver module for U3S - multiple bands Thanks Ken. Since the 'LPF always in series' is the highest frequency, I figured it would not matter if I had it in series with the BPF's..they would all be for bands lower than or equal to the LPF. Roger G3YTN --- ** Roger Hill ** On 2017-12-11 18:18, KENS 2ND ACC via Groups.Io wrote: Hi Roger, |
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Re: Receiver module for U3S - multiple bands
Hi Roger,
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Yes , I could see that working. A bit of extra loss in Rx mode though. 73 Ken G4APB -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Roger Hill Sent: 11 December 2017 18:38 To: [email protected] Subject: Re: [QRPLabs] Receiver module for U3S - multiple bands Thanks Ken. Since the 'LPF always in series' is the highest frequency, I figured it would not matter if I had it in series with the BPF's..they would all be for bands lower than or equal to the LPF. Roger G3YTN --- ** Roger Hill ** On 2017-12-11 18:18, KENS 2ND ACC via Groups.Io wrote: Hi Roger, |
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Re: Receiver module for U3S - multiple bands
Thanks Ken.
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Show quoted text
Since the 'LPF always in series' is the highest frequency, I figured it would not matter if I had it in series with the BPF's..they would all be for bands lower than or equal to the LPF. Roger G3YTN --- ** Roger Hill ** On 2017-12-11 18:18, KENS 2ND ACC via Groups.Io wrote:
Hi Roger, |
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Re: Receiver module for U3S - multiple bands
Hi Roger,
It certainly is addictive, especially if you try to build ‘outside the box’ ideas. I have built a multi band hopping rx and a multi band tx/single band rx transceiver, but your ideas sound interesting. ‘Rx’ mode automatically gives 4xLO freq as displayed as needed by the U3 rx, but if you want to receive during the CAL mode you need to set the PARK freq to 4x the LO freq yourself (ie 7mhz in rx mode needs 28mhz in Park mode.) I generally use Park 4 setting. Remember that the latest relay switched lpf board needs to be specially linked so one lpf is not always in series with all the other filters. Also I am not sure how you will separate the rx bpf inputs from the tx lpfs. I had to use a c/o relay. Hans suggestion of just wiring the two together produced high tx harmonics for me. Your timing logic seems sound but I wanted cal and display of result in a 2 min cycle so I use 01 115. 73 Ken G4apb Sent from my iPad |
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Having fun with T1 on 40M QCX
开云体育After
winding T1 for my 40M QCX, I decided to have a little fun before mounting it,
and perhaps get it right before mouinting it.? I installed some header pins
at unused location C8 (in the 40 meter case) and, referring to photo 7 on page
53 of the manual,? I connected secondary 3 to the header pins via plug-on
wires.? Then I connected my return loss bridge to the primary winding and
injected a frequency scan with my dds-based poor ham’s scalar network analyzer
into the return loss bridge with the 5-turn primary going to the unit under test
port.? This gives a highly sensitive indication of the resonance
frequency.? Note that I did not cut apart any of the windings on T1 at this
point. To make a long story short, the specifed winding count was within the
range of the tuning cap, but I removed one turn from secondary 3 to get the
desired resonance point at close to the midway adjustment of the tuning
cap.? Photos attached. |
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Receiver module for U3S - multiple bands
开云体育Hi all: WSPR is addictive! This is my first post to this group, so please be gentle. I have a U3S, running on 3 bands at present, 20, 30, and 40. I am using the relay board to hold two of the LPF's, and one on the U3S itself. That leaves 3 more LPF slots available on the relay board. So my idea is to use them for 3 more BAND pass filters, and set up the modes in the U3S to TX for the first three, the RX for the ones with the band pass filters in. To do that, I think I need the following setup, and would appreciate comments. 1. Acquire the receiver module and band pass filters. Put the filters into the relay board, and configure the U3S as RX for those bands. 2.Connect the key line on the U3S to the TX line on the receiver module, and the clk1 line to LO. 3. Then??because I will need to feed the incoming RF AFTER it has passed through the Band Pass filter, I will need to pickup the incoming RF at say the output side of C5 (i.e the PA side of the BPF). That will then go to the RF input socket of the receiver module. So the RF flow will look something like this for the three RX bands: Antenna socket --> Relay board RF connector --> BPF--> pick up incoming RF here(perhaps the output side of c5.)--> to U3S PA? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? V? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Receiver RF in 4. The connections for the BPF on th ereciver board will simply be direct connections..no BPF on the receiver board. 5. Adjust the frame parameter on the U3S to say?20 minutes, so there is enough time for the?6 2-minute cycles (3*TX, 3*RX), plus 4 minutes cal. Now comes the bit I am unsure of, and that is the Park setting. The receiver notes say use park mode 4 - but that is only one frequency. But the U3S says the setting in the RX screen determines the clock frequency...does that mean I can leave park mode at 2 as it is now, and set the frame to 20 minutes, and hence receive on?three frequencies, and still park at 150Mhz as I do now?? My firmware is 3.12a. Many thanks Roger G3YTN ---
**
Roger Hill **
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Re: 17 meter QCX output issue.
Steve, the transistor arrived last week, and I had some other things that sucked away my time. I just did replace the transistor a few minutes ago and It's now a solid 3 watts to an antenna. Of course the band is stone dead except for some FT8 activity up the band.?
Thanks so much for the 751. I owe you one.? |
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Re: progrock on power up
To followup, I found the issue with the progrock blinking three times rather than four: a sagging 9V battery I was using for testing. I plugged it into 13.5V from my Astron and it operates as it should. Thanks to Alan and Mike for their input. Best, Chris, VO1CKD ?
On Thursday, December 7, 2017, 2:20:23 PM NST, Chris Dunnett via Groups.Io <chris_dunnett@...> wrote:
Alan, I though of taking a video and slowing it down but...that just takes time away from building more radios. :) I'll check the synth on my home receiver tonight. So long as it works :) Best, Chris.
On Thursday, December 7, 2017, 1:53:41 PM NST, Alan G4ZFQ <alan4alan@...> wrote:
> On power up, does the LED come on first then flash four times? > Perhaps I'm just missing a flash. > Chris, I've never really bothered, I had a counter on it and that confirmed it worked. But I've just tried counting, blowed if I see more than 3 but they are just short flashes. 73 Alan G4ZFQ |
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Re: QCX 20m LPF investigation
Fabrizio Menghini
Hi Bob,
For my qcx20meter I measure with a precision lcr meter every toroids. The L4 for 20 meters on red amidon 10 turn is over the 0.40microH. I found 9 turns is pefect. After initial calibration I measured rhe output power on 14.020 with a scope and a diamon sx600: for 13.8V there is 3 Watt on 50Ohm. The lowpass filter on yellow toroid turns are right on my lcr meter. Hope help you. Best Regards Fabrizio |
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Re: QCX 3D print
Dear Group - added new version of the case to??
This version is to G8MXV's specification and includes more room for the lipo, an on/off switch, battery supports to stop the lipo wandering and no microswitch or DC apertures.? This version has been printed and assembled.? Everything fits!?? Details in zip file on Thingiverse plus photo in main file section. 73, Dave, G8XUL |
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Re: Snap, Crackle, Pop!
I imagine you have tested this with another rig, as I had a similar sound on my 30m QCX when I had a bad connection between feedpoint and doublet dipole. So I imagine you must have eliminated it being something other than the QCX itself. Hopefully someone else listening to the recording may have an idea what could be causing that.
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Re: QCX Troubleshooting - Please can you help?
Can you check and let me know what voltage you are getting at Pins 9 and 10 please? I get no DC voltage at all, and no 20mhz signal either.Julian I've avoided jumping in because I cannot really help. But it seems to me if the display is showing something the 20MHz must be working. I've no idea about voltages but a scope put on the crystal pins will most likely stop oscillation. The way to confirm is with a RX not connected to the device. 73 Alan G4ZFQ |
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Re: QCX modification for 40 Meters
The idea is to use two SPDT toggle switches instead of the rotary encoder and emulating the behaviour, the signals is described here: or here You will get the feel for the pattern you need to make with the switches after some practice (:2017-12-08 14:50 GMT+01:00 Joel Fournol <f6cht@...>:
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Enno Korma, PF5X
Wesley Matthews
Daniel Ekman SA2KNG
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