Hi,

His diagrams point to the low pass filters. Those are so very common they need not be included - merely mentioned. He mentions them:)

73,

Bill KU8H

--
bark less - wag more

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I also see this as a party not a contest. So I was more interested in how many QCX have been worked by a station than the score. If you want a score, than couldn't it be? that participants give RST plus serial Nr. and QCX give RST QCX and are counted 3 points. Multipliers by DXCC countries.

Martin
DK3UW

Will check :? The Issue appears to be from scores entered into 3830 manually and not understanding how it compiles total.? It would be helpful to determine how the scores were compiled/entered for the ones that appear to be incorrect.

I was lucky. There was an extension computing center in the basement of my dorm at Case (not CWRU then) in '67 with keypunches, and a window with a reader and a printer maned by a bored student. I could pad down there in my jammies at 2 a.m. to do my homework. As I recall I was an expert at duplicating a punched card just past the character I was trying to correct.
Then:
Hand soldered a mole of connections to build a Digital Group Z80 (bus but not S100) with 2K memory and computer controlled cassette tape drives. Programmed Z80 assembler
Commodore 64.? Programmed basic and 6502 assembler
Commodore Amiga: bitmapped graphics, multiwindow multitasking UNIX like OS. Programmed Fortran and FORTH, wrote a programming column for AMIGA Project magazine. The AMIGA had a modern file system, visual editor, symbolic debugger and optimizer for FORTRAN. At work I had an IBM dumb tube and a user hostile programming environment (JCL, no tools).? I wrote a transient coupled heat transfer and chemical reaction FEA code for process optimization at home and convected it to work. With the help of a plant db expert the optimizer was hidden under a simple interface for cure press operators. First deployed in '86, it's still in use in plants.
After that I convinced management to acquire some SUN workstations. That's when I started getting Jack's books that are still on my bookshelf and recently used.

I agree some of the scores seem unlikely and there have been a few comments about the system being too complicated (for those not used to contest scoring) and how theoretically if you work 100 stations but none of them is a QCX then you score 100 X 0 = 0 points!? Its mainly a fun activity to get people on the air so the scoring is secondary and is still sorting itself out.

We are planning to try simplifying it for April's party (Monday 29th April) so it will be 1 point for a non-qcx QSO and 3 points for a qcx QSO, no extra multipliers.? See how that goes.? Is it possible/easy to get N1MM to do that?

73
Peter GM0EUL
? ??

It certainly appears that some scores are not correct.? If you are using the N1MM+ custom template I provided above, ( Mar 26) you need to leave the last col QCX) blank if the other station was NOT a QCX station.? Unfortunately the software dose not distinguish entries, only blank and non blank entries.??

I looked at the scores on 3860 and to me it looks that something is not ok with the mulitpliers K0PD 32 QSOs and 32 Multipliers wouldn't that mean he ahd QSO's with 32 QCX users ?

Also some others if the multipliers are the QCX users there must have been? a lot of QCXes on the air.

Next try 29.04. right ?

Martin
DK3UW

I made an RD06HHF external amp, for my QRP Labs rigs and for general use.



I have one of my QRP Labs rigs set for about 200mw output, and pass it via a 3db attenuator.

I prefer to use an attenuator because it keeps the impedance constant at 50R regardless of frequency (RD06HHF is about 200R).

- Andy -

Hi Michael,
Thanks for your post on this.

I understand how to replace the standard transistors with the Mitsubishi device. But how did you configure the extra bias pot? Did you simple replace this, or did you place a second pot in series or something like that? How did you avoid over driving the transistor by accident?

Thank you in advance for you advice and comments.

I recently had a QCX to look at and T1 had already been removed to rewind and wasnt likely to survive another
removal/ replacement sequence ( well the pcb wasnt going to survive)
So although you cab measure the inputs to IC4 against ground this doesnt give any phase information.
A better way would be to measure the differential signal going into IC4, thus giving some confidence that the phasing in T1
was correct.?
My 1980 edition of SSD for the radio amateur had the answer on page 154. A balun would do the job, balanced to unbalanced and?
so the signal could be measured against ground using this sortabalun.
The result in this case was an excellent signal measure across pins 7 and 9 of IC4, some 30 dB below injected signal but obviously at different
impedances. This measure gave enough confidence to go and find the problem elsewhere in the QCX.
Hope this is of some use. I used 8 bifiliar turns 34swg on a BN43-2402 core and isolation via two 470 pf ceramic caps, see photo
cheers
Geoff
GI0GDP

While the upper hf bands are not particularly stellar, I'm using the QCX-17, largely, on the 30m band.
Just worked Marty, K1FQL in Florida on 10101.7 kHz, while running 4 watts from the QCX-17, with appropriate output filtering, to the downspout antenna.
Sometimes, I choose an operating frequency which hints at the rig I'm using, hence a freq ending in 1.7 such as in this case :0)
So that I may move around the bands quickly & easily, I have the following freqs programmed into the QCX-17's Frequency Presets:
10000.8 kHz WWV & WWVH
10101.7 kHz
14001.7 kHz
15000.8 kHz WWV & WWVH
18069.7 kHz ( also 1.7 kHz inside the lower band edge )
20000.8 kHz WWV only
21001.7 kHz
Notice the 800 Hz offsets in the WWV / WWVH freqs to allow for my CW sidetone/offset freq of 800 Hz.

QCX-series rigs are so versatile !

72 / 73,
Bill, N4QA

If you have access to a 3D printer, you can try to make this small and lightweight key and see if you like it.
The design can be downloaded from Thingiverse here:?

(And if you don't have a 3D printer, it is probably time to get one, if you are in this group, I would say :-)

Torbjorn, LA4ZCA

I have started to do some more precise frequency measurements using the Progrock and the QLG1 with "inverted logic" PPS output, with a 1kilohm resistor in the PPS line between the two boards (at the Progrock end, after about 2 m of shielded cable.).

My initial impression is that it is almost working, but not quite.

Test 1:

I asked a local station using an Elecraft K3 and internal 2 m transverter, both locked to GPS (using a Rohde and Schwartz GPS 10 MHz reference) to transmit on 144.175100 MHz, with the dial set to 144.174000 and WSJT-X generating an 1100 Hz tone.? I received him on? my receiver in USB mode (not GPS locked, so drifting a bit), along with the output from the Progrock/QLG1 combination, set to 144.175000 MHz.? Instead of a 100 Hz difference in audio notes from the two sources, the difference was about 120-140 Hz (as well as I could determine using the waterfall in WSJT-X, given slight drift in the receiver)? Pretty darn close, but not exact.? But then I do not know the accuracy of the Elecraft setup either.

Test 2:

I did a similar test at 15 MHz (receiver set to 14999.000 kHz USB).? WWV was quite strong with very little fading.? The Progrock was set to 5.000000 MHz, so I was hearing it on the 3rd harmonic.? This time I monitored the receiver audio with a sound card spectrum analyzer program (Spectran).? Upon turning on the Progrock and QLG1 the initial frequency was off from WWV's carrier by a bit, then started jumping around, as expected, then approached WWV's frequency from the low side.? But it never got closer than about 3 Hz from WWV's frequency.? After this point was reached the two frequencies started to diverge, ending up 5-8 Hz apart.? Again, quite close, but I am guessing that WWV should not be Doppler-shifted this much with a good propagation path and that the lock algorithm (based on my understanding of various descriptions from Hans) should be capable of better accuracy.

Turning the QLG1 off and on again did not restart the locking process, but turning both the Progrock and the QLG1 did restart it, with more or less the same results each time.? On the last try, after perhaps an hour, the two frequencies had drifted together again somewhat, with about a 2-3 Hz difference again.

It appears to be trying hard to lock, but then giving up before it succeeds, and does not seem to be continuously trying to maintain lock.

I guess I could try inverting the PPS signal, and removing or reducing the 1 kilohm resistor.

Any comments or suggestions?

73,
Steve VE3SMA

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But you managed to avoid TECO.

Does anybody know if Hans' presentation will be captured in any way? I'd love to go to FDIM just can't swing it. I will go to Dayton this year. I know one of Hans' presentations last year was YouTube'd...
--
Dan Reynolds -- KB9JLO
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