KK3Q (ex-KD4KU & WD4HSA)
EPC #786 | CDG #131 | NDG#120
30 Meter Digital Group #0198
SRT #259 | DMClub #689
ARLHS #1366 | 10-10 #26039
Feld Hell #FH 733 | 070 #581


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DX Code of Conduct

I will listen, and listen, and then listen again before calling.

I will only call if I can copy the DX station properly.

I will not trust the DX cluster and will be sure of the DX station's call sign before calling.

I will not interfere with the DX station nor anyone calling and will never tune up on the DX frequency or in the QSX slot.

I will wait for the DX station to end a contact before I call.

I will always send my full call sign.

I will call and then listen for a reasonable interval. I will not call continuously.

I will not transmit when the DX operator calls another call sign, not mine.

I will not transmit when the DX operator queries a call sign not like mine.

I will not transmit when the DX station requests geographic areas other than mine.

When the DX operator calls me, I will not repeat my call sign unless I think he has copied it incorrectly.

I will be thankful if and when I do make a contact.

I will respect my fellow hams and conduct myself so as to earn their respect.

For a detailed discussion of each point, click here.

 

QPSK31 versus BPSK31

In response to a posting I made concerning why people seem to be "stuck" on BPSK31, W6IDS sent me this great information that really does need to be passed on.

QPSK31 versus BPSK31 on the VK – JA Circuit August 2002

AR March 2000 P36.

By Graeme Harris, VK3BGH.

Peter Martinez G3PLX introduced the PC sound card version of BPSK31 in 1998 and this has now become the most popular digital mode on the HF bands. QPSK31 is the FEC version of BPSK31 but little is seen of this mode even though it demonstrates to be significantly superior to BPSK31. The author found himself discussing this curious situation with a regular sched partner Satoru JA1SCW on several occasions recently and this resulted in the conducting of a series of structured tests over a 3-week period. This test data now provides some perspective to the superiority of QPSK as worked over the JA – VK circuit. The results detailed below show that on 20 Meters, QPSK produces significantly fewer errors relative to BPSK as propagation disturbance (QSB flutter) increases. It has similarly been observed to be more robust than BPSK when QRM is present.

This further illustrates the benefit of QPSK as propagation disturbance increases and also tends to show this to be relatively independent of typical power levels used by DX operators.

QPSK31 has been demonstrated to be clearly superior to BPSK31 over the VK3 - JA DX path under adverse conditions. Casual contacts between VK3 and the USA have also produced similar results in favour of QPSK. There does now appear to be a case for QPSK to become the default PSK mode but this is unlikely to be accepted until the QPSK benefits are more widely recognised by PSK operators.

Recent contact with Peter Martinez G3PLX regarding these tests indicates that he is of the same opinion regarding the superiority of QPSK. Peter advised that he uses QPSK in preference to BPSK whenever in QSO with his regular sched partner. He said he originally made BPSK the default mode because it is easier for beginners to use. This is because BPSK requires half the frequency stability required by QPSK, will work with either LSB or USB modulation and doesn’t have the 800MS QPSK FEC delay between overs. He also believes that most operators when they try QPSK do so under good local conditions and see little or no improvement for their effort and then return permanently to BPSK. Peter indicated he is keen to see data similar to that presented here published to the PSK community so that users are encouraged to try and prove for themselves the real value of QPSK. This is what JA1SCW and the author had in mind at the outset when we undertook these tests. In reality, I have not observed any QPSK frequency stability problems with my 20-year-old TS-430S transceiver or noticed the 800MS FEC delay between overs. What I do notice however is the huge reduction in print error when changing from BPSK to QPSK under adverse conditions. It is now hoped that existing BPSK users might look again at the value of QPSK for DX contacts. For those who have not tried PSK31 or any of the many other soundcard modes there is much information and support available these days within the EMDRC and on the web.

 


 

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