MIEWES @ C-_CZ31M]P05L3LgEE@!!c1 1:>:5r <3:3311E?bd I didn't expect to be able to produce a second News quite so soon after the first one but I received a long letter from Bill de Carle on Monday with news of the beacon. This should now be on the air and details follow later. Publicity :::: George Dobbs included a whole column in his QRP section in the October RadCom about CCW so I as hoping for a few sore recruits in the near future. Thanks again. George. New members :::: Welcome to the following. DF3CT Bernhard Raab HB9DDO Stephan Walder VE3DPB Bert de Kat 8000 Munchen 50 Dangelstrasse 9 1697 Upper Wellington Street Grandauerstr. 21 CH-8038 Zurich Hamilton West Germany Switzerland ant. L9B IN Canada ZFlHJJack Hollingworth P.B. Box 1215 Grand Cayman British West Indies Address correction :::: 9i 1 1 de Car I e has asked me to de I et e the Box number f rom hi ss address, at I east for the time being. VENPB beacon :::: Bert has now re-act4vated his c.c.w. beacon and, if all has gone well, it should now be on the air. A new keyer built by KNEE has been fitted which svnchronises the transmissions to absolute time. Here are the details from. Bill's letter. Bill de Carle has asked me to delete the Box number from hiss address, at least for the time 1. Frequency is 7/0173 KHz to within A.' Hz checked reoullarly aqainst Lor-an C. charged but it is suggested that. if opera is to be or.. ",litO KHz, it is not a good idea to have a beacon on the same frequency. 2 The R.F. power out will be just under one watt. Antenna will be -vertical ground plane, conidirectional. 4.The keyino rate is the old CCW standard !CO milliseconds ner dot. A+ 'tie becinnino of each transmission a 210-s2cond sync cattern consisting Of 100 dots (with the standard 100 msec. spare after each dot) will be sent. At the beginning of the list second there is an ID which reads ' de VE7jDPB' - followed by a short descriptive sessage indicating that the transmission is from a CCW beacon, giving the power and the location of the beacon. 6. The entire sessaue including the sync pattern) takes 73.4 seconds to transmit after which the beacon will be silent until *he next transmission. 7. -cur every five minutes exactly svnchronisEd to coordinated universal time. The rising edge of the Transmissions oc first dot in the svnc pattern will coincide with universal time seconds = 00, and minutes = every multiple Of five. E.g. a transmission will begin at midnight GMT then the next transmission will start at 0005, then 0010, etc. This way you will know precisely when the sync pattern is being transmitted. All you need is a good clock or a receiver tuned to a standard time signal. Once the beacon is s-nchronised it should stay within +/- one second of absolute time for months. Bert will check it week!y against WWY and re-sync it if it drifts sore than one second either way. VE30BE has a good path and will monitor the transmissions. S.The beacon wi I 1 be on the air 24 hours a day and 71 days a week If necessary the frEcuency could be Receiving the beacon :::: Don't forget that, although the purpose of the beacon is to be able to check your c.c.m. decoder, it can be received as a normal c.w. signal so please have a listen and report either direct to VE3DPB or through se. In the old days the self-same beacon was received all over the planet by VE3FXT who travelled around taking with him a Petit filter. When you have a c.c.w. filter working the fun is to see how long you can continue to --- copy the beacon after it has QSB'd down below the noise'. Don't forget that, although the purpose of the beacon is to be able to check your c.c.m. Experimental audio synthesiser ::i: Please note that there is a small error in the text - the synthesiser output covers 2600-3400 Hz in I Hz steps giving increments or decretents of filter frequency in steps of 0.25 Hz. The same error was repeated in News Issue I. R.F, synthesiser :::: now decided that it would be better to Although I have made some progress with this I have concentrate on getting an the air and return to the niceties later so I have deleted information sheet 12 for the time being and substituted a new one relating to the VEMBE keyboard, VE30BE keyboard :::: Bert has received a letter from Bill de Carle giving a few more notes on the keyboard. I as sure that neither will raise objections if this is passed on so if anyone would like a copy please let se know. W6NEY articles in GET -:-: W6 - ar ic es in - Bert has drawn my attention to two errors on fig. 7 page 19 of OST for June 1981. obviously be MPFI02. 96 emitter should go to 12 volts as the transistor is a PNP tvoe and not NPN as shown. Information, sheets 1'.. Source programs. for the VEMBE c.c.w. keyboard '80-15 asc.emb'v lanouaael. (11 Pages,, 14.Extracting stable clock sionals fret a.m. broadcast carriers for amateur spread-spectrum applications by MICK published in October 1981 GEX. Asimple way to remove modulation from a.m. signals to get jitter free clock pulses. I have used this method successfully to remove the modulation from Draitwich in a frequency standard. Original circuit obviously needs alterations to circuit constants. An oscillator is locked to the carrier and car, be used to produce multiple-, oi Criminal frequency. (5 paces) 93 should The following are extracts fret the 1975 Woodson Newsletters and some have been abbreviated in the GET and C9 articles. Remember that they are 14 Years old and, although they form a good basis from which to start, more modern methods are possible in 1989. 1CWN75:5 15. Frequency standard temperature compensation by Woodson I - (I page) 16.Fundamentals of coherent c.w. by Ray Petit CCWN7/5:7 I QG pages) 17.Coherent Ten-Tec by WA7?VC CCWN7':14 J Original articl; which is referred to in the A.R.R.L. handbook. M pagesi 18.Co, nversion of the HD-10 kever to c.c.w. CCWN75:43 Upage) 19.Portable c.c.w. transmitter by Woodson CCWN75:53 Five transistors, one watt output, crystal controlled. This should form a good basis for a first transmitter and is a somewhat simplified version of the one described in the OST articles. (11 pages) 20.Stabilisation of the SB-303 receiver for c.c.w. by Woodson CCWN75:60 Original article which was abridged in @ST for June 1981. (4 pages) 21.Synthesiser for 5.0 to 5.5; MHz by Ray Petit CCWN76.65 There are doubts about the accuracy of the circuit as two versions are available both of which are included. (4 pages) 22.Synthesised local oscillator system for receivers and transmitters by Petit CCWN,16:93 Phase-locked 9 MHz b.f.o. and h.f. oscillator covering IKHz (10 Hz spacing). My copy is poor quality but I hope to U'-e abie to check and re-draw it sometime - unless anyone else iouid like to try (6 pages) Photocooies are five pence per page - stamps acceptable for small amounts. I as quite prepared to send a reasonable number of photocopies free of charge to interested overseas members who have difficulty in sending small amounts of cash. News from members :::: 67% John has nearly got his old filter working and is starting on the VE30BE standard and a 5 MHz synthesiser. G-JIRM.:At the moment I at thinking of getting something simple going as a receivcrIltransmitter possibly based an the Woodson desin but u5ino direct conversion. I have now completed a 15 wait linear amplifier for use with the transmitter when built. 64SYC: Geoff tells me he is &_@kino a start an the keyboard - his wife (GOK.70, thinks he then may be able to send somethin- other than incoherent c.w. I VE30BE:Bi II ha 5 also sent i onEd ar, interest in FSK and wi 1 1 see if Dannv G--X'Y'R who J -_ a I so interested wou Id I ike to try some experiments. Apart from the news about the beacon he has also sent some interesting notes on c.c.w. in general Zzinly -I +in+@,a -Mzg. ------ - thin@ we a!! -_21is-z-, th-at gre-141- care h@_=_ to be taken to avoid interference of this t-oe but the point is well worth mentioning acan, He uses a TS4310-S so if any of You have one of thecz and don't mind digging inside Bill may be persuaded to let us have some notes on the conversion. My own attitude is to leave such things well alone and build for c.c.w. from scratch but I know there are brave souls who may be prepared to have a go. Specifications for the Petit filter :::: Included in the original Woodson Newsletters I have are the full specifications of the and alioneent instructions. I have not had an opportunity to check and see how much of this applies to the more reCent Woodson -version in 9ST. If anyone has built a Woodson filter and would like to have a go at checking the oricinazl specification please let me know. Test equipment required is listed as oscilloscope. voltmeter, frequency counter, audio ampli-fier ' 'speaker, synthesised audio Generator and 1 MHz standard. Any amendments necessary can then be included for everyone. Report-, of activity :::: As it appears that one or two members are getting to the stage where it may soon be possible to get some C.C.w. activity Ray I ask you all to kee ' p se informed of -your proaress se that I can put you in touch with one another to arranae tests. At the moment Bert G-jRHI and I are working towards this end and it is hoped that others say be able to fore similar partnerships before we go on to the stage where regular activity times can be arranged. S-2eter -::: I said I would not i nc I ude ci rcui t di aar ass in the News but there J 5 a useiu I I i ttl e di agr am in CCWN75: 21 which is worth passing on. Final note :::: I am distributing copies of News free to all genuinely interested but ask you to let me know if you har no further interest in order to reduce the cost. Photocopying costs money.and so does postage but I do not intend td-@ ask for subscriptions as this Will only sake matters more complicated. However, the add few postage stamps with any letter you may write to se would be welcome. Contributions are not requested from overseas members due to the di-iiculty in sending small accunts and overseas postage stamps (althouch useful to the XYL's collection) are no use for postaoes an the News. 73 de 63IRM