Club Meeting 2 October 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 2 October 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Dave read out the death notice of Karen Wilson ZL2AQO who was secretary / treasurer of the Napier ARC for many years. A brief silence was observed.

Present: Peter ZL2CD, Revel ZL2SS, Martin ZL2MD, Dave ZL2DW, Blue ZL3TT, Rob ZL2AN, Stu ZL2XC and Karl ZL1TJ.

Apologies: ZL2MO, ZL2HB, ZL2ST and ZL2IT.

Minutes of previous meeting: Read and confirmed to be correct: ZL3TT, ZL2CD.

Arising: Dave 2DW:The Mt Threave repeater co-ordinates were determined and submitted.

Dave 2MQ: our attempt to book the Napier Memorial Conference Centre for the 2021 NZART Conference failed. There is a perpetual booking for the QBD weekend in place.

Correspondence: with Syd Rowe ZL1LWR, Te Puke ARC, regarding proposed linking of their repeater with Rotorua, Taupo and so with our 725 repeater. Also with Warren ZL2AJ who proposes to establish several new repeaters in South Waikato and link these to the local 405 repeater.

A confirmation and offer of assistance with the 2021 conference organisation from NZART Conference Coordinator Topsy Scott ZL2LS.

A newsletter from Icom agent RWS Communications.

Finance: Treasurer’s report attached. The last power account jumped to $131.14. The consequence of the clubroom heater being left on for several days. A cut-out timer is needed.

General Business: A discussion regarding to the two proposals to link Hawke’s Bay repeaters to other networks (see correspondence above) ended with both repeater trustees (2DW and 2MQ) voicing opinions that there is no need for this as the National System does a similar job and works well. A negative response was agreed to by all present. Dave 2DW to respond to Warren 2AJ, Karl to the Te Puke ARC.

The meeting closed at 7:50 pm.

And was followed by our annual quiz, once again devised by quiz master Dave 2MQ. The usual format, 10 general knowledge and 10 technical questions were within the easy to not so easy range.

The winner: new member Martin ZL2MD who did the licensing study recently so should know the tech stuff but has obviously also a great deal of general knowledge.

The sticky buns were fresh and beautiful. Thanks Dave.

Karl ZL1TJ

Club Meeting 4 September 2019

Minutes of the Gen. Meeting of Br 25/NARC, Napier, 4/9/19, 7-30pm

(Min’s taken by David ZL2DW due to Karl ZL1TJ being absent)

Chair: Dave ZL2MQ

Present: Wally ZL2MO, Blue ZL3TT, Michael ZL2MY, Dave ZL2DW, Rob ZL2AN, Martin ZL2MD, Stan ZL2ST, Errol ZL2IT, Revell ZL2SS and Peter ZL2CD.

Apologies: Karl ZL1TJ, Michael ZL2VM, Stu ZL2XC.

Minutes of the previous meeting: Read and confirmed correct: ZL3TT, ZL2MD

Correspondence:

– a reply from Warren ZL2AJ on behalf of NZART Council accepting the offer by Br 25 to host the 2021 NZART Conference and AGM at Napier.

Finance:

– a report from Peter ZL2CD was given re the Br 25 bank balances, he also noted that Kiwi Bank was about to decline cheque deposits and to stop their customers issuing cheques also.

– A White Board was donated to Br 25 by Wally ZL2MO (value $10).

General Business:

– ZL2MD asked about the requirement for the upcoming DMR repeater Lic. at Mt Threave to have a Long. and Lat. as measured at the base of the repeater aerial mast. David ZL2DW explained that it was a request by the licencing ARC (Doug ZL2TAR) and as it was being done for free we would comply, as soon as the info. was obtained during a visit to the site.

– Further to the NZART Conference correspondence above, David ZL2MQ said that the first Conference Committee meeting would be held at the Br 25 Club Rooms at 7-30 pm on 17 Sept.

The Meeting closed at 7-45pm

Guest Speaker

Errol ZL2IT gave a talk on the history and creation of 50 OHM coax cable. This was followed by contributions by those gathered on various subjects……….peppered with much humour.

Club Meeting 7 August 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 7 August 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm. Dave welcomed visitor Martin Akhurst who recently passed the licensing exam and has now been allocate the call sign ZL2MD.

Present: Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, John ZL2AGE, Errol ZL2IT, Martin ZL2MD, Dave ZL2DW, Mike ZL2VM, Wally ZL2MO, Stan ZL2ST and Karl ZL1TJ.

Apologies: ZL2XC, ZL2HB and ZL3TT. (2SS, 2MO)

Minutes of previous meeting: Read and confirmed to be correct: ZL2MY, ZL2CD.

Arising: to be discussed under General Business.

Correspondence: From Dave 2DW: Branch 13 support for the proposed 2021 NZART conference offered. From Warren 2AJ: proposed changes to ‘Ham cram’ format. To New Plymouth conference organiser and Debby at NZART, request for information. received a response from Debby. From Mike 2VM: information from past conferences extracted from Break-In magazines.

Finance: Treasurer’s report attached. The term deposit was rolled over for one year at 3.1%. The bank was convinced to reduce the withholding tax from 33% to 10.5%. Karl to attempt to lodge a tax return asking for a refund of last year’s tax withheld.

General Business: Estimate for shack whiteboard replacement from Wally ($50-$100).

Dave 2DW: Bch 13 is looking into the establishment of a DMR repeater, probably on Mt Threave, possibly becoming part of a new digital National System. A lengthy discussion followed. A licence is being applied for, Napier ARC will be asked to share the various costs as per existing agreements.

Errol asked what is happening with D-Star? Dave 2DW: being a proprietary mode, it is now being overtaken by technological (internet) developments and has only a limited future.

The 2021 NZART Conference and AGM: It was moved by Dave 2MQ and seconded by Karl that the NARC offers to organise and run the event. In favour: seven. Opposed: none. Carried.

Dave 2DW confirmed Branch 13 support, offering to organise speakers for various special interest groups and a raffle. The following agreed to be part of the organising committee: 2MQ, 2IT, 2ST, 2DW, 2VM, 2MO, 2MY, 1TJ, 3TT(2DW). First meeting for allocation of responsibilities etc. scheduled for 17 September. Karl to report to NZART, Warren 2AJ to seek confirmation and approval before proceeding.

The meeting closed at 8:20 pm.

And was followed by the club’s annual ‘Show and Tell’ session:

1) Errol: a fully operational computer with 4GB ram, 64GB SDD memory, Wifi, Blue-tooth, all the ports and a (legal) Windows 10 operating system for Aus $200. Model AP35, on EBay.

2) Dave 2MQ: a well made illuminated magnifying headset. Exchangeable lenses. Essential gear.

3) Dave 2DW: From an October 1978 Break-Out article by Trevor King ZLAKW: A longer wire picks up more electro-magnetic energy than a short one. And: a short aerial converts all the electro-magnetic energy pumped into it. Aerial fundamentals.

4) Mike 2MY: a switch mode computer power supply converted into a 3-5-12 Volt bench supply.

The evening was rounded off by Dave 2MQ’s demonstration (with projector and screen) of a dual SDR receiver unit. The two radios are synchronised but one can be phase shifted. Interesting to connect one to a vertical and the other to a horizontal antenna and compare the outputs.

180 deg. phase shift could be used as a noise blanking device? Unfortunately the bands were ‘dead’, the experiment may be repeated at a future date.

Karl ZL1TJ

Club Meeting 3 July 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 3 July 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Stu ZL2XC, John ZL2AGE, Errol ZL2IT, Peter ZL2LF, Phil ZL2RO, Paul ZL2HB and Karl ZL1TJ.

Apologies: ZL2VM, ZL2US, ZL2DW, ZL2MO.

Minutes of previous meeting: Read and confirmed to be correct: ZL2CD, ZL2MY.

Arising: Karl: contrary to last months announcement, Paul ZL2HB’s club membership stands, he resigned from the committee only.

Blue: due to branch 13’s June meeting being an excursion no business was discussed.

The possibility of branch 13 assisting branch 25 with the proposed 2021 NZART AGM and conference in Napier will be discussed at the July meeting.

Dave: the boxes for the club project, dummy load extraordinary, have been delayed somewhat. The Arduino software will ensure a level response over a wide range of frequencies.

Correspondence: inquiry from Doug Birt ZL1BFS regarding the status of our submission to the Napier City Council and a reply to this.

An invitation from the Inland Revenue Department to participate in a ‘satisfaction’ type questionnaire for non-profit organisations and a ‘no thank you, we are actually not a charitable organisation’ response in return.

Notice from John ZL2VAF regarding the visit from and meeting with new AREC director Don Robertson ZL2TYR. This was forwarded to members.

Outwards: a thank you note to Don for his presentation at the June 23 special AREC meeting.

Finance: Treasurer’s report attached. Monthly power account paid.

General Business: a reminder from Blue about the branch 13 junk sale on the 24th.

A note from Dave 2DW saying thanks to branch 25 members for participating in the Faraday Centre excursion.

Peter 2LF mentioned the amazing WW2 prison camp improvised (bits of string and no.8 wire) radio receiver constructed to keep prisoners in touch with the BBC. Article to be posted in Break-Out.

Dave 2MQ: now available: very cheap motors, (Arduino) controller and software to build a satellite tracking station. Could also be used for moon bounce or just locking a telescope onto a far away galaxy or star.

The meeting closed at 8 pm.

And was followed by Stu ZL2XC explaining what he does for a living. While serving an apprenticeship with Rothmans Stu specialized in industrial automation and went through all the stages of relay logic, hard-wired (but solid state) electronic logic, fixed programmed logic and finally flexible, programmable systems. Programmable Logic Controllers (PLC’s) are programmed using ‘ladder’ diagrams which simplify the coding to a graphic (pictural) representation not a great deal different from the actual wiring diagram. This makes program writing (and modifying existing programs) a task that can be mastered by non computer software experts.

Stu is now self employed and can often be found in far away tropical paradises such as PNG where he installs and maintains all kinds of electronic control systems. Stu’s spirited presentation ended with a small PLC being programmed to run a ‘fastest draw’ game. Revell was the winner.

Great presentation.

Karl ZL1TJ

Club Meeting 6 June 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 5 June 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Wally ZL2MO, John ZL2AGE, Errol ZL2IT, Dave ZL2DW, Jaidyn ZL4WW, Peter ZL2LF, Fergus ZL2VF and Karl ZL1TJ. Apologies: ZL2VM, ZL2US, ZL2XC.

Minutes of previous meeting: Read and confirmed to be correct: ZL2MO, ZL2SS.

Arising: Wally: the HF dipole was in fact re-instated by Blue and himself.

Correspondence: Received: a response from Korin ZL2PGJ.

Outwards: Call-book information to NZART, also the outcome of remit voting, response to Kiwi Bank foreign financial ties questionnaire.

Finance: Treasurer’s report attached. Donation of $200 to 4WW and 4YL travel fund paid.

General Business: The club was approached by Warren ZL2AJ about the possibility of it organising the 2021 NZART AGM and annual conference. The initial response was cautious, the workload would need to be shared by a number of members. Does Napier have a suitable venue, ideally combined with accommodation and restaurant facilities? Dave 2DW tabled numbers, costs etc. from his attendance of this year’s conference in New Plymouth. Blue suggested a joint Branches approach. Dave 2MQ asked for a show of hands of those willing to be involved, and at 6 or 7 there appears to be sufficient interest. Dave 2DW suggested a more ‘minimalist’ approach.

Blue and Dave to gauge interest at the HBARC.

Dave 2DW: the annual combined branches (buffet) dinner, now held midyear (solstice) will be at the Napier RSA, June 28. Bookings required with himself or the undersigned. The Branch 13 annual junk auction and scrap metal collection will be July 24.

Peter 2LF has the equipment to rescue ageing VHS tapes to digital storage and will do so for club members for a nominal fee. Peter also suggested that the club investigates Internet access to facilitate any-time access to Web Radio.

Karl reported the resignation from club membership by Paul ZL2HB.

Blue reminded all to follow protocol, in particular pause and listen when using IRLP systems.

Errol suggested the club looks into the possibility of starting an electronics hobby club, either as a subsection to the radio club or as a stand alone, just using the clubrooms, with club members being available for assistance and tuition. Such a club may attract younger people who then possibly might eventually become interested in amateur radio.

A discussion followed, gauging interest and considering potential problems such as the need for parent supervision when mentoring young people. Publicizing etc. was discussed. To be given further consideration at committee level.

Dave 2DW then briefly reported procedures and outcomes from the NZART AGM etc.. Remit one lost, remit two passed, new President and Vice-President. Dave’s talk went well with substantial attendance. Would he attend Conference again? Answer: Yes.

The meeting closed at 8:25 pm. And was followed by Dave 2MQ explaining the circuit diagram and Arduino programming of the ‘up market’ version of this year’s club project, a 100W dummy load with built-in Watt meter. An excellent presentation with diagrams etc. projected on the screen.

Karl ZL1TJ Secretary NARC.

Club Meeting 1 May 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 1 May 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Rob ZL2AN, Wally ZL2MO, John ZL2AGE, Paul ZL2HB, Mike ZL2VM, Errol ZL2IT and Karl ZL1TJ.

Apologies: ZL2DW, ZL2US, ZL2XC, (accepted 2MO, 2HB)

Minutes of previous meeting: Read and confirmed to be correct: ZL2MQ, ZL2MY.

Arising: Wally: the 40/80m dipole antenna has now been re-instated and is fully operational.

Thank you Wally and Blue for a job well done from Dave 2MQ.

Blue: Branch 13 has donated $200 to the Jaidyn ZL4WW and Xenia ZL4YL Bulgaria travel fund.

Dave: Can the Napier ARC match this? Moved by Wally and Paul that the Napier ARC donates $200 to this worthy cause. Passed unanimously.

Correspondence: Received: NZART membership list and request for Call Book information.

Information regarding the IARU International Youth Camp in Bulgaria from ZL4WW and ZL4YL.

Jock White Field-day 2017 (2nd place) and 2018 (1st place) certificates from Stuart Watchman.

Foreign Account Tax Compliance Act form from Kiwi Bank.

Info from Holger 2IO regarding German antenna analyzer which was forwarded to members.

Sent: a thank you to Korin ZL2PGJ for his contribution and donation.

Finance: Treasurer’s report attached. Few minor transactions only.

General Business: Wally: the multi band vertical antenna is on a slant and needs refurbishing.

A Saturday or Sunday volunteers effort was suggested. Wally to organize.

Blue: John Newson forwarded a message regarding John Bolton’s display of ancient broadcast radios. To be found at 16 Byron st, till May 9th. Admission free.

Mike 2MY: do all members get a set of keys to the clubrooms? Response from Dave: committee members only but members will be given access on request.

Dave 2MQ presented two prototype versions of the Dummy Load project, the basic one with a smaller enclosure and the power meter version with a larger box. It was decided to use the larger version for both types. Estimated cost sofar is $50 and $75, to be confirmed. Karl to seek firm orders once prices are decided on.

Remits. There were two remits to consider, details can be found in the March/April 2019 Break In magazine. Of the 7 eligible members present 5 voted against Remit one with two abstentions.

Remit 2 received 7 votes in favour, zero against. Results to be forwarded to Debby at NZART HQ.

The meeting closed at 8:15 pm.

And was followed by the showing of several Ham Radio videos with a reasonably recent flavor e.g. while the sun is not much into ionizing our layers there are still many radio modes that are both fun and rewarding. And how to erect an aerial mast using a helicopter…

Karl ZL1TJ Secretary NARC.

Club Meeting 3 April 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 3 April 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Dave ZL2DW, Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Peter ZL2LF, Rob ZL2AN, Wally ZL2MO, John ZL2AGE, Peter ZL2HM, Stan ZL2ST, Holger ZL2IO, Stu ZL2XC, Karl ZL1TJ and visitors Ian and Dianne Jackson VK3BUF and VK3JDI. from the Gippsland Gate Radio and Electronics Club.

Apologies: ZL2VM, ZL2US, ZL2IT and ZL2HB (accepted 2CD, 3MY)

Dave 2MQ welcomed Ian and Dianne who are on a one week tour of the North Island.

Minutes of previous meeting: Read and confirmed to be correct: ZL3TT, ZL2CD.

Arising: Peter 2LF has a spare hockey stick type aerial mast if needed. Wally: the job is underway.

Dave 2DW: the Taupo ‘meet our neighbours’ trip was a success.

Correspondence: Emails from and to Ian and Dianne Jackson, emails from and to Laurie 2TC regarding correction to previous minutes, email regarding conference registration from Branch 27, forwarded to members, correspondence with Holger 2IO regarding tech talk, copy of the Branch 13 versus Hastings District Council planning outcome from Dave 2DW, email to the Napier CC with this document attached to be part of our initial submission.

Finance: Treasurer’s report attached. Wally presented his account for hardware bought for aerial installation. Payment moved (2MO. 2MY), passed.

General Business: Dave 2DW, from the last Branch 13 meeting: The traditional Christmas social dinner will now be held mid year, probably the end of June. The annual Branch13 junc sale will be held July 24. The 725 IRLP node has been relocated and is up and running again. Xenia 4YL and her youth team operated the ZM4T station to take part in the WPX SSB contest last weekend.

Branch 13 has a number of rechargeable batteries and other gear for sale. Contact David.

New members: Steve ZL2SPF and Brendan ZL2SB.

The meeting closed at 7:45 pm.

And was followed by Holger ZL2IO with a presentation on Station Automation and options and the availability of components and kitsets to construct the necessary equipment.

Holger’s discourse, complete with slideshow and internet browsing option, was of a high standard, with references, web links and source information. Printed copies for future reference were made available, one of which can be borrowed from the undersigned.

Holger also made a plea on behalf of a member of the above mentioned ZM4T youth team, Jaidyn ZL4WW.    Jaidyn is a 15 year old Karamu High School student who is interested in attending the forthcoming IARU Region 1 International Youth Camp to be held in August in Bulgaria.

All accommodation etc. costs are borne by IARU. However, Jayden needs funding for air travel. Jaidyn has engineering skills, he is seeking financial support / paying jobs (any) to earn his trip.

Contact the undersigned or Holger ZL2IO.

Karl ZL1TJ Secretary NARC.

Meeting 6 March 2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 6 March 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Dave ZL2DW, Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Errol ZL2IT, Jan ZL2CZE, Rob ZL2US, Peter ZL2LF, Rob ZL2AN, Wally ZL2MO, John Mouritsen VK2CRI and Karl ZL1TJ.

Apologies: ZL2VM, ZL2XC and ZL2HB (accepted 2MY, 2MO)

Minutes of previous meeting: Read and confirmed to be correct: ZL3TT, ZL2CD.

Arising: Dave 2DW: the Kahuranaki trip was an undivided success. Also, did we get a reply from the Napier City Council? Karl: No. Dave 2MQ asked if a copy of the Branch 13 / Hastings District Council planning documentation is available. Dave 2DW to check.

Correspondence: Email from and to Dave 2DW regarding payment to Laurie ZL2TC.

Email from New Plymouth Conference organizers, passed onto members.

Mail from Gary ZL2IFB regarding doing a presentation, is too busy at present.

Email from Mike 2VM regarding use of the clubrooms for a CDEM meeting on February 12th. Copy of the NZART public liability Insurance certificate from Dave 2DW.

Finance: Treasurer’s report attached. Few transactions only.

General Business:Laurie ZL2TC donated a newer Tait repeater for the National System. The $50 cost of a new DTMF controller for this is to be shared by Branches 13 and 25. Moved by Dave 2DW, seconded by Wally 2MO that payment be made. Passed.

With thanks for his ongoing support to past President and life member Laurie ZL2TC.

Dave 2DW: the Taupo ‘Meet our neighbours’ trip on March 16th is still ‘on’. Meet hams from Taupo, Taumarunui, Rotorua etc., seats may be available. Booking essential.

Dave 2MQ: the Club project. Initial costing for a basic 100 Watt dummyload is $50. The design could be modified for a higher power rating and / or power display. A show of hands indicated sufficient interest to plan for a ‘run’ of 15. Dave may do a short write up for Break-In magazine.

The Menz Shed committee has given permission to terminate one end of our 80/40m dipole on their building. A short hockey stick type mast was provided for this. Alternatively Wally may be willing to part (for a reasonable fee) with a 7m tall boat mast languishing in his back yard. The project is in the capable hands of Blue 3TT and Wally 2MO.

The meeting closed at 8 pm.

And was followed by Jan ZL2CZE presenting the history (1984), development and present state of software defined radio. Limitations and applications (aircraft tracking, signals from the Universe).

Discussed were Rob 2AN’s Icom IC 7610 and the Lynrad software (Dave 2MQ).

Also Kiwi SDR and the proposal to install a remote receiver at Cliffton, a project of Branch 13.

Karl ZL1TJ Secretary NARC.

Club Meeting 6.2.2019

MINUTES OF THE NAPIER AMATEUR RADIO CLUB

Meeting on Wednesday 6 February 2019 at the Clubrooms 123 Latham Street

Chair: Dave ZL2MQ, the meeting started at 7:30 pm.

Present: Dave ZL2DW, Blue ZL3TT, Mike ZL2MY, Peter ZL2CD, Revel ZL2SS, Errol ZL2IT, Laurie ZL2TC, Stu ZL2XC, Paul ZL2HB, Peter ZL2HM and Karl ZL1TJ.

Apologies: ZL2VM.

Minutes of previous meeting: Read and confirmed to be correct: ZL2SS, ZL2CD.

Arising: Dave 2DW confirmed dates for the Kahuranaki and Taupo excursions. Kahuranaki participants must be NZART members. Booking is required.

Correspondence: A number of email exchanges initiated by Mike ZL2VM with Douglas Birt ZL1BFS, NZART local government liaison officer, regarding the forthcoming Napier plan revision.

A preliminary submission to Napier city Council requesting consideration for amateur radio needs.

Email exchange with Charities Services of Internal Affairs withdrawing our application for charitable status.

Finance: Treasurer’s report attached. Power account paid. All subs have now been paid.

General Business: Dave 2DW reported Branch 13’s efforts and success with the Hastings Council’s last planning update. The Council preferred a negotiated outcome over a costly court battle. Dave suggested NARC submits the documentation of this outcome to the Napier CC.

Laurie ZL2TC briefly went over some of NARC’s previous efforts and outcomes.

The club project: Suggested were 1) a horizontally polarized (halo) 2m/70cm aerial, 2) a simple radio / computer interface for digital modes, 3) a dummy load with or without power meter, 4) an active receive only antenna.

After some discussion the dummy load won. Dave 2MQ to do some research and report back.

Laurie 2TC reported that the Wanganui ARS (Branch 48) is installing a broadband aerial, SDR receiver and associated gear to provide an online service similar to the Northland one. To go live early 2020.

The meeting closed at 8:10 pm

And was followed by Errol ZL2IT’s presentation of part two of the 475 KHz story: Transmitters “class E design,build and test”, antenna tuner requirements and antennas for 475 kHz.

Errol’s investigation and experimentation resulted in a ‘home-brew’ functional 630m transmitter and antenna putting out 15 Watts. The single transistor class E amplifier is switched on and off by a square wave output oscillator. Close to a sine wave is produced through filtering. Errol used WSPR mode for contacts made so-far, some with VK land. Class E transmitters can be used for CW, AM, FM and most digital modes. Antenna construction: a base loaded vertical with bucket sized adjustable coil.

Errol ended his excellent slideshow presentation with an invitation to all interested in 475 KHz experimentation to visit his QTH for a chat and a cup of tea.

Karl ZL1TJ Secretary NARC.