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Slim Jim Antenna was designed by late Fred Judd. It uses a matching system similar to j-pole antenna. It is the most effective antenna when compared to other ground plane antennas. It has two electric poles charged positive and negative. Use this online slim jim antenna design calculator to find the actual wavelength, overall length, half wave radiator section, quarter wave radiation section, feed point, gap and spacing of Slim Jim antenna by providing the frequency and velocity factor. slim jim antenna design calculator Actual Wavelength = 300 / f Wavelength Considering Velocity Factor = 300 * v / f Overall Length = 22500 * v / f Half Wave Radiator Section = 30000 * (0.5 * v) / f Quarter Wave Matching Section = 30000 * (0.25 * v) /f 50Ω Feed Point = 30000 * (0.025 * v) / f Gap = 300 / f Spacing = 30000 * 0.02175 / f Where, v = Velocity Factor f = Frequency Example If the frequency and velocity factor is 30 MHz and 10 vf, then Actual Wavelength = 300 / 30 Actual Wavelength = 10 m Wavelength Considering Velocity Factor = (300x10) / 30 WCVF = 100 m Overall Length = 22500 x 10 / 30 OL = 7510 cm Half Wave Radiator Section = 30000 * (0.5 * 10) / 30 HWRS = 5000 cm Quarter Wave Matching Section = 30000 * (0.25 * v) / f QWMS = 2500 cm 50Ω Feed Point = 30000 * (0.025 * 10) / 30 50Ω FP = 250 cm Gap = 300 / 30 Gap = 10 cm Spacing = 30000 * 0.02175 / 30 Spacing = 21.75 cm Hope that is of help.. Craig vk3ncr

Hello, Mani has supplied the club with files appropriate for our Foundation Course. These files have been added to the "Foundation License" page. Click Here They are also available for download from our clubs "Famparc Files & Radio Manuals" page. Click Here These are for all and especially if you are planning to sit for your Foundation License.

Don’t put this 7300 on the ground you may never find it.. I want one 🤣🤣

ACMA: We are consulting on operational arrangements to support the proposed amateur class licence. We are also consulting on our proposal for a staged implementation of higher power authorisation. ACMA: Outcome We received 58 submissions to the consultation. You can access the submissions that were not sent on a confidential basis below. As outlined in our 29 March 2023 amateur radio update, we are considering how to best deliver arrangements under the class licence. This means the class licence will not commence on 1 July 2023 as previously indicated. We will provide an update on the commencement date for the class licence, as well as next steps for qualification and call sign services, later in 2023.

"Parks On The Air" POTA have added many many new Parks to the already large list of Parks in Australia. On checking, I see many new Parks that are now able to be activated around the Frankston and Mornington Peninsula. This is great news if you like to play radio in a park and again some POTA points too. GO AND PLAY RADIO.

Special Event Callsigns Issued Date : 13 / 04 / 2023 Author : Lee Moyle - VK3GK VI2023HRH In celebration of the coronation of His Majesty King Charles III on the 6th of May 2023 Event duration May 1st until May 31st 2023

Hi members, The Antennapalooza weekend is moving ahead.. Friday and the weather is perfect.. Hoping to see many of you down here for this top event. Cheers Craig VK3NCR Update Saturday Morning Update Sunday Morning... Brrrrr

Vertical dipole for 20m (T2LT style). It’s a great antenna, and the satisfaction you get from using something you made yourself is great. So if you fancy having a go at making one, your need approximately 17m of RG58, a 68mm diameter drain pipe for the air choke former. The length of the exposed dielectric is 5.1m plus 30cm for tuning (5.4m total), then 5.1m of untouched coax to the air choke, which is 24 turns of the coax around the 68mm drain pipe. It’s just over 10 metres in length when made, so you will need something like a 12m spider-beam mast to mount it on. SWR figures I get are 1:5:1 across the entire 20m band. Thanks to : https://g8amc.co.uk/20m-t2lt-by-stuart-m0ovg/

ORARC 2023 Field Day 10 & 11 June Kings Birthday Weekend. Don’t forget to mark your calendars for Saturday and Sunday the 10th and 11th of June for the ORARC 47th Annual Field Day over the 2023 Kings Birthday Weekend. The venue for the 2023 Field Day is the Wauchope Showground hall in High Street, Wauchope. This hall is an excellent venue and will support all the usual Field Day activities. The Field Day has been held in the Wauchope Showground for the last few years and both locals and visitors were very pleased with the venue. There is plenty of on-site parking and the area is safe for the fox hunts.

With our club gaining some new members of late, and that most of them will be entering in to the new and exciting world of Amateur Radio for the first time, it can be very daunting in trying to select a new radio.. I am keen to get our members ideas and thoughts on what would be a good transceiver for our newb's. I have tried to pick Mobile or Semi Portable Transceiver with at least Dual Band, and also Base Station / Mobile HF. Prices vary between these radios.. Simply click on your selection, and it will be counted. Have fun.. Check back to watch the results unfold.

As many Famparc members know, we had our End Fed Half Wave UNUN Transformer kit project last year. It was very well taken up by members and non members.. A few members have asked about the 80M Coil, so the EFH can be operated on the 80M band. Speaking to Richard the other day, he is happy to produce a Built Kit with all parts and build sheet. Would you like to build this kit?? (Image is a representation only) Cheers. Craig vk3ncr

SOUTH COAST AMATEUR RADIO CLUB ANNUAL BUY & SELL SUNDAY 23rd April 2023 Seaford Meadows Scout Hall Railway Ave Seaford Meadows SA