---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Thu 04/29/21: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:07 AM - Re: Europa Classic Pre Purchase Advice (Rowland Carson) 2. 05:50 AM - Re: Europa Classic Pre Purchase Advice (Bud Yerly) 3. 10:03 AM - Re: Arplast, closing down and PV50 support (FrankJScott) 4. 10:03 AM - Re: Cracks on the cockpit module near to the seat belts (FrankJScott) 5. 08:24 PM - Re: UMA RPM gauge with Rotax 914 (rparigoris) ________________________________ Message 1 _____________________________________ Time: 01:07:34 AM PST US From: Rowland Carson Subject: Re: Europa-List: Europa Classic Pre Purchase Advice On 2021-04-29, at 03:45, Griffo wrote: > I have just completed my finale purchase inspection of a Europa Classic. > > If the purchase proceeds, I will probably replace the transceiver > > As you will know the Europa's composite skin facilitates the installation of an internal transceiver antenna. I this case a dipole, in the vertical tail/fin. > > My question is: Is the dipole inherently "tuned" ? or could it require SWR adjustment ? Griffo - the nominal installed length of the dipole does require to be trimmed to get optimum SWR across the aeronautical band. My comm radio (Funkwerk ATR833) requires SWR better than 3 across the operating band. The Europa build manual, appendix C, includes (inter alia) the following: =9CThe recommended antenna for installation is a dipole type, the total length of which is to be a half wave length at the middle of the frequency range (127.35 MHz if you are using a 760 channel radio). The calculated length of the antenna would make each half of the dipole 588 mm (23.15=9D) long; however there are certain effects to be taken into consideration before the final length is determined. =9CEnd effect=9D makes the antenna apparently longer than it is, and so does the =9Cdielectric effect=9D of the glass fibre upon which it is mounted. Both of these effects require the dipole to be shortened to bring the effective length to match the mid-frequency half wave length. The only way to take these effects into account is by use of a Voltage Standing Wave Ratio (VSWR) meter.=9D However, the last sentence of that extract has been overtaken by technology and I found that the easiest way to tune the dipole is by using a nanoVNA. See my build journal at: http://www.rowlandcarson.org.uk/aviation/europa_435/nanovna_final.php I found that the optimum frequency for the minimum SWR was not quite in the centre of the band, but the NanoVNA made it easy to get both ends of the band to the same SWR. It would have been quite tedious doing this with a VSWR meter, which can only take a reading at a single frequency. {I=99m prepared to travel (but not to Australia!) with my NanoVNA to measure other builders=99 antennae, when COVID precautions allow.} If the aircraft you are purchasing has already flown, I would expect that the builder has already done what she can to tune the antenna, and you may not need to worry. But if you decide to replace the comm radio, you=99ll have ready access to the antenna coax and can perform tests at that time. Hope this helps. in friendship Rowland | Rowland Carson ... that's Rowland with a 'w' ... | http://www.rowlandcarson.org.uk | Skype, Twitter: rowland_carson Facebook: Rowland Carson ________________________________ Message 2 _____________________________________ Time: 05:50:16 AM PST US From: Bud Yerly Subject: RE: Europa-List: Europa Classic Pre Purchase Advice If you don't mind paying a bit, I find the AAE composite antennas are trouble free. You can mount the com behind the bulkhead bonded to the fuselage and they work flawlessly. No tuning or anything. Aircraft Spruce has them. I also find the transponder antenna really easy to use. About $120USD for piece of mind plug and play. Bud Yerly -----Original Message----- From: owner-europa-list-server@matronics.com On Behalf Of Griffo Sent: Wednesday, April 28, 2021 10:45 PM Subject: Europa-List: Europa Classic Pre Purchase Advice I have just completed my finale purchase inspection of a Europa Classic. If the purchase proceeds, I will probably replace the transceiver As you will know the Europa's composite skin facilitates the installation of an internal transceiver antenna. I this case a dipole, in the vertical tail/fin. My question is: Is the dipole inherently "tuned" ? or could it require SWR adjustment ? In my research, I checked every Europa Mandatory& Recommended Modification - all Mandatory's have been done EXCEPT a LAA "Standard Modification" No SM11906, Issue 2, "Stabilator Torque Tube Drive Assembly Your comments/advice on this omission wold be much appreciated -------- 46 Read this topic online here: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com%2Fviewtopic.php%3Fp%3D501549%23501549&data=04%7C01%7C%7C54b718a77e164f2bd2d008d90ab9668e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637552613664508866%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=QKZTTOQl6oZVAEYLwvq%2FYHlUM864W7cdX3e%2BvXTBLtQ%3D&reserved=0 ________________________________ Message 3 _____________________________________ Time: 10:03:11 AM PST US Subject: Europa-List: Re: Arplast, closing down and PV50 support From: "FrankJScott" In response to the guy asking about villa for rentv in mivida, duplex for sale in sheikh zayed, penthouse for sale in 6 october, I highly suggest this awesome townhouses details (http://www.happy0511.com/space-uid-1247360.html) or duplex for rent in 6 october, villa for sale in north coast, twin house for rent in mivida, twinhouse for rent in sheikh zayed, penthouse for sale in vye sodic, alongside all this cool twinhouse recommendations (http://www.027hyc.com/space-uid-16416.html) not to mention twinhouse for sale in 6 october, twinhouse for sale in zed towers, penthouse for sale in vye sodic, apartments for rent in maadi, penthouse for sale in eastown, as well as this helpful apartment info (http://www.sygk100.cn/home.php?mod=space&uid=6071877) which is also great. 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See more Newest Tenpoint Crossbow Today (https://www.forumibubapadanguru.com/viewtopic.php?f=8&t=688&p=170506#p170506) 9e27c40 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=501585#501585 ________________________________ Message 5 _____________________________________ Time: 08:24:39 PM PST US Subject: Europa-List: Re: UMA RPM gauge with Rotax 914 From: "rparigoris" Hi Trevor I looked close at my 914 UMA Tach install tonight for you. On Tach Red gets power through a 1 amp circuit breaker. Black I have going to my firewall single point ground (field of tabs). The White wire goes to TCU #13. TCU #26 goes to my firewall single point ground. I suspect pin #13 and #26 are connected to a coil and probably doesn't matter, but if you look close at the schematics I directed you towards it does show #26 with a (-) and that's the one I am sending to ground. A few more notes on the UMA Gauge: If you send it to UMA they can install a Red warning LED that will come on if you over-speed. Also they can install internal EL (Electro Luminescence). If you didn't want to send them your gauge, you can install an EL Light Bezel if your gauge is 2 1/4" or 3 1/8".: https://www.aircraftspruce.com/catalog/inpages/umabezellight.php?clickkey=3738 I have a number of their 1 1/4" gauges and the only option there is internal EL. I'm using the White which is a high color temp and is kinda white blue. We are pretty able to match color temp to LEDs. The EL needs a power supply to generate AC. Ron P. 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