---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 05/24/22: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:28 AM - simple antenna for 704 mHz (rd2) 2. 07:42 AM - Re: simple antenna for 704 mHz (user9253) 3. 08:10 AM - Re: Re: simple antenna for 704 mHz (David Carter) 4. 10:05 AM - Re: Re: simple antenna for 704 mHz (rd2) 5. 10:22 AM - Re: Re: simple antenna for 704 mHz (David Carter) 6. 12:36 PM - Re: Re: simple antenna for 704 mHz (rd2) 7. 01:31 PM - Re: 30A PM alternator and Z101? (Eric Page) ________________________________ Message 1 _____________________________________ Time: 06:28:57 AM PST US From: rd2 Subject: AeroElectric-List: simple antenna for 704 mHz Hi all- I have a SwitcheOn box in a metal hangar to turn on/off the engine heater r emotely with my cell phone. The box uses the IoT cell network at 704 Mhz (~ 42 cm full wave) and the signal strength is dismal, so the box often goes o ffline and I have to drive up to the hangar and restart it, which defeats i ts purpose. With hangar door open, the signal improves. I'd like to build a simple antenna, but my antenna knowledge is limited. Wo uld the following work (see attached screenshot): -strip jacket and outer conductor to expose 42 cm of inner conductor with i nsulation =93 this becomes the full wave antenna; -let that 42 cm antenna hang from top of hangar down along the wall (so as not to anger the FBO); -ground the outer conductor at the antenna end to the metal hangar. Any suggestions, thoughts? Thanks Rumen ________________________________ Message 2 _____________________________________ Time: 07:42:38 AM PST US Subject: AeroElectric-List: Re: simple antenna for 704 mHz From: "user9253" According to this website https://service.shure.com/s/article/quarter-wave-antenna-dimensions?language=en_US a 704Mhz 1/4 wavelength antenna is 4 inches long. Strip about 6 inches of outer insulation from the coax. Push the outer braid so that it expands and slides back over the coax cable. Trim the outer braid so that it is 4 inches long. This acts as a ground plane. Cut the center conductor so that 4 inches is exposed. Do not connect to metal hangar. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507041#507041 ________________________________ Message 3 _____________________________________ Time: 08:10:51 AM PST US From: David Carter Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz I bought an inexpensive magnetic mount external antenna for my GSM / 4G switch (different brand from yours, but works the same.) https://smile.amazon.com/SUPERBAT-Magnetic-External-Antenna-T-Mobile/dp/B09GFCZ35B There are lots of similar antennas available on Amazon. Here's one with a non-magnetic mount: https://smile.amazon.com/Bingfu-Waterproof-T-Mobile-Cellular-Amplifier/dp/B07R9JGLV5 --- David Carter david@carter.net On Tue, May 24, 2022 at 10:43 AM user9253 wrote: > > According to this website > > https://service.shure.com/s/article/quarter-wave-antenna-dimensions?language=en_US > a 704Mhz 1/4 wavelength antenna is 4 inches long. > Strip about 6 inches of outer insulation from the coax. > Push the outer braid so that it expands and slides back over the coax > cable. > Trim the outer braid so that it is 4 inches long. This acts as a ground > plane. > Cut the center conductor so that 4 inches is exposed. > Do not connect to metal hangar. > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=507041#507041 > > ________________________________ Message 4 _____________________________________ Time: 10:05:48 AM PST US From: rd2 Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz Thanks David, however an antenna that looks like an antenna is what I want to avoid due to FBO restrictions. ----- Original Message ----- From: David Carter Sent: Tue, 24 May 2022 11:10:05 -0400 (EDT) Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz I bought an inexpensive magnetic mount external antenna for my GSM / 4G switch (different brand from yours, but works the same.) https://smile.amazon.com/SUPERBAT-Magnetic-External-Antenna-T-Mobile/dp/B09GFCZ35B There are lots of similar antennas available on Amazon. Here's one with a non-magnetic mount: https://smile.amazon.com/Bingfu-Waterproof-T-Mobile-Cellular-Amplifier/dp/B07R9JGLV5 --- David Carter david@carter.net On Tue, May 24, 2022 at 10:43 AM user9253 wrote: According to this website https://service.shure.com/s/article/quarter-wave-antenna-dimensions?language=en_US a 704Mhz 1/4 wavelength antenna is 4 inches long. Strip about 6 inches of outer insulation from the coax. Push the outer braid so that it expands and slides back over the coax cable. Trim the outer braid so that it is 4 inches long. This acts as a ground plane. Cut the center conductor so that 4 inches is exposed. Do not connect to metal hangar. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507041#507041 ========== - Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List ========== FORUMS - eferrer" target="_blank">http://forums.matronics.com ========== WIKI - errer" target="_blank">http://wiki.matronics.com ========== b Site - -Matt Dralle, List Admin. ="noreferrer" target="_blank">https://matronics.com/contribution ========== ________________________________ Message 5 _____________________________________ Time: 10:22:00 AM PST US From: David Carter Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz On Tue, May 24, 2022 at 1:06 PM rd2 wrote: > Thanks David, however an antenna that looks like an antenna is what I want > to avoid due to FBO restrictions. > > 100% understand. I found that all I needed to do with mine was to raise it a few feet on the interior wall of the metal t-hangar to get adequate reception. The fire-resistant dividing walls in the hangar are sheetrock attached with screws. The magnetic base of the antenna grips one of the screw heads about 10' up & very close to the sliding metal door. It's inside, so no one is the wiser. --- David Carter david@carter.net > ________________________________ Message 6 _____________________________________ Time: 12:36:37 PM PST US From: rd2 Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz Yeah, I tried this method, but it did not work... had a similar 8 dB antenna (supposedly) specifically tuned to my frequency from amazon. Magnetic base on a T-shaped bracket high (close to ceiling) electrically connected to hangar wall. (all my T-hangar walls are sheet metal); have a way to measure signal strength - no difference...seems the only way is to bring a camouflaged antenna to the outside. ----- Original Message ----- From: David Carter Sent: Tue, 24 May 2022 13:21:17 -0400 (EDT) Subject: Re: AeroElectric-List: Re: simple antenna for 704 mHz On Tue, May 24, 2022 at 1:06 PM rd2 wrote: Thanks David, however an antenna that looks like an antenna is what I want to avoid due to FBO restrictions. 100% understand. I found that all I needed to do with mine was to raise it a few feet on the interior wall of the metal t-hangar to get adequate reception. The fire-resistant dividing walls in the hangar are sheetrock attached with screws. The magnetic base of the antenna grips one of the screw heads about 10' up & very close to the sliding metal door. It's inside, so no one is the wiser. --- David Carter david@carter.net ________________________________ Message 7 _____________________________________ Time: 01:31:32 PM PST US Subject: AeroElectric-List: Re: 30A PM alternator and Z101? From: "Eric Page" Paul Dye's write-up on the Monkworkz MZ-30L: https://www.kitplanes.com/the-monkworkz-mz-30l-direct-drive-generator/ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507050#507050 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.