---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 11/07/19: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 05:57 AM - Please Make A Contribution To Support Your Lists (Matt Dralle) 1. 05:06 AM - =?utf-8?Q?Re:__Using_a_BNC_=9CT=9D? (Carlos Trigo) 2. 05:22 AM - =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBVc2luZyBhIEJOQyDigJxU4oCd? (Kelly McMullen) 3. 05:42 AM - =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBSZTogQWVyb0VsZWN0cmljLUxpc3Q6IFVzaW5nIA==?= =?UTF-8?B?YSBCTkMg4oCcVOKAnQ==? (Christopher Cee Stone) 4. 07:06 AM - =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBVc2luZyBhIEJOQyDigJxU4oCd? (Dj Merrill) 5. 07:36 AM - =?Windows-1252?Q?Re:__Re:_AeroElectric-List:_Using_a_BN?= =?Windows-1252?Q?C_=93T=94? (John MacKenzie) ________________________________ Message 0 _____________________________________ Time: 05:57:20 AM PST US From: Matt Dralle Subject: AeroElectric-List: Please Make A Contribution To Support Your Lists Dear Listers, There is no advertising income to support the Matronics Email Lists and Forums. The operation is supported 100% by your personal Contributions during the November Fund Raiser. Please make your Contribution today to support the continued operation and upgrade of these services. You can pick up a really nice gift for making your Contribution too! You may use a Credit Card or Paypal at the Matronics Contribution Site here: http://www.matronics.com/contribution or, you can send a personal check to the following address: Matronics / Matt Dralle 581 Jeannie Way Livermore, CA 94550 Thank you in advance for your generous support! Matt Dralle Matronics Email List and Forum Administrator ________________________________ Message 1 _____________________________________ Time: 05:06:39 AM PST US From: Carlos Trigo Subject: =?utf-8?Q?Re:_AeroElectric-List:_Using_a_BNC_=9CT=9D? Thank you Eric Is there any automatic coaxial switch? Can you please point me out to a suitable coaxial switch (eBay, Amazon, mous er, ...). Cheers Carlos Enviado do meu iPhone > No dia 07/11/2019, =C3-s 05:20, Eric Page escreveu: > > =EF=BB >> On Nov 6, 2019, at 4:23 PM, Carlos Trigo wrote: >> >> I have just installed a 2nd Comm antenna in my aircraft... > > > > Carlos, the short answer is no. The extra length of open-ended coax will r uin the impedance match between either radio and the antenna, and transmitti ng on one radio with the other connected through the tee might well result i n (expensive) tears. > > This situation calls for either: > > 1) A coaxial switch that connects the antenna to only a single radio at a t ime and disconnects the other; or, > > 2) Delete the tee and leave both lengths of coax in place. Connect the an tenna to the coax feeding your handheld for now. When you later install the Comm 2 radio, connect that coax at the antenna and remove or abandon the on e to the handheld. > > Eric ________________________________ Message 2 _____________________________________ Time: 05:22:21 AM PST US Subject: AeroElectric-List: =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBVc2luZyBhIEJOQyDigJxU4oCd? From: Kelly McMullen I am not aware of any suitable switch. Icom used to offer, (and King before them) a small box that made the switch when antenna cable for handheld was plugged in. Not elegant, but mostly worked. If you terminate the cable in location easily reached, it may be better to simply disconnect cable from one radio and connect it to the other. Kelly On 11/7/2019 6:04 AM, Carlos Trigo wrote: > Thank you Eric > > Is there any automatic coaxial switch? > Can you please point me out to a suitable coaxial switch (eBay, Amazon, > mouser, ...). > > Cheers > Carlos > > > Enviado do meu iPhone > >> No dia 07/11/2019, s 05:20, Eric Page escreveu: >> >> >> On Nov 6, 2019, at 4:23 PM, Carlos Trigo > > wrote: >> >>> I have just installed a 2nd Comm antenna in my aircraft... >> >> >> Carlos, the short answer is no. The extra length of open-ended coax >> will ruin the impedance match between either radio and the antenna, >> and transmitting on one radio with the other connected through the tee >> might well result in (expensive) tears. >> >> This situation calls for either: >> >> 1) A coaxial switch that connects the antenna to only a single radio >> at a time and disconnects the other; or, >> >> 2) Delete the tee and leave both lengths of coax in place. Connect >> the antenna to the coax feeding your handheld for now. When you later >> install the Comm 2 radio, connect that coax at the antenna and remove >> or abandon the one to the handheld. >> >> Eric ________________________________ Message 3 _____________________________________ Time: 05:42:50 AM PST US From: Christopher Cee Stone Subject: AeroElectric-List: =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBSZTogQWVyb0VsZWN0cmljLUxpc3Q6IFVzaW5nIA==?= =?UTF-8?B?YSBCTkMg4oCcVOKAnQ==? Bob has a cartoon assembly guide to rolling your own... very simple all in a small project box. -chris On Thu, Nov 7, 2019 at 5:26 AM Kelly McMullen wrote: > kellym@aviating.com> > > I am not aware of any suitable switch. Icom used to offer, (and King > before them) a small box that made the switch when antenna cable for > handheld was plugged in. Not elegant, but mostly worked. > If you terminate the cable in location easily reached, it may be better > to simply disconnect cable from one radio and connect it to the other. > Kelly > > On 11/7/2019 6:04 AM, Carlos Trigo wrote: > > Thank you Eric > > > > Is there any automatic coaxial switch? > > Can you please point me out to a suitable coaxial switch (eBay, Amazon, > > mouser, ...). > > > > Cheers > > Carlos > > > > > > Enviado do meu iPhone > > > >> No dia 07/11/2019, =C3-s 05:20, Eric Page escrev eu: > >> > >> =EF=BB > >> On Nov 6, 2019, at 4:23 PM, Carlos Trigo >> > wrote: > >> > >>> I have just installed a 2nd Comm antenna in my aircraft... > >> > >> > >> Carlos, the short answer is no. The extra length of open-ended coax > >> will ruin the impedance match between either radio and the antenna, > >> and transmitting on one radio with the other connected through the tee > >> might well result in (expensive) tears. > >> > >> This situation calls for either: > >> > >> 1) A coaxial switch that connects the antenna to only a single radio > >> at a time and disconnects the other; or, > >> > >> 2) Delete the tee and leave both lengths of coax in place. Connect > >> the antenna to the coax feeding your handheld for now. When you later > >> install the Comm 2 radio, connect that coax at the antenna and remove > >> or abandon the one to the handheld. > >> > >> Eric =========== =========== =========== =========== =========== =========== > > ________________________________ Message 4 _____________________________________ Time: 07:06:37 AM PST US Subject: AeroElectric-List: =?UTF-8?B?UmU6IEFlcm9FbGVjdHJpYy1MaXN0OiBVc2luZyBhIEJOQyDigJxU4oCd? From: Dj Merrill Hi Carlos, I have a Narco VP-16 antenna switch that I'm not using. Asking $25 + s/h. It uses an electrical relay to switch between the two radios, so you could have a toggle switch mounted on the panel to select which radio is connected to the antenna for example, or possibly get fancy and figure out a circuit to have it switch when you key the mic on the second radio. https://deej.net/forsale/#narco IMHO it would be better to mount a second antenna on your plane and have a dedicated antenna for each radio. -Dj On 11/7/19 8:04 AM, Carlos Trigo wrote: > Thank you Eric > > Is there any automatic coaxial switch? > Can you please point me out to a suitable coaxial switch (eBay, Amazon, > mouser, ...). > > Cheers > Carlos -- Dj Merrill - N1JOV - EAA Chapter 87 Currently Flying: Glastar Previously: Cessna 150 - Glasair 1 FT - Grumman AA1B ________________________________ Message 5 _____________________________________ Time: 07:36:44 AM PST US From: John MacKenzie Subject: =?Windows-1252?Q?Re:_AeroElectric-List:_Re:_AeroElectric-List:_Using_a_BN?= =?Windows-1252?Q?C_=93T=94? Please remove from mailing list ________________________________ From: owner-aeroelectric-list-server@matronics.com on behalf of Dj Merrill Sent: Thursday, November 7, 2019 8:04 AM os Trigo Subject: AeroElectric-List: Re: AeroElectric-List: Using a BNC =93T=94 Hi Carlos, I have a Narco VP-16 antenna switch that I'm not using. Asking $25 s/h. It uses an electrical relay to switch between the two radios, so you could have a toggle switch mounted on the panel to select which radio is connected to the antenna for example, or possibly get fancy and figure out a circuit to have it switch when you key the mic on the second radio. https://deej.net/forsale/#narco IMHO it would be better to mount a second antenna on your plane and have a dedicated antenna for each radio. -Dj On 11/7/19 8:04 AM, Carlos Trigo wrote: > Thank you Eric > > Is there any automatic coaxial switch? > Can you please point me out to a suitable coaxial switch (eBay, Amazon, > mouser, ...). > > Cheers > Carlos -- Dj Merrill - N1JOV - EAA Chapter 87 Currently Flying: Glastar Previously: Cessna 150 - Glasair 1 FT - Grumman AA1B ------------------------------------------------------------------------------------- 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.