[amsat-bb] Re: full duplex w/ 2 HT's
On 02/06/12 17:33, Robert Coppock wrote: hola, i am trying to determine the best way to work full duplex on the birds with 2 HT's or radios. i cannot find any info so far on the web. my concern is to keep the transmit power out of the receive radio, i guess basically the difference between a diplexer and duplexer. since i am efficient (lazy) i thought i would just look for suggestions here while i am checking google also. what do i need, di/du/ plexer, and what is the correct wiring scheme ? i will be using the arrow antenna without the built in duplexer, from the 2 feeds (vhf/uhf) and 2 HT's for now. my picture of it so far, is to wire the vhf radio direct to the vhf feed port on the arrow, and have the uhf port on the arrow come into a duplexer, with the duplexer uhf port going to the uhf radio, and the duplexer vhf port terminated into a 50 ohm dummy load. also, any suggestions of specific duplexers would be appreciated. i think i started on this project a few years ago, but never got around to get! ti! ng it all together. grazie mille, Robert k f 0 gcn81 in the woodwork, literally, shasta/klamath national forests. Duplexers are for the same band, diplexers are for splitting bands. So, you want a diplexer for this. HB9ABX did a nice design but apparently doesn't want to give it out any more. I'm sure a quick Google will reveal the sickening truth that you cannot hide from the Internet. -- Gordonjcp MM0YEQ ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] pa5rwe / chris
"hams never die, they just go to ground" rest in peace, Chris my neighbors and i listened to this at full volume via my stereo, celebrate life ! =(it's and upside down I) http://www.youtube.com/watch?v=g4ouPGGLI6Q ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] EN-0?
Someone was looking to work EN-02 or 03 or one of the low EN numbers.. I'll be headed south Wednesday and should be able to activate something on SO-50 or AO-27. If you need one of those grids please let me know. 73, Joe kk0sd ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Icom Power Cord
I believe the IC-910 also uses the IC-OPC-657A power cord - if that helps in your searching. Clint K6LCS >> ... IC-821 ... ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] A great suggestion
A great suggestion was made for a simple addition to the program written for demos and education. You can now add your own images to the little slide show that takes place in the lower right hand portion of the screen. This is a good way to personalize your presentation by including images that are of specific interest to your group or add images that for one reason or another are not included in the program. If any group or organization would like an image added to the gallery and/or included with the program distribution just send me your request in an email with the image attached and I will try to include it. If any registered trademark or copyright issues are involved with the image simply add a line or two to your request authorizing use of the image in this application. The updated version of the program, information on how to add your own images and a little gallery of images to try out is on the web site. http://www.tomdoyle.org/simplesatlookdown Have Fun - 73 W9KE Tom Doyle ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] 1K grids
Congrats to Jerry, K5OE. He just submitted his VUCC upgrade to 1,000 grids today, actually 1,008 but who's counting. It was an easy set of cards to check. About 30 from a bunch of hams and 100 or so grids from Yuri. Not a bad haul. and... I have never worked Yuri on satellite. 73...bruce Sent from my iPhone ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: full duplex w/ 2 HT's
Robert: I have used a duplexer on the UHF side of my satellite ops for several years. I find that some radios have more of a desense problem than others. Here is a link to my website where I briefly talk about what I do on portable ops and using what is referred to as a Mode J filter - http://www.ka4kyi.com/satellite_gear/misc_equipment/ Ron Nutter KA4KYI AMSAT Area Coordinator for Missouri On 6/2/12 11:33 AM, Robert Coppock wrote: hola, i am trying to determine the best way to work full duplex on the birds with 2 HT's or radios. i cannot find any info so far on the web. my concern is to keep the transmit power out of the receive radio, i guess basically the difference between a diplexer and duplexer. since i am efficient (lazy) i thought i would just look for suggestions here while i am checking google also. what do i need, di/du/ plexer, and what is the correct wiring scheme ? i will be using the arrow antenna without the built in duplexer, from the 2 feeds (vhf/uhf) and 2 HT's for now. my picture of it so far, is to wire the vhf radio direct to the vhf feed port on the arrow, and have the uhf port on the arrow come into a duplexer, with the duplexer uhf port going to the uhf radio, and the duplexer vhf port terminated into a 50 ohm dummy load. also, any suggestions of specific duplexers would be appreciated. i think i started on this project a few years ago, but never got around to get! ti! ng it all together. grazie mille, Robert k f 0 gcn81 in the woodwork, literally, shasta/klamath national forests. ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb . ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: full duplex w/ 2 HT's
So, all the on-line information seems to point to this solution - putting a diplexer (filter) on the 70cm side to tap off and absorb the incoming 2m signal. Isn't there also a design where one puts a filter on the 2m side, to tap off and absorb the 70 cm (3rd harmonic of 2m) signal? I would think that any (reasonable) 70cm receiver would have enough rejection for a signal so far out of band, but the in-band 3rd harmonic can only be taken care of at its source. At least, I think that's the logic. Is there anything worthy about the other design, or is the most common problem that our HTs can't possibly deal with a strong 2m signal on the 70cm side because of their "DC to Daylight" receivers? I've been on the mode-J birds without much of a problem with this sort of desense, though I did have a lot of trouble on AO-40 with reflected RF when aiming through a big oak tree behind the house. The 70cm uplink was interfering with the 13cm downlink, and I was pretty sure at the time that it was a 3rd harmonic sort of problem. Just curious, Greg KO6TH Ronald Nutter wrote: Robert: I have used a duplexer on the UHF side of my satellite ops for several years. I find that some radios have more of a desense problem than others. Here is a link to my website where I briefly talk about what I do on portable ops and using what is referred to as a Mode J filter - http://www.ka4kyi.com/satellite_gear/misc_equipment/ Ron Nutter KA4KYI AMSAT Area Coordinator for Missouri On 6/2/12 11:33 AM, Robert Coppock wrote: hola, i am trying to determine the best way to work full duplex on the birds with 2 HT's or radios. i cannot find any info so far on the web. my concern is to keep the transmit power out of the receive radio, i guess basically the difference between a diplexer and duplexer. since i am efficient (lazy) i thought i would just look for suggestions here while i am checking google also. what do i need, di/du/ plexer, and what is the correct wiring scheme ? i will be using the arrow antenna without the built in duplexer, from the 2 feeds (vhf/uhf) and 2 HT's for now. my picture of it so far, is to wire the vhf radio direct to the vhf feed port on the arrow, and have the uhf port on the arrow come into a duplexer, with the duplexer uhf port going to the uhf radio, and the duplexer vhf port terminated into a 50 ohm dummy load. also, any suggestions of specific duplexers would be appreciated. i think i started on this project a few years ago, but never got around to get! ti! ng it all together. grazie mille, Robert k f 0 g cn81 in the woodwork, literally, shasta/klamath national forests. ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb . ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: A great suggestion
Brilliant! Great program ... accurate tracking ... simple and elegant - GREAT work, Tom. Clint Bradford K6LCS http://www.work-sat.com ___ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
