[digitalradio] One way propogation?

2009-05-25 Thread Vlad UA6JD
Few days ago I copy Javier , KH2QII/KH6 , on 14076 JT65a with peak -16dB (!) - he report that using 30 watts vertical. I try call him with 100 watts and 6 el YAGI and he told me that no copy me. Today I am CQing on 14076 and few stations on West Coast reports that copy me with no less then -20dB

[digitalradio] Re: One way propogation?

2009-05-25 Thread Andrew O'Brien
--- In digitalradio@yahoogroups.com, Vlad UA6JD jt...@... wrote: Few days ago I copy Javier , KH2QII/KH6 , on 14076 JT65a with peak -16dB (!) - he report that using 30 watts vertical. I try call him with 100 watts and 6 el YAGI and he told me that no copy me. Today I am CQing on 14076 and

[digitalradio] SSB Phone versus other modes

2009-05-25 Thread Andrew O'Brien
I wonder why some folks bother with phone, especially under weak conditions. It sure is fun to just talk but the performance of SSB phone versus other modes continues to amaze me. Trying for the LOTW TP award has caused me to use SSB phone more of late, and I am often encountering situations

RE: [digitalradio] SSB Phone versus other modes

2009-05-25 Thread David Little
Andy, This is a topic of discussion that is raging on behind the lines in Emergency Communications also. The fundamental thing that many miscalculate is how the Intel that is to be sent digitally is gathered and relayed to someone with the capabilities to digitize In this debate, a lot of

Re: [digitalradio] SSB Phone versus other modes

2009-05-25 Thread Alan Barrow
Andy wrote: Today for example, I worked NX7F 559 on CW, then barely readable on phone, 339 at best, then 100% copy on PSK31. I know your point is really about digital modes required S/N, but a bit of a pet peeve on the CW operations it's perceived usefulness as a backup mode: I find that

Re: [digitalradio] SSB Phone versus other modes

2009-05-25 Thread Rick W
When it comes to emergency communications, phone is not an option, but a necessary mode for most conditions. It is the only practical mode that gives you the instant knowledge that someone has received your information. Nothing else can ever take the place of human speech in such cases due to

[digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread Andrew O'Brien
I am tempted to try get active on 6M-70cm for digital modes and CW this summer. I am looking to avoid multiple runs of coax and thought of a homebrewed log periodic for these bands, using one feedline . Does anyone here use one, or have favorite software for log periodic design? Is the

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
Hi Andy, I operate 2 meters and 70 cm every day from here in Mount Pleasant. You really need 14 dBi of antenna gain on 2 meters and 17 dBi on 70 cm to reach 200 miles on phone if there is no propagation enhancement. A log-periodic will probably not have enough gain on any one of the bands it

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
Andy, Another excellent high gain antenna for either 2 meters or 70 cm that can be homebrewed is the quagi: http://commfaculty.fullerton.edu/woverbeck/quagi.htm You will be happiest with at least this much gain on either band. 73, Skip KH6TY Andrew O'Brien wrote: I am tempted to try get

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread Andy obrien
Thanks Skip, I had a K1FO design 2M beam but took it apart , too big for me. I also have old large 2M and 440 cross polarized Yagis laying in the garage doing nothing , but again too much antenna for my back yard these days. Your SS5 skeleton-slot beam is a clever design. What is the actual

Re: [digitalradio] 6M 2M 70cm Periodic for digital operations

2009-05-25 Thread kh6ty
The SS5 is a true skeleton-slot beam with five skeleton-clot elements. Each one is a skeleton-slot. The overall dimentions are 13 x 2 plus the width: Reflector width: 7 5/8 Driven element width: 6 1/4 D1 width: 6 1/4 D2 width: 6 1/8 D3 width: 5 7/8 I standardized on the height of each

[digitalradio] Re: One way propogation?

2009-05-25 Thread aa777888athotmaildotcom
If everyone is running the same antenna oriented the same way then it ought to be reciprocal paths. However that is rarely the case and it would seem not too unusual that forward and reverse paths are often different, sometimes substantially so. I'm always amazed how many verticals I can work