[digitalradio] Digital Frequencies

I was looking back at the introductory letter and noticed that it never mentioned a lot of bands... * 20 Meters: Primary : 14.078.4 (14077.4 and 1000 Hz AF frequency) Secondary: 14.076.4 (14075.4 and 1000 Hz AF frequency) 30 Meters: Primary: 10.142 Secondary: 10.144 8

Re: [digitalradio] Dev: Multipath

The testing that was done on DRM showed that the worst multipath spread is on NVIS paths and is about 8 ms. They originally could accomodate only about 5 ms of multipath but had to create a new mode with a longer guard interval to support South American stations using the 41, 49, 60, 75, 90 and

Re: [digitalradio] Dev: Real to I/Q

You may be thinking of mixing the real signal with cosine and sine signals at 1/4 the sampling rate. The sequence can be +1, 0, -1, 0 and 0, +1, 0, -1 for cosine and sine or +1, +1, -1, -1 and +1, -1, -1, +1. In the first case, computation can be minimized if the next stage is a FIR filter as al

Re: [digitalradio] Re: Imitating the big guys

Rick wrote: > Dave seems to have the high ground on this discussion. Some of Jose's > comments lately seem to be very specious, which surprises me since he > has normally been fairly logical in his comments. I am concerned that > Jose is claiming that Dave does not accept the hidden transmitte

Re: [digitalradio] Re: Imitating the big guys

Beware ! Do you see how you act? Nowhere in my text it says it is useless, it just says it is unavailable. Isn't it ? Those are very different words. Dave Bernstein wrote: AA6YQ comments bloew > > --- In digitalradio@yahoogroups.com, Jose Amador <[EMAIL PROTECTED]> wrote: > >>> You've

[digitalradio] VK/ZL 30 meter Digital Weekend Event

VK/ZL 30 meter Digital Weekend Event When: October 20th starting at 0500UTC (6PM NZDT Saturday) and ending October 21st at 2000UTC (9AM NZDT Monday). Where: 30 meter Band 10.135 to 10.145 MHZ Modes: Mainly PSK31 BUT all digital modes welcomed including RTTY. Objective: To make contact

Re: [digitalradio] Advantages of D-STAR Digital Voice & Data

Mark, I think that you have more of a seller's interest in D-Star and I have a buyers interest. You spend a great deal of time promoting D-Star and wanting other hams to adopt this protocol and even doing presentations to a number of groups. Which is of course your prerogative and interest. Bu

[digitalradio] Re: Dev: Real to I/Q

> How do I change from a real signal to quadrature? Look into gMFSK sources, search for Hilbert transformation. Basically, one filters the input signal through two low pass filters, one results in real, the other in imaginatory component. > Also, do I remember that after the conversion the sampli

Re: [digitalradio] Advantages of D-STAR Digital Voice & Data

Rick - I've seen you mention these negatives about D-STAR several times on various lists so I've felt compelled to respond. I grew up in a rural area of Wisconsin similar to where you live. In a low density area of population is difficult to support many things out of the mainstream initiall

Re: [digitalradio] Re: Imitating the big guys

Dave Bernstein wrote: AA6YQ comments bloew --- In digitalradio@yahoogroups.com, Jose Amador <[EMAIL PROTECTED]> wrote: You've argued that the SCAMP busy detector is useless because its not publicly available, even though it was developed by the Winlink team and remains in their

[digitalradio] Re: OT: Inverter suggestions?

Thanks for the reply Rick. I am glad that you pointed out the draw on DC. The PC requires 2.5 amps AC. I only have one line running from battery that I used to use for a FT-100d. Really don't want to run another wire. I did some searching and found a 12 cell battery 6600mAh battery that is sup

[digitalradio] Dev: Real to I/Q

How do I change from a real signal to quadrature? I know I have read how to do this but cannot find a reference that goes beyond multiplying by cos/sin to get I/Q. I seem to recall a trick with alternating sign sequence of 1's. I actually implemented the cos/sin technique but get 0s in alternatin

Re: [digitalradio] Wanted - Pactor-I / G-Tor Skeds

Not really Andy. Pactor is a LSB mode whereas 65A is a USB mode. with 1kc between the two. Should not bother each other. At 04:25 PM 10/15/2007, you wrote: >7075 and 14075 is smack on the usual frequency for that new fangled JT65A >stuff. > >Andy

Re: [digitalradio] Re: Imitating the big guys

If PSKMail existed back then, I wasn't aware of it. It was not our >goal to replace Winlink, but rather to provide it with a better >transport protocol that could use PC-hosted soundcards instead of >hardware TNCs and would not QRM other stations. So why do we not have such a thing today?

Re: [digitalradio] Wanted - Pactor-I / G-Tor Skeds

7075 and 14075 is smack on the usual frequency for that new fangled JT65A stuff. Andy On 10/15/07, F.R. Ashley <[EMAIL PROTECTED]> wrote: > > > > > > > The Pactor/Amtor "calling frequency used to be 14.075, LSB. This was years > ago. 7.075 LSB for 40 meters. > Im on 20 right now. > > 73 Bud

[digitalradio] Re: Imitating the big guys

>>>AA6YQ comments below --- In digitalradio@yahoogroups.com, Rick <[EMAIL PROTECTED]> wrote: >snip< Now Dave, you are claiming that three of the top programmers of radio amateur software in the world offered to help Winlink 2000 and they turned you down? When did this happen? Before they devel

[digitalradio] Re: Imitating the big guys

>>>AA6YQ comments bloew --- In digitalradio@yahoogroups.com, Jose Amador <[EMAIL PROTECTED]> wrote: > > You've argued that the SCAMP busy detector is useless because > > its not publicly available, even though it was developed by the > > Winlink team and remains in their possession. Where? N

Re: [digitalradio] D-Star use in UK?

The negatives of D-Star seem to me: 1) It has lower audio quality than FM voice, especially for average to strong signals. This is very disappointing to me. 2) The design to cripple the text data portion on the 2 meter/440 bands is most unfortunate. They would have been much better off to desig

Re: [digitalradio] Re: Busy frequency detection

From what the Winlink 2000 owners have said in the past, they want to control at least two frequencies per band in order to maximize access to their scanning automatic stations. There is no question that they consider the Winlink 2000 system to be much more important than contacts between two

Re: [digitalradio] Re: Imitating the big guys

Dave seems to have the high ground on this discussion. Some of Jose's comments lately seem to be very specious, which surprises me since he has normally been fairly logical in his comments. I am concerned that Jose is claiming that Dave does not accept the hidden transmitter issue, which is pre

Re: [digitalradio] Wanted - Pactor-I / G-Tor Skeds

The Pactor/Amtor "calling frequency used to be 14.075, LSB. This was years ago. 7.075 LSB for 40 meters. Im on 20 right now. 73 Buddy WB4M - Original Message - From: "Tony" <[EMAIL PROTECTED]> To: Sent: Monday, October 15, 2007 3:38 PM Subject: [digitalradio] Wanted - Pactor-I / G-T

[digitalradio] Wanted - Pactor-I / G-Tor Skeds

All: Available for Pactor-I and G-Tor skeds - 20 / 40 meters. Tony - K2MO

Re: [digitalradio] Re: Imitating the big guys

Dave Bernstein escribió: > >>> You've made lots of wild allegations, Jose, but substantiated > none of them. Who? Me? The one who has attempted to make me slip on a banana peel is you, . That is unnaceptable, and a waste of time. > You've accused me of denying the basic principal upon > whi

[digitalradio] Re: Imitating the big guys

>>>AA6YQ comments below --- In digitalradio@yahoogroups.com, "Jose A. Amador" <[EMAIL PROTECTED]> wrote: *** Then why did you bring up the point that PMBOs can detect ongoing QSOs in Pactor? If you weren't suggesting this as a solution, then what was your intention? I was merely describing a

Re: [digitalradio] Visa Laptop Microphone

Hello Rud, have you tested in software adjustment (menu Mixer in the Configuration window)? If you don't success, let me a message ([EMAIL PROTECTED]) , we will see what sound card inputs and outputs Windows sees in your computer. 73 Patrick - Original Message - From: Rud Merr

[digitalradio] FW: [STXARES] KB5HCD downtime ---- DStar

Just an FYI of what is happening with D-Star south of me in Houston / Harris county. Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alan Isaachsen

Re: [digitalradio] Re: Imitating the big guys

Dave Bernstein wrote: > *** more AA6YQ comments > *** Then why did you bring up the point that PMBOs can detect ongoing > QSOs in Pactor? If you weren't suggesting this as a solution, then > what was your intention? I was merely describing a fact, not suggesting anything as you so quickly i

RE: [digitalradio] Visa Laptop Microphone

Hi John, I did enough testing with snapping fingers to convince myself the internal mike is shut off when the external input is connected. Also, when it does work I can see some signals in the waterfall and they move if I tune the rig. I know wish I had tested this last week because I might have

[digitalradio] Re: Busy frequency detection

Remember, this was a couple of years ago. Plus, it really doesn't matter if it is kb2kb interfering with a pmbo session or two pmbo sessions. There was obviously no busy detection nor did the interfering operators listen first. It was still pactor on pactor interference and that is the point. J

RE: [digitalradio] Visa Laptop Microphone

Hi Rud; Had similar problems with a Sony laptop when I was setting it up for Echolink and digital modes. Open up the volume controls on the computer and see what I muted and what is open, and adjust the levels as well. If you mute the microphone input and just use the .wav input , it seem

Re: [digitalradio] Re: Busy frequency detection

Jim you really can't go by that. I had 4 KB2KB QSO's last evening right on 7077.4 as you put it a "published winlink channels". One of the QSO's was with a member of this list K2MO. In fact it's been weeks since my WinLink system has been used. Everything has been KB2KB. Pactor KB2KB is far from d

Re: [digitalradio] Re: Imitating the big guys

Practically speaking, there were two issues that the Winlink 2000 owners tried to address: 1) Have a workable sound card mode. SCAMP = Sound Card Amateur Messaging Protocol) 2) Have busy detection built in. There was no time as a beta tester that I did not have the busy signal detection. The

Re: [digitalradio] OT: Inverter suggestions?

Hi Zack, I have asked this question too and recently took a chance with a Black and Decker MAXX SST series power inverter. They have several different sizes and my daughter wanted one for her laptop in her car and found a deal on the internet under $20 each, if you buy two and with no shipping

Re: [digitalradio] D-Star use in UK?

Rick wrote: > The problem that I have, is that except for narrower bandwidth and some > non amateur radio applications through the internet, I just have not > been able to come up with solid reasons. And there are some serious > negative trade offs you have to make. > > Thanks for the feedba

Re: [digitalradio] D-Star use in UK?

Dave, Like you say, it is the chicken and egg situation, and that goes for most of us because there are few places that have other users. You have to get a nucleus of promoters in your area who can explain to other hams all the benefits of why they would want to go to a new technology. The pro

[digitalradio] D-Star use in UK?

I'm considering getting a new radio for the car and the choice, at the moment, is between the Icom IC-E2820, with the optional UT-123 board, or the Kenwood TM-D710E or V71E. Depending on whether I decide that I'm going to be active with APRS again in the future. Now, all the other specificatio

[digitalradio] Re: Busy frequency detection

Because it was occurring right on published winlink channels. Could some of them been kb2kb, sure, some of them could have been. However, even then, there weren't that many kb2kb qso's on pactor taking place in the auto sub-bands. Why do you think winlink has spread their stations out? Without

[digitalradio] OT: Inverter suggestions?

Can anyone suggest a DC to AC inverter that is low in EMI? I have a Flex-5000 rig that needs a laptop to function. I would like to use the rig and laptop for WSJT hilltopping. The laptop is an HP Pavilion zv6000 that requires 18.5v 6.5A. The connector to the laptop has a strange 5 pin connector.

[digitalradio] Visa Laptop Microphone

I am getting setup for HF digital. I plan on using my HP Windows Vista Home Premium system. I installed MultiPSK because I want to see how the FAE and ALE modes work. Something is not working right with the microphone input, the only input on the laptop. MultiPSK would not see any input level or