In the 70’s I had two FCC guys visit my home and asked to test my equipment. I complied and just got a warning as I had played 30 sec of music and I think I cursed. I was perhaps 12 years old. I was not running an amp.
(MOBILE) 991A AND ATAS-120A tuning issues
- Thread starter Ghostnotes
- Start date
Ghostnotes
Member
That makes sense.
I have the duplexer installed. It seems to tune better with it installed. I only had a few minutes to listen for anything but there was not much of anything this time of night. Will try to listen in tomorrow during the day. 3:30am wake up means it's time to go to bed.
I have the duplexer installed. It seems to tune better with it installed. I only had a few minutes to listen for anything but there was not much of anything this time of night. Will try to listen in tomorrow during the day. 3:30am wake up means it's time to go to bed.
Ghostnotes
Member
So after work last night. I had the some time to listen in om 20m and it was very busy untill about 9pm MT then it started fading out. However, I think the duplexer is interfereing with the ATAS opration because it absolutely will not tune on 2m and 70cm. It tried before the duplexer, but not now. Dosent even try to move.
If I'm reading correctly, you installed a diplexer to split of VHF/UHF to a separate antenna than the ATAS used for HF/6M. Is that correct? If so, no, you won't be tuning 2m/70cm, as you are connected to a separate antenna and no RF is getting to the ATAS in those bands to tune anything.
There's a note in the FT-991A owner's manual about grounding and the control voltage for the ATAS-120A. I'm not sure what this note means or how you would implement it. Maybe a phone call to Yaesu Tech Support would clear it up:
Ghostnotes
Member
You beat me to it. And, I agree it's kind of cryptic. Because in theory, without seeing an internal diagram it is in series, unless they share a common ground. Then how do you isolate it from common to what would be a closed loop?
Or, are they suggesting a jumper across the connectors? Maybe cause that circuit is ungrounded through the duplexer?
This has had me wondering for quite a while.
I have not tried yet, but how good is Yaesu technical service?
I understand the appeal to using only one antenna however, again, you'll be way happier with a separate 2 meter, 70cm antenna. Going to bypass a boat load of issues I've seen friends have when trying to get that all to work on their vehicles and the one that did get it to finally work, he used it exactly once on 2 meters and went back to a different antenna for that band. I can try and pin him down on exactly how he got it to work when I see him. But again, he used it once and decided when the coverage was so poor, he just went back to a dual band for 2 and 70cm.
Ghostnotes
Member
The coverage did not seem too bad although a 2m 70cm would obviously be way better.The trick seems to be that I had to manually tune if and when I dialed to a signal I saw on the spectrum....
Move the dial, then up with the antenna....nope.....down with it....yep a little better...then a little more etc.
Obviously different people have different criteria for what works well for them and what does not. We do a LOT of VHF and UHF simplex in our area, only radio to radio. I can tell you, the ATAS did not work well against almost every antenna we tried it against and that's "IF" we could even get the ATAS to work as you're finding out. Again, obviously for your needs, it might be "good enough" but it was bad enough for the guys testing them, that they said "nope". Not gonna happen. These guys use the ATAS for HF and 6 however with great results or at least pretty good given the length and it's obviously (as all mobile antenna's are) a compromise antenna.
I wish you luck, getting it to work for your application. Keep us posted on how it goes.
73
-.---.----..I'm pretty good at CW but what in the world is this? Is there perhaps some spacing missing?
Ghostnotes
Member
LoL
It's actually an If you know....you know thing.
So after reading below...if you search for the song on YouTube, it will make sense.
YYZ is the IATA airport identification code of Toronto Pearson International Airport, near Rush's hometown. The band was introduced to the rhythm as Alex Lifeson flew them into the airport. A VHF omnidirectional range system at the airport broadcasts the YYZ identifier code in Morse code. Peart said in interviews later that the rhythm stuck with them.[4] Peart and Geddy Lee have both said "It's always a happy day when YYZ appears on our luggage tags."[5]
The piece's introduction, played in a time signature of 10
8, repeatedly renders "Y-Y-Z" in Morse Code using various musical arrangements.[6][7]
"YYZ" rendered in Morse code
YYZ
- . - -- . - -- - . .
Ok so -.-- -.-- --..
Got it.
