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 11 
 on: Today at 11:45:28 AM 
Started by KC9VZB - Last post by WX7G
Ameritron sells the HV transformers for all their amps. The smallest, for the AL-811, is $105.

 12 
 on: Today at 11:40:44 AM 
Started by VE8EV - Last post by W6GX
TL has Chris f4wbn he goes there from time to time.

9Q has a long term op, 9Q6AL.

Thanks for the tip.  9Q6AL likes the WARC bands (no resonant antenna here) and it's been mostly an EU and East Coast affair.  No luck here in hearing him good enough to call.  One of the problems with resident ops is that they have a set schedule.  If that schedule doesn't fit my schedule and/or propagation then I'm SOL.  Plus Otto hasn't been on the air since June...

I'll look into F4WBN.

ps neither Otto nor his QSL manager lists an email address.

73,
Jonathan W6GX

 13 
 on: Today at 11:40:39 AM 
Started by KG6Q - Last post by KG6Q
I sent a JT-65 CQ transmission into a dummy load and recorded the audio using DM780's audio recorder (my FT897/SignaLink setup doesn't allow easy Audacity recordings). Then I used Audacity to analyze (i.e. playback) the recorded audio in spectrum mode. A portion of the audio appears below.



If I understand JT-65's (inter-tone) 1,271 Hz synchronizing tone, it appears very close to 1,300 Hz in the image. Now I have two questions:

1. Is the image's 1,300 Hz inter-tone frequency indeed JT-65's sync frequency?
2. What is that constant 1,000 Hz tone  Huh

Thanks in advance for your replies.

 14 
 on: Today at 11:32:23 AM 
Started by VE8EV - Last post by N2RJ
then one last March and nothing since.

I worked the same station (3XY0ZA) however there's little chance of getting a QSL (or approved by ARRL).

Why no dxpeditions to TL or 9Q?  The rest of Africa have been activated umpteen times.

73,
Jonathan W6GX

TL has Chris f4wbn he goes there from time to time.

9Q has a long term op, 9Q6AL.

 15 
 on: Today at 11:29:44 AM 
Started by N3PVQ - Last post by KD8MJR
I agree that you have not done nearly enough tests.  Send your amp off now and you may end up with a big shipping bill, a inspection fee and a note saying nothing is wrong with it!
And that's best case scenario.

You need to check each piece out one by one till you know it's the amp.
Did you hook a voltmeter to the DC supply and see what happens to the voltage when you key down?

 16 
 on: Today at 11:19:42 AM 
Started by K9IUQ - Last post by KD8MJR
Yes but let's face facts the main reason they use Elecraft is because Elecraft is right now one of the big sponsors for a lot of dxpeditions.
Several years ago when Icom was doing a lot of sponsoring everyone was using Icoms.
SteppIR is also a big sponsor right now and everyone uses their antennas.

Bottom line, most expeditions will use whatever equipment they can get to use for free and therefore it's not going to be a good benchmark indicator.

 17 
 on: Today at 11:15:04 AM 
Started by AD5IW - Last post by K1ZJH
I think an 80 would be pushed in that circuit, because the reservoir capacitor is rather large. The published ratings for the 80 are for a 10 mFd reservoir. So that is probably why they went for a 5U4 - if there was a logical reason. There isn't always.....Plus the fact that the circuit suggests that there is a left hand amplifier powered from it as well

 


What is a reservoir capacitor; is that the input filter cap in an LC filter?  RCA spec'ed the tube for up to 40uF in their manuals. 10uF seems a bit small.

Pete
http://www.classiccmp.org/rtellason/tubedata/5U4-GB.PDF

 18 
 on: Today at 11:13:48 AM 
Started by K6DPF - Last post by KG6AF
Personally, I'd try to work with the Principal first - before going over his head to the school board. He and the vice-Principal probably have no clue what those radios are. You should explain that your daughters took and passed an FCC exam in order to receive a license to operate the radios. Explain what they use them for and that you feel that they should be able to use the radios anywhere that students are permitted to use their cell phones.

If you start out by going directly to the school board and win then you risk leaving your daughters having to deal with an unhappy Principal every day. It's much better if you can get the Principal to make the decision.

Thanks you for your response.
I actually have spoken with the vice principal already.

And what did the vice principal say?

 19 
 on: Today at 11:11:32 AM 
Started by WA4D - Last post by N6GND
I'm so analog I'm pre-"Elmer" and can only think in Morse code.

Before the term "Elmer" arose there were people who knew about and loved radios who wanted to share their knowledge and love with others, especially kids they knew.

Nothing is more basic to being human than sharing ideas with those who are hungry to take them in. "Elmer" or simply "uncle" or "aunt."

Little did I know that the digital mind I acquired in a couple of weeks while learning Morse back in the 1950s would become all the rage and infect the whole analog world.

Analog and digital, you can't tear 'em apart. Neither can you tear apart uncles and aunts and nieces and nephews.


 20 
 on: Today at 11:10:13 AM 
Started by IW5CI - Last post by K1ZJH
I was pretty amazed at the IF bandwidth in my restored SX-16... it beats most of the the boatanchors I own or have used when set to the broadest IF BW.

Pete

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