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Pages: Prev 1 ... 5 6 7 8 9 [10]
 on: Today at 06:46:47 AM 
Started by KB1SNJ - Last post by KB1SNJ
OK I confirmed the schematic. Wow transformers are weird you can "shunt" your signal through copper to ground as long as it goes through a winding!

Anyway here's the factors plotted through all of HF (using 3k ohm resistor as antenna)

EFHW transf w 3k resistor by Chris P, on Flickr

 on: Today at 06:31:20 AM 
Started by IK0OZD - Last post by VA3VF
Cool. Can you post a screenshot?  I'm not going to burden them or me with Yet Another Signon just to see what it looks like.  Be nice to see it first.

Hi Larry,

Not sure if the request was directed at me, about I would be happy to post screenshots, but just cannot make it work. As for yet another signon, I know the feeling, but this one is callsign and password only.

Hopefully another reader, more proficient with eHam, can post the screenshots. But as I said before, no graphics, table display only, but with different options. One screenshot is not enough.

73 de Vince, VA3VF

 on: Today at 06:08:07 AM 
Started by WU3D - Last post by WU3D
Can I replace the 12AX7 tube with a Electro Harmonix 12AX7 EH tube ?

 on: Today at 05:49:01 AM 
Started by KM1H - Last post by KB4MNG
The problem with the old flagship rigs is as the new model comes out the old one just doesn't bring the used dollar value any more, a good clean 7800 I have seen from just over $2.6k t0 $3k in today's market, before the 7851 was out the hi end was around $4k but then you still are looking at shipping that beast and thats an easy $150-$200 more. The shame of it is they have radio's out now that sell for $1300 that the RX section will give the ole 7800 a run for its money. There own 7300 may not give all the features but its basic RX section is dam good. The problem with the 7800 is for today's hams to justify its price but it is a very smooth radio to operate.

It's also out there that the FT 891 rx is better than the 7300s, thats a $500 radio new Embarrassed

 on: Today at 05:47:13 AM 
Started by KC8KTN - Last post by KB4MNG
You really need to consider the 7600. Screaming deal right now on those......

 on: Today at 05:45:49 AM 
Started by KF0QS - Last post by KB4MNG
My Yaesu and Kenwood hybrids, assorted solid state transceivers, receivers and scanners in the shack run 24x7 and have done so for years. I do lots of monitoring.

The only time they're powered off is when I'm going to be away for more than a few hours or there's an electrical storm in the area.

Everything which can be run off 12v is, courtesy of a big Astron.

You run your hybrids 24/7? Does not look like that would be good for them, do you every have problems?

I think SS stuff is fine to run, if it has a tube, your hurting your tube life if that matters to you.
I have read several times that it is not good to leave a tube amp on for long spans of time. If you are going to go over 30 mins of not using it, cut it off and back on ...

 on: Today at 05:38:14 AM 
Started by KF0QS - Last post by AA4PB
My gear (all solid state) runs from my first use of the day until my last use at night. My experience with many years in the electronics profession is that gear (especially power supplies) tend to fail when they are first turned on. Capacitors don't prevent inrush current, they are one of the causes. When you first turn the power supply on, all those big, discharged, filter capacitors suddenly get hit with voltage and draw a big spike of current until they are charged.

I include the computer in this daily cycle because I find it to be more reliable if it gets a fresh boot once a day (except for the 1st of the month when it does a complete backup at 1AM.).

The other thing to consider is electro-mechanical devices such as fans and hard drives. Shutting down at night reduces their usage to 50%.

 on: Today at 05:35:20 AM 
Started by VK5EEE - Last post by K3STX
I have two radios with VFOs (Kenwood TS-590S and Drake 4 line), but I rarely use them. I use the Kenwood for DXing cuz I still like the 5NN TU contacts with DXpeditions. I think I read that you don't like DXing like that, that is fine. To each his own.

My main radio is a homebrew MOPA, 50 watts out. I have crystals for 3550, 3535, 7028, 7035, 7056, and 7058. That's it. I thought the "designated" QRP frequency was 7040.

And yes, a DXpedition can park wherever they want (legally) and call CQ. They can say "up" till they are blue in the face, but it is MY responsibility as a caller not to QRM your QSO that happens to be in the "up" range. I just don't accept the premise that certain frequencies should be "reserved". But let's get real, most DXpeditions transmit at the low edge of the band, far from the middle QRP "region" of the band.

When I want to play on my radio if there are ongoing QSOs on the frequency of all of my crystals I turn off the radio and do something else. I could turn on my Drake and use the VFO, at this stage of my life I just chose not to use a VFO.

I don't understand the "new sport" you suggest I created. Why would people call CQ 1 kc below an ongoing QSO and then call UP? Lets say the "reserved" frequency for QRP is 7040 kc. If there is an ongoing QSO on 7040 it would not be very nice for DXpedition to call CQ on 7039 kc. Surely the pile-up will inpinge on the QSO. But if there is not QSO on 7039 or 7040 (after asking ask QRL?) then transmit on 7039 and GO. I don't see the problem.

Other than the fact that you seem to think 7040 should be "reserved" for a QRP op who MIGHT want to come on that frequency later and call CQ.


 on: Today at 04:43:15 AM 
Started by VK5EEE - Last post by G4LNA
The other two HF frequencies on 4583, 7646 appear to be working, can't hear the VHF one because it's out of range.

 on: Today at 04:40:15 AM 
Started by VK5EEE - Last post by G4LNA
I can hear it on 30M, the transmitter is probably busted, or the computer that drives it.

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