Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net



QSL Managers
     

Ham Links
     


  Home Help Search  
  Show Posts
Pages: [1] 2 3 4 5 6 ... 38 Next
1  eHam Forums / DXing / RE: Can I have a QSO with myself? on: May 21, 2013, 12:18:20 PM
It will save a couple of bucks for postage Grin But it will not count for DXCC.
2  eHam Forums / Amplifiers / RE: Tentec Titan 425 Blowing 20 Amp Fuses on: May 16, 2013, 09:34:56 AM
I notched the pcb out in the arc area. I hope that it will make it voltage tolerant now !

Going to fix the two burnt traces next.


http://img580.imageshack.us/img580/4378/dscn8780c.jpg


and I spotted a little damage here too...from an earlier time or a pcb defect.

http://img41.imageshack.us/img41/7623/dscn8781a.jpg



Mark N1UK

Mark,
That looks like it had a filter cap or 3 blow that is why the board had 3 different brands of filter caps o it from the first set of pictures. The previous owner/repairer just used what he could find to fix that problem and did not just get 8 new filter caps to do the job right. And that led to the problem you now have.
3  eHam Forums / Amplifiers / RE: A piece of Radio History and a weird little circuit to get it done! on: May 16, 2013, 09:19:36 AM
I thought Pace only made CB stuff unlike Midland and Johnson who were making Business Band but played in the CB market. 27.290 is in the CB band range me thinks that Pace made it seem to be a  Business Band amp to get around the FCC rules before they did the real crackdown on 27Mhz amps in the late 70's (Too bad they still do not). If you worked Al NH7O he would have told you if the Audio or Signal were not clean or not and if he said it was fine then it was fine.

73
Roland AH6RR
4  eHam Forums / DXing / RE: Z81X South Sudan on: May 13, 2013, 07:29:13 PM
I just wish they would not QSY to another band when the one they are on is just opening up here. They just start to get to S3-4 and then the QSY and then they are not even ESP then Angry
5  eHam Forums / Amplifiers / RE: Tentec Titan 425 Blowing 20 Amp Fuses on: May 11, 2013, 05:16:10 PM
It doesn't look to me that the lands is vaporized.  Just looks like irregular solder after the wires were un soldered.  Of course there is no reason why you can't use Dremel to scrap both lands away completely if they are vaporized and drill a hole in the traces then strip the wires and fold them back a quarter inch onto the trace and solder them good.  I did that with Rocco's and it was no problem.  But I doubt I would ever change the board when it can be easily fixed up.

You are 100% correct Lou. I would get the very small ball metal grinding tip for the Dremel tool and carefully grind out the carbon trace between the copper traces making sure all of it is gone. Then I would use a fast setting epoxy and coat the area where you ground out the carbon arc. Epoxy will adhere to fiberglass with no problems and the board will remain intact with no extra holes plus if any carbon is remaining (though there should not be any at all) the epoxy will cover it and for the most part keep it from conducting. Once that is done then you need to find what caused it in the first place. After looking at the photos it looks like where the HV from the transformer comes into the board.
6  eHam Forums / Amplifiers / RE: Tentec Titan 425 Blowing 20 Amp Fuses on: May 10, 2013, 06:41:35 PM
I am looking at caps and have got here

http://www.mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Snap-In/_/N-75hr0?P=1z0wrktZ1z0z80hZ1z0x818Z1z0vn3sZ1z0x3qcZ1z0wun0


What is the best choice out of these 3 options

Al Electrolytic
General Purpose Electrolytic
Low ESR Electrolytic


Do I need low ESR for this application?

Mark N1UK

I would get the Cornell Dubilier or the EPCOS in the General Purpose caps or if you want the low esr go for the EPCOS.
Here is a look at what Low ESR is http://www.illinoiscapacitor.com/pdf/Papers/low_ESR_fact_or_fiction.pdf

73
Roland AH6RR





7  eHam Forums / Amplifiers / RE: Tentec Titan 425 Blowing 20 Amp Fuses on: May 09, 2013, 09:30:06 AM
I wasn't quite expecting this..what is this board? It has 330uF 450V caps. Not sure what the caps are?

http://imageshack.us/a/img16/1148/dscn8743p.jpg

http://imageshack.us/a/img845/3874/dscn8744v.jpg


73 Mark N1UK

It looks like someone used 3 different filter caps. Having never worked on a TT425 but a HV Supply is a HV supply and that board looks good BUT the caps need to be the same not just in value but dimensions and manufacturer and the ones in the pictures do not.  It looks like 4 of them are the same then you have 2 pairs of completely different ones. That is where I would start I would remove all of them and the bleeder resistors and replace them with 8 of the same value and manufacturer.
Of course I would also check the Rectifier Diodes and if any of them are bad I would change them all.

Roland AH6RR
8  eHam Forums / Propagation / RE: Interesting phenomenom on: May 09, 2013, 01:22:42 AM
At that time of day or I should say night the 40M and 30M bands are getting longer so deep fades are normal. So what you are experiencing is some to very little NVIS if you were to try at say 1300-1500 hrs your time it would be all NVIS and very little QSB (fades). At 1900 there is very little D layer absorption so the signals are passing the D layer on their way to the F layer.
Here in Hawaii the 40M band is long around 1700 HST and local work can be challenging at best but working DX is no problem.
9  eHam Forums / DXing / RE: Z81X South Sudan on: May 07, 2013, 04:05:41 PM
Heck I wish they would not QSY to an another band just when they are starting to come up here like they have been doing EVERY DAY SO FAR.
10  eHam Forums / DXing / RE: So who here's going to Dayton? on: May 03, 2013, 11:06:57 AM
I have never been but I am saving up and who knows by the time I am 65 I might be able to make it. I really want to go but when your a working man it is hard after paying taxes.
11  eHam Forums / Antennas and Towers and more / RE: 368 ft. of #14 copper house wire + 100 ft. of window line + 1.5 acres of land=?? on: May 02, 2013, 05:42:24 PM
Update....I've done absolutely nothing so far! Now that it's getting warmer though, I'm starting to get the fever. I was out in the yard today looking at the trees. I have trees and branches where I could lay out a pretty good sized horizontal loop if I can figure out getting lines over the branches with one of the already mentioned suggestions. I'm not sure about putting up a vertically polarized loop. Have to look into that some more. One question about loops, vertical or horizontal.  Do they need to be a wavelength long at the lowest frequency or can they be some odd length? For instance, if I use all 368 ft. of wire, that's over a wavelength on 80 but short of one on 160.  I know the ramifications of short antennas but what about one that is overly long like for instance the 368 ft. on 80 meters?
73,
Michael, W4HIJ

Michael,

I am in the middle of building a Half Square for 80, 40 and 30 meters for my small lot I have 2 40ft trees 150 feet apart with a a north/south direction of radiation. Please read this on the Half Suqare http://rudys.typepad.com/ant/files/antenna_halfsquare_array.pdf
Mine is going up in a couple of months because I am putting the 30M up this weekend to test out first then the 40M one until fall then the 80M one will go up. A freind and me were talking about low band antennas for dx'ing and since dipole are NVIS at low hights I talked him into a Half Square he put up his 40M on Monday and he is hearing and working stations he can not hear or just in the noise on his rotatable dipole at 60ft and they are S7 to S9 on the Half Square at 50ft.
I modeled the 80M HS on 4NEC2 and the swr was 1:40:1 on the design frequency and doing a Sweep of 1MHZ to 20Mhz there are good dips for the 160M and 60M band that a tuner should handle fine. You have enough wire for the 80M Half Square. All you need is 2 trees 140 to 150 apart in the direction you need for the antenna pattern to be broadside to and 40 to 60 feet high.

Roland AH6RR
12  eHam Forums / DXing / RE: Z81X South Sudan on: May 02, 2013, 09:27:19 AM
I saw the spots but I could not hear them here Sad they had a big pile up on 20 yesterday.
13  eHam Forums / DXing / RE: So what shack upgrades are you going to make for P5? on: May 01, 2013, 11:56:08 PM
My upgrades are complete: TH-7DX at 70' and a legal-limit amp. I also have a clear take-off in both the short path and long-path directions to P5.

The only upgrade I need to do is raise the antenna another 6 to 12 inches on the roof tower P5 is to my NW and at 1400 feet and the coastline is 4.5 miles away in that direction. Talk about a low takeoff angle no 300ft tower needed here and I have a SteppIR though be it a 3 element.
14  eHam Forums / DXing / RE: VU7KV on: May 01, 2013, 07:01:57 PM
Looking at the QRZ page for VU7KV a W4VKU is in the ClubLog already Oh he worked himself Grin.
15  eHam Forums / DXing / RE: So what shack upgrades are you going to make for P5? on: May 01, 2013, 06:45:16 PM
I would seriously hope that if they were to get a license and are permitted to operate, that they will *not* go the Clublog Greenie route for this one. Due to its rarity and the chance of officials changing their minds a few days into it, I seriously believe they should (at least for the first week) limit each callsign in their logs to once per mode, period, with maybe one insurance for those stations who don't have internet access and don't want to miss out on a new one. If they're able to operate for more than say 7-10 days, then perhaps open it up for bandfills, etc.

Sure I'd love to have P5 on 9 bands and three modes, but quite frankly, given the nature of the beast, they'd make more friends everywhere by limiting Qs until the rates start to drop.

Not that I think we'll ever have to worry about such an eventuality for the foreseeable future. Please prove me wrong, of course!


I will be happy with just one band any mode for a ATNO and JA's and HL's are like shooting ducks in a pond here Grin Grin Grin.

But I will not hold my breath, unless Dennis Rodman is on the team then I will know it's for sure.
Pages: [1] 2 3 4 5 6 ... 38 Next
Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!