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

   Home   Help Search  
Pages: [1] 2 3 4 5 6 ... 10 Next
 1 
 on: Today at 10:36:26 PM 
Started by K7CO - Last post by KJ4Z
Jon, I am listening on an iPhone via a site in Kentucky on globaltuners.com. I may rework it to listen via my own station if we keep the net going. I am headed south from San Francisco to Mountain View, CA on Caltrain. Expect to be home and check in around 01:15.

Do you work in SF? I work at 2nd and Howard - so if you are anywhere near - lets go to lunch or coffee sometime.

Yep, I work at 1st and Mission, so about 5 minutes away.  I'll ping you on email.

 2 
 on: Today at 10:27:29 PM 
Started by KF7OYR - Last post by N4UFO
I would recommend building a ground plane instead of a vertical dipole... that way you don't have to worry about insulating the mounting mast from ground and also having the coax shield couple with the metal conduit resulting in common mode currents that can cause RFI. If you make it a ground plane, then running the coax up through the mounting mast should not be a big deal. And if you angle the radials at about a 45 degree downward angle, you should end up with an impedance of 50 ohms as as opposed to 72 ohms with the vertical dipole.

At 10 meters, it just makes more sense... if it were a lower band, a ground plane might be practical but you might even find an old CB base antenna to trim and use.

73 es GL!

Kevin N4UFO

 3 
 on: Today at 10:27:27 PM 
Started by KD0YMC - Last post by KH2G
The mic element is the HS-6 which is 800 ohm dynamic element. I suggest meter across the leads and ensure there is continuity.
Does this match the Z requirement of the radio your trying to use it on?
Regards, Dick KH2G

 4 
 on: Today at 10:12:06 PM 
Started by ZL1BDA - Last post by ZL1BDA
 Sad
National NC-44/45 receiver AGC woes.
Well I got the NC receiver going except for one important thing!
The AGC makes NO sense at all.
I've tried it with the original 6L7 tubes and 6K7's with G3 connected to cathode
but I seem to get a VERY low DC control voltage output from the AGC system and the
detector is being overloaded on BC stations.
Now even with 1 IF stage I would expect to be getting about -5 volts on the AGC line on tune.
But although everything tunes up OK (IF set to 450 kHz) we only get about -2 volts.
Obviously this is NOT enough to drop the gain of the controlled stages enough.
I have tried experimenting with different AGC arrangements even using a diode voltage
doubler but to no avail.
Anyone else ever come across a problem like this? I've been in electronics since 1950,
but this is a new one on me. BTW I checked up on the 6L7 and it can give some very odd
results, hence the tube change, but with no result.
HELP!!!
ZL1BDA

 5 
 on: Today at 10:08:33 PM 
Started by KD0YMC - Last post by KD0YMC
Hi all,

hopefully a quick question here.  I picked up a pair of Heil headphones (PS 6) at a hamfest for cheap from an SK estate sale, figuring I could fix them with no issues.  It looks like the mic portion of the cord was cut, not sure why.  I tried to solder up a 1/8 mono jack to that wiring and couldn't get any mic sound out of it.  I removed the jack, thinking I might have wired it incorrectly.

I get sound through the phone part no problem.

Question is: am i approaching this the right way?  Could the previous owner had a problem with the mic and just cut the cord to use the phones part?  I know I am asking you to speculate...

I am a relatively new tech without a lot of electronics background, but figured replacing a 1/8 jack was in my wheelhouse. 

I am trying to get these working for a ARES event coming up.  If I can't figure out a quick fix, i will likely send them off to Heil for an overhaul.  Thanks for any suggestions/input.



 6 
 on: Today at 09:46:34 PM 
Started by KD5YVY - Last post by KD5YVY
 Me and couple buddies spotting around making contacts on 20 meters tonight, this radio hasn't gave me any problems until now.  I have a wire dipole cut for 20 meters, the built in tuner has had no problems tuning it.  To night on my third DX contact when I released the mic I noticed the meter went from RX the other station from 5/9 to 5/3, noise (audio ) altogether went way down and will no longer tune 20 meters.  I can go to 17 meters and it quickly tunes 17 but I can cut the tuner off and back on and it tunes it again where before if would immediately cut the tuner off cause it was previously tuned.

If I let the tuner tune on 17 meters then click back to 20 meters I can RX the other station 5/9 again but just a very quick click on the mic cause the audio and RX to drop to bottom again.

Question is should I be looking at a major malfunction in the radio/tuner/or antenna.  Being that it was working fine when I started making contacts tonight then suddenly developed this issue I'm afraid it sounds like a radio/tuner problem, but I'm here crossing my fingers that It might be a non major possibly easy fix.

Thanks for any suggestions in advance, 73's

Brett
KD5YVY   

 7 
 on: Today at 09:45:51 PM 
Started by KK4RXN - Last post by KA4POL
The other end of the ground wire goes to a common block that all my equipment ground wires go to, which runs to a thick copper wire that runs out to an 8' ground rod buried in the ground right outside my house.
Just to be safe, measure the voltage (AC and DC) between that ground and the bolt you hooked it up to.

 8 
 on: Today at 09:36:07 PM 
Started by KF7OYR - Last post by KF7OYR
I am looking to build / experiment with a 10 meter vertical dipole using some things found around the house.  Here's what I came up with.  I will take a 108" stainless steel whip, attach it to a stud mount / mirror mount (CB style), and clamp it onto a 108" piece of 1/2" conduit.  The whip will be the center feed of the coax, the conduit would attach to the shielding of the coax.  Here's my dilemma - at the base of the conduit, I would like to fasten it to a piece of rounded UHMW (Very Dense Plastic) that would mount to the roof, insulating the conduit / antenna from the mount point (roof).  Can I run the coax cable from center feed through the conduit, popping it out towards the base by the UHMW and have the antenna effectively radiate as a vertical dipole?  Basically, is there any harm in running your coax within part of the antenna (in this case, the counterpoise)?  Thoughts?

Aaron

K7AWG - (formally KF7OYR)

 9 
 on: Today at 09:11:49 PM 
Started by K9EEH - Last post by KG4RUL
Same thing with my computer and WIN7 Pro, no problems

 10 
 on: Today at 09:09:27 PM 
Started by K7CO - Last post by KY6R
Jon, I am listening on an iPhone via a site in Kentucky on globaltuners.com. I may rework it to listen via my own station if we keep the net going. I am headed south from San Francisco to Mountain View, CA on Caltrain. Expect to be home and check in around 01:15.

Do you work in SF? I work at 2nd and Howard - so if you are anywhere near - lets go to lunch or coffee sometime.

Pages: [1] 2 3 4 5 6 ... 10 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!