Copper Talk » Ask The Tech » Meters » A question regarding Meters « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Crackerjack
Intermediate Member
Username: Crackerjack

Post Number: 386
Registered: 7-2004
Posted on Friday, April 29, 2005 - 10:00 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Dosy Meters (some) have a phone jack for monitoring signal modulation.

1. Do they work?

2. Had I one, could I monitor microphone adjustments for proper/max/over driving and squeal, stuff like that?

In the military, we used a receiver and a spectrum analyser to accomplish max/proper adjustments off-the-air.

If you have a monitor method -please "weigh in".
Top of pagePrevious messageNext messageBottom of page Link to this message

2600
Advanced Member
Username: 2600

Post Number: 555
Registered: 7-2002


Posted on Friday, April 29, 2005 - 3:05 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

A radio on the same channel.

The 'headphone' tap-off is better than nothing, but won't sound the same as a receiver tuned to the same signal.

The headphone-jack trick is better than nothing, but you'll find that when you turn down your AM carrier, the modulation volume falls off.

Listen to the same radio/amp on another receiver, and you'll hear the mike gain 'appear' to come UP as the carrier is turned DOWN.

Discovering that little flaw was enough to convince me that I wasn't going to hear the same thing on the headphone jack that they'll be hearing "out there".

Like I said, better than nothing, but not ideal.

73


Top of pagePrevious messageNext messageBottom of page Link to this message

Crackerjack
Intermediate Member
Username: Crackerjack

Post Number: 389
Registered: 7-2004
Posted on Friday, April 29, 2005 - 4:53 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

2600:

I was thinking that this would be a good idea, aa cheap radio with a dummy load for an antenna should work, wouldn't you think?

That would give me AM reception but not SSB, as I don't think I want to buy another SSB radio for test equipment. Although it would be cheaper than a spectrum analyser. LOL...

I am thinking that AM reception is good enough? Or does that constitute the same result as using the meter phones?
Top of pagePrevious messageNext messageBottom of page Link to this message

Crackerjack
Intermediate Member
Username: Crackerjack

Post Number: 442
Registered: 7-2004
Posted on Monday, May 09, 2005 - 3:52 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

2600..

I got a used xl-510 and put a little screw on dummy load on it, and earphones.

I turned the Magnum 257 RF powrr all the way down -it worked like a champ.

I set the desk mic levels off channel that way -then went on the air and got glowing reports.

Thanks, good idea.
Top of pagePrevious messageNext messageBottom of page Link to this message

Nm1456hf
New member
Username: Nm1456hf

Post Number: 2
Registered: 2-2006
Posted on Monday, March 06, 2006 - 12:24 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Has Some one got a manual on Heathkit RF Signal Generator Model SG-7 or some helpful information on setting

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: