What is backswing?

[Limeybastard]

Can someone be kind enough to explain what backswing means in relation to CB radios please?

I've googled it, but thus far folks talk about it but dont say how it came about.

I found this :

http://www.worldwidedx.com/threads/back-swing.25903/

This hasnt anything to do with deadkey right? When I deadkey on lowest rf power , the watt meter swings back a little during measuring I think.

 

[Robb]

Normally, this happens when a newbie thinks he can get more talk power out of his radio and turns up the carrier so high that it starves the radio's ability to modulate due to lack of power headroom.

 

[rabbiporkchop]

It's a bad thing to put it simply.

 

[vkrules]

And sometimes you see it when the car battery is going flat, or the base psu cant provide enough amps Or you are getting rf feedback.

 

[vkrules]

Yep nasty sounding tx audio.

 

[543_Dallas]

The finals don't have enough headroom when the carrier is fully modulated so the power reading swings backwards on an average reading meter like a bird 43. Can be caused buy an under rated power supply, bad tuning or just running the carrier too high.

Swinging back a little isn't much for concern. At 100% mod the average reading meter will wiggle a bit. Some words will bump it foreword and others will make it drop slightly. If it drops significantly something is wrong. A pep meter should always swing forward. If it doesn't you have a serious issue somewhere.

If your radio is really swinging the average reading meter forward some kind of super swang mods have likely been done. NPC mods, swing kits, cap & resistor type stuff.

 

[Limeybastard]

The finals don't have enough headroom when the carrier is fully modulated so the power reading swings backwards on an average reading meter like a bird 43. Can be caused buy an under rated power supply, bad tuning or just running the carrier too high.

Swinging back a little isn't much for concern. At 100% mod the average reading meter will wiggle a bit. Some words will bump it foreword and others will make it drop slightly. If it drops significantly something is wrong. A pep meter should always swing forward. If it doesn't you have a serious issue somewhere.

If your radio is really swinging the average reading meter forward some kind of super swang mods have likely been done. NPC mods, swing kits, cap & resistor type stuff.

Thanks for your kind explanation.

Just need a video now to see .

 

[Robb]

It is counterproductive to have it swing back - at all. Means you've hit the wall and it bounced back. Sorta like having an N4 with a 250w max dead key when it should be no more than 100w. Of course these numbers are moot if one isn't using a dummy load and a decent meter to put it where it belongs by design.

A dummy load isn't expensive. Even with a mediocre meter you will be far closer than not. Kindly consider buying one if you are going to go into a radio making adjustments - the life of your radio may well depend upon it. MFJ sells a 1000w load for about $30 - well worth it.

 

[Limeybastard]

It is counterproductive to have it swing back - at all. Means you've hit the wall and it bounced back. Sorta like having an N4 with a 250w max dead key when it should be no more than 100w. Of course these numbers are moot if one isn't using a dummy load and a decent meter to put it where it belongs by design.

A dummy load isn't expensive. Even with a mediocre meter you will be far closer than not. Kindly consider buying one if you are going to go into a radio making adjustments - the life of your radio may well depend upon it. MFJ sells a 1000w load for about $30 - well worth it.

Yeah, Ill get the dummy load, cheers.

 

[binrat]

Salt water dummy load, google it.

 

[Limeybastard]

Salt water dummy load, google it.

I sure will LOLz

 

[Robb]

Salt water dummy load is OK for low power stuff; but you need accuracy and reliability of a real dummy load when using power.

Look for a used MFJ-250; you can score it for about ~$30-$40.
That will git er done.

 

[fourstringburn]

Yes, the MFJ-250 is the better one to use for high power. You can use common mineral oil instead of transformer oil to fill it. It's cheaper and doesn't smell. Any Variety store that sells pharmacy and other health supplies should sell it.

 

[Limeybastard]

Yes, the MFJ-250 is the better one to use for high power. You can use common mineral oil instead of transformer oil to fill it. It's cheaper and doesn't smell. Any Variety store that sells pharmacy and other health supplies should sell it.

Yeah. I used that oil once on a Boos block.

 

[DainBramage]

Yeah. I used that oil once on a Boos block.

Boos block?????

Dayum, ..... you 'jacked your own thread!