开云体育

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Ldgelectronics
  2. Topics

AT-1000 Pro II High SWR

Terry Y
 

Hi Everyone,

I have a antenna, a Chameleon EMCOMM II, that I am trying to install and I'm not having any success.

I have an Icom IC-7000, with a built in Tuner/Call function, but I currently do not have the LDG IC-PAC cable to utilize the internal tune function of the IC-7000 so I am manually tuning the system with the Tune button on the AT-1000.

I have the AT-1000 user manual open and I am following the instructions when II try to tune the system.? I hold the Tune button for a three-second count, then I disconnect the antenna coax and connect my antenna analyzer and it gives me a reading of infinite (∞).? I get the same ∞ reading if I disconnect the coax from the back of the IC-7000 or from the AT-1000 Ant-1 connectors.

If I have my radio system shut down and disconnect coax the AT-1000 Ant-1; I get a reading of 3.47:1.? Is the 3.47 too high a starting point for the AT-1000 to work with?? I am trying to make this work with a Chameleon EMCOMM II long wire antenna, which is new and the first long wire antenna I have ever worked with.

Any thoughts on what my problem might be or where I might look to fix this issue?


Thanks,
Terry, n0ve
 

Terry,

Are you also keying the 7000 in AM or RTTY mode with reduced power? The tuner needs RF in order to tune. You should hear relays chattering as it does.

I have a 7300 here with an AT-100 and would strongly recommend getting the cable. It makes life much easier.

Steve, AI3KS
Terry Y
 

Hi Steve,

I'm keying the mic in USB and LSB modes (14.270 & 7.240)? My IC-7000 is set at 80% power.?

I have ordered the IC-PAC cable; it is suppose to be delivered on Tuesday.? In my area USPS hasn't been real reliable in meeting their expected delivery dates.


Thanks,
Terry, n0ve
 

What do the instructions for the AT-1000 ProII say to do, pretty sure the unit
needs a steady carrier to tune, at least mine does.
That means not to use side band.

John
VE3KKQ

---------- Original Message ----------
From: Terry Y <tkyoung2009@...>
Date: May 31, 2020 at 3:32 PM


Hi Steve,

I'm keying the mic in USB and LSB modes (14.270 & 7.240)? My IC-7000 is set at
80% power.

I have ordered the IC-PAC cable; it is suppose to be delivered on Tuesday.? In
my area USPS hasn't been real reliable in meeting their expected delivery
dates.

Thanks,
Terry, n0ve
 

Terry,

You cannot use USB or LSB as there is no RF unless you are speaking and then it is not steady. Try again using AM,

Steve, AI3KS
 

开云体育

Hi Terry,

?

I presume you did read the manual.

?

The manual states you can use AM CW or USB but must modulate for voice.

?

Also states run LOW power as when you first start tuning you may get a high SWR and your radio may shut down if too high.

?

With a Yaesu the tune button puts the radio into CW at 20W.

?

Cheers

Neil (VK5ZEE)

?

From: [email protected] <[email protected]> On Behalf Of AI3KS
Sent: Monday, 1 June 2020 07:08
To: [email protected]
Subject: Re: [ldgelectronics] AT-1000 Pro II High SWR

?

Terry,

You cannot use USB or LSB as there is no RF unless you are speaking and then it is not steady. Try again using AM,

Steve, AI3KS

 

I use the interface cable but for fine adjust I use RTTY reducing the power to 10watts aprox and ptt-ing with the mic.
Terry Y
 

To All Who Have Replied,

Thank you.? Yes, I have the manual and I have it printed for easy reference.? And, I am using it.

My version of the manual does say if one is not using the optional radio interface cable (I am not.) "... key the radio (Talk into the mic on SSB or AM, close the key on CW) until the tuning cycle is complete." (p.15)? I am constantly talking into the mic either repeating "tuning" or counting until the display indicates the tuning cycle is complete.? I do not see any information in my manual that restricts the tuning process to just USB, just LSB, or RTTY.?? In my manual, I do not see RTTY as an option during manual tuning.

My manual also says reduce power to 25 watts or less, except "In no case should you transmit more than 150 watts during tuning." (p. 15)? Maybe, it sounds like some of you with more experience with this tuner, than I have, are suggesting I should disregard this statement to not exceed 150 watts.

Thanks again,
Terry, n0ve
 

Hi,

I'd like to add one thing. If you're using an amplifier turn off the Auto Tune feature. This will not allow the tuner to automatically tune at whatever power the amp is putting out.

Mike KD9CK

On Monday, June 1, 2020, 11:55:13 PM CDT, Terry Y <tkyoung2009@...> wrote:


To All Who Have Replied,

Thank you.? Yes, I have the manual and I have it printed for easy reference.? And, I am using it.

My version of the manual does say if one is not using the optional radio interface cable (I am not.) "... key the radio (Talk into the mic on SSB or AM, close the key on CW) until the tuning cycle is complete." (p.15)? I am constantly talking into the mic either repeating "tuning" or counting until the display indicates the tuning cycle is complete.? I do not see any information in my manual that restricts the tuning process to just USB, just LSB, or RTTY.?? In my manual, I do not see RTTY as an option during manual tuning.

My manual also says reduce power to 25 watts or less, except "In no case should you transmit more than 150 watts during tuning." (p. 15)? Maybe, it sounds like some of you with more experience with this tuner, than I have, are suggesting I should disregard this statement to not exceed 150 watts.

Thanks again,
Terry, n0ve

Terry Y
 

Hi Mike,

Thanks for the hint; I'm not using an amphlifier in my current set up.

Late yesterday I received the radio interface cable (IC PAC) & an extra coax cable. ?Today, I created a coax balun (21 feet wrapped around a 4" PVC pipe). ?After installing the balun & the radio interface cable, the tuner now tunes and I get SWR readings of 1.42:1 on 7.240 and 2.1:1 on 14.270. ?I'd like to get the 2.1 reading down, so I'll keep working on it.


Thanks,
Terry, n0ve
 

Hi Terry,
I think you mush setup the threshold to the desired máximum swr. You can check the procedure at page 12 of the manual.
Regards
Pedro
Barcelona
 

开云体育

Terry,

?

Not familiar with that Chameleon EMCOMM II, antenna had a look around and people seem happy with it.

?

Did not find anyone saying they added a choke to improve the antenna.

?

Have you tried it without the choke?

?

Cheers

Neil VK5ZEE

?

?

?

From: [email protected] <[email protected]> On Behalf Of Terry Y
Sent: Wednesday, 3 June 2020 12:23
To: [email protected]
Subject: Re: [ldgelectronics] AT-1000 Pro II High SWR

?

Hi Mike,

Thanks for the hint; I'm not using an amphlifier in my current set up.

Late yesterday I received the radio interface cable (IC PAC) & an extra coax cable. ?Today, I created a coax balun (21 feet wrapped around a 4" PVC pipe). ?After installing the balun & the radio interface cable, the tuner now tunes and I get SWR readings of 1.42:1 on 7.240 and 2.1:1 on 14.270. ?I'd like to get the 2.1 reading down, so I'll keep working on it.


Thanks,
Terry, n0ve

Terry Y
 

Hi Pedro,

Good thought; thank you, I had not thought about changing the set value.

My SWR threshold is set at 1.7 and I cannot change it.? When I try, the 1.7 light flashes but it does not change.

Regards,
Terry, n0ve
 

开云体育

Well if it’s like my AT100, while transmitting a carrier, you can hold down the tune button for a few seconds and let go and it will try to get a better match and because of it’s memory, it will use that match again on that same frequency +/- a little.

?

From: <[email protected]> on behalf of Terry Y <tkyoung2009@...>
Reply-To: <[email protected]>
Date: Wednesday, June 3, 2020 at 11:46 AM
To: <[email protected]>
Subject: Re: [ldgelectronics] AT-1000 Pro II High SWR

?

Hi Pedro,

Good thought; thank you, I had not thought about changing the set value.

My SWR threshold is set at 1.7 and I cannot change it.? When I try, the 1.7 light flashes but it does not change.

Regards,
Terry, n0ve

 

开云体育

Terry,

According to the online user manual (on page 12) the lowest the threshold can be set is 1.7.

Steve, AI3KS

On 20/06/03 11:23, Terry Y wrote:

Hi Pedro,

Good thought; thank you, I had not thought about changing the set value.

My SWR threshold is set at 1.7 and I cannot change it.? When I try, the 1.7 light flashes but it does not change.

Regards,
Terry, n0ve

 
Edited

Yes, it's thue,
But, afterautomatic tune you can manually adjut at best swr value it and store it. I do this procedure with my at100proii when i need it.
That's not possible with the at1000??
 

开云体育

Pedro,

Yes.?? I do the same when using my AT-600Pro as well as my Z-11ProII

73,
Ed - ad7gr

Yes, it's thue,
But, afterautomatic tune you can manually adjut at best swr value it and store it. I do this procedure with my at100proii when i need it.
That's not possible with the at1000??


  


					


				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



			
		
			
				
	

		
			

			
			

			
			
			

				

					


						
							

								
								
							

						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				









开云体育






The reason this is happening is probably in the way the EFHW antenna is operating.? Many end fed antennas use the coax feeding the antenna as a form of a counterpoise.? Your antenna analyzer did not see this because it is using very low
 power, and thus unlikely to see big reflections on the coax.? The tuner sees high reflections because of higher power.? I do not think this indicates any fault with the tuner, just a need to better understand the antenna matching.


Some users report good results by shortening or lengthening your coax which feed the antenna.? Others report doing what you did, which is creating a common mode choke with coax.? You could also look into experimenting with a balun or ferrite
 based common mode choke.


?


Hope This Helps,


David


W0IM._,_._,_








				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



			
		
			
				
	

		
			

			
			

			
			
			

				

					


						
							
								
								
									Terry Y
								
							
						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				
Hi David,

Thanks for the explanation; although I don't fully understand it.? The antenna may be using the coax as a counterpoise, I don't know, however, I do have a 50' counterpoise attached to the counterpoise connection point on the bottom of the manufacturer's matching box.

What I don't have is the counterpoise run directly under the wire of the antenna, if that makes any difference.


Regards,
Terry, n0ve

				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



			
		
			
				
	

		
			

			
			

			
			
			

				

					


						
							
								
								
									Terry Y
								
							
						
					

					

						
							


						
						 
						
							
							
						
						
					

				

			

			

			

				
Steve,

I agree, that's what the manual says.? I've asked LDG Tech Support about why my unit will not allow me to change the threshold setting and they effectively just shrugged their shoulders.? I suppose I could sent the unit back to them for repair, with would take them six to eight weeks - ugh.? 

Do you have any suggestions on how to get the unit to respond to the requested value change?? Also, I've looked through the user manual to see if there is a way to reset the unit to factory defaults; I don't see one.? Are you aware if we end-users have a way to do that?


Thanks,
Terry, n0ve

				
				
				
			

			
			

	

	
			

			

				
					

				
				
			

			

				

					

				

			

			
			
			

			


				
	



			
		
	

	
	
	
	


	

		
		
		
		
		
	

	

		
		
		
		
		
	

	
	

		
		
		
		
	



	

		
		
		
		
		
		
	

	

	

		

	

		

			
	
		

			
				1 - 20 of 23