Re: [Elecraft] Interesting K3 QRM problem

2014-10-24 Thread Al Lorona
Al W6LX From: Al Gulseth To: elecraft@mailman.qth.net; Al Lorona Sent: Thursday, October 23, 2014 1:36 PM Subject: Re: [Elecraft] Interesting K3 QRM problem Pardon my ignorance here, but I thought a link coupled tuner would be more of a bandpass than a

Re: [Elecraft] Interesting K3 QRM problem

2014-10-24 Thread Vic Rosenthal 4X6GP/K2VCO
Yes, the solution to the problem was a highpass filter between the vertical antenna and the K3 ANT1 connector. On 24 Oct 2014 00:34, Jim Brown wrote: On 10/23/2014 1:52 PM, Joe Subich, W4TV wrote: Given Vic's description, it is likely the noise is being generated in one or more of the PIN diod

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Jim Brown
On 10/23/2014 1:52 PM, Joe Subich, W4TV wrote: Given Vic's description, it is likely the noise is being generated in one or more of the PIN diodes in the T/R switching and placing the highpass filter in the insert point will not resolve the noise. I agree. 73, Jim

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Joe Subich, W4TV
Maybe, and if you're right, my suggestion may not help. But you misunderstood my suggestion. There is an insert point between the T/R switch and the RX input. That's the RX loop I was talking about -- you insert the filter there. The insert point is *after* the PIN diode T/R switches for both

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Jim Brown
On 10/23/2014 10:36 AM, Vic Rosenthal 4X6GP/K2VCO wrote: It isn't necessary to filter the loop. What is happening is that BC RF is coming into the ANT1 connector of the K3 from the vertical, where it is mixing up with every other signal around, probably in the t/r switch section. Then the IMD p

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Al Gulseth
Pardon my ignorance here, but I thought a link coupled tuner would be more of a bandpass than a high-pass filter. CLC T-network tuners (MFJ etc.) are the ones usually associated with becoming high-pass networks if misadjusted. 73, Al On Thu October 23 2014 12:55:15 pm Al Lorona wrote: > This do

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Al Lorona
This doesn't apply in Vic's case here, but his situation reminds me of yet another benefit of using a link-coupled tuner with balanced line feeding a horizontal antenna in the center. A balanced link-coupled tuner turns out to be a high-pass filter, so while you're tuning it up on a ham band, i

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Vic Rosenthal 4X6GP/K2VCO
It isn't necessary to filter the loop. What is happening is that BC RF is coming into the ANT1 connector of the K3 from the vertical, where it is mixing up with every other signal around, probably in the t/r switch section. Then the IMD products (which are on numerous frequencies) are getting r

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Vic Rosenthal 4X6GP/K2VCO
t is based on remembering plans for a simple "free power" radio in a mag some years ago.) 73, Al - Original Message - From: "Vic Rosenthal 4X6GP/K2VCO" To: "Elecraft Reflector" Sent: Thursday, October 23, 2014 6:58 AM Subject: [Elecraft] Interesting K3 QRM p

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Jim Brown
On 10/23/2014 3:58 AM, Vic Rosenthal 4X6GP/K2VCO wrote: I have a BC band filter which is used with the MFJ antenna analyzer when there are nearby BC signals. Sure enough, putting this in series with the K3 ANT 1 connector kills the noise. Of course I can't transmit through it. Hi Vic, A few

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Al Gulseth
iginal Message - From: "Vic Rosenthal 4X6GP/K2VCO" > > > > To: "Elecraft Reflector" > > Sent: Thursday, October 23, 2014 6:58 AM > > Subject: [Elecraft] Interesting K3 QRM problem > > > >> I live about 3.3 miles from a 50 kW

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Wayne Burdick
Hi Vic, We designed a high-power, high-pass filter that should solve this problem. You can transmit through it. Your situation would be a good test of the filter, which we were considering offering as a product. Can we send you one of the prototypes? 73, Wayne N6KR On Oct 23, 2014, at 3:58

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Vic Rosenthal 4X6GP/K2VCO
uckily, when you're looking a 60Hz waveforms, we just ignored the BCI. 73, Charlie k3ICH - Original Message - From: "Vic Rosenthal 4X6GP/K2VCO" To: "Elecraft Reflector" Sent: Thursday, October 23, 2014 6:58 AM Subject: [Elecraft] Interesting K3 QRM problem I live ab

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Charlie T, K3ICH
BCI. 73, Charlie k3ICH - Original Message - From: "Vic Rosenthal 4X6GP/K2VCO" To: "Elecraft Reflector" Sent: Thursday, October 23, 2014 6:58 AM Subject: [Elecraft] Interesting K3 QRM problem I live about 3.3 miles from a 50 kW BC station on 1080 kHz. It is on 24 h

Re: [Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Arie Kleingeld PA3A
Vic, Cannot really tell what's happening, but I have a suggestion for your BC bandfilter. Connect the filter to the RX ANT in and out connectors, and switch on the RX ANT. Now you can transmit the normal way and use the filter for receive only. 73 Arie PA3A Vic Rosenthal 4X6GP/K2VCO schreef

[Elecraft] Interesting K3 QRM problem

2014-10-23 Thread Vic Rosenthal 4X6GP/K2VCO
I live about 3.3 miles from a 50 kW BC station on 1080 kHz. It is on 24 hours a day, transmitting in Arabic, not that that matters. I have two antennas: an R8 vertical and a Pixel Loop receiving loop. With either antenna, I hear a wideband noise on my K3 that is synchronized with the program m