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K2 Transmitted Phase Noise?

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Kenneth Silverman

K2 Transmitted Phase Noise?

Do K2/100's have a known transmitted phase noise issue? I looked at the reflector archives, and there was some comment by K6SE (SK) in 2005 that seemed to indicate there was, but the scenario seemed rather specific.

Last year as C6ATA I ran in-band SO2R on 40m using a K2/100 (s/n 2773) and a TS-850. Both were low power. The antennas were verticals on the beach, and a dipole about 400' away. When transmitting on the TS-850, I could listen to the weakest of stations on the K2 within 2 kc of the TS-850's freq. Though when transmitting on the K2, there was wide-band noise on the TS-850, covering up a layer or two of signals. It didnt matter which rig was using which antenna, the results were the same. I tend to think this was a TX phase noise issue, and not a more robust RX in the K2.

Can anyone shed some light? If this is an issue, is there any resolve?

Many thanks, Kenny K2KW

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Jim Brown-10

Re: K2 Transmitted Phase Noise?

On Sun, 5 Oct 2008 10:52:35 -0400, Kenneth Silverman wrote:

>Do K2/100's have a known transmitted phase noise issue?

YES! When I moved from Chicago to Santa Cruz, I was using it as my
primary CW contesting rig, driving a Ten Tec Titan amp. K6XX and
W0YK lost no time informing me that I was broad. Switched to the
TS850 and they were happy. I later learned that W0YK switched away
from a K2/100 for the same reason.

73,

Jim K9YC

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Ed Muns, W0YK

RE: K2 Transmitted Phase Noise?

In reply to this post by Kenneth Silverman

Yes and no. The transmitted phase noise on the K2/100 is well within FCC regs. However, when driving a 1.5 KW linear in close proximity (few miles line-of-sight) to other contesters, it was bothersome for weak signal reception. That was the primary reason I abandoned the K2/100 for SO2R and contesting (at home) in general. As you know, it has an excellent receiver and handles DX and contest expedition pile-ups excellently. It just isn't friendly with other close-by receivers when running > QRP. It should be fine if you do another QRP contest expedition. ;>)

73,

Ed - W0YK

From: [hidden email] [mailto:[hidden email]] On Behalf Of Kenneth Silverman
Sent: Sunday, 05 October, 2008 07:53
To: [hidden email]
Subject: [Elecraft] K2 Transmitted Phase Noise?

Do K2/100's have a known transmitted phase noise issue? I looked at the reflector archives, and there was some comment by K6SE (SK) in 2005 that seemed to indicate there was, but the scenario seemed rather specific.

Last year as C6ATA I ran in-band SO2R on 40m using a K2/100 (s/n 2773) and a TS-850. Both were low power. The antennas were verticals on the beach, and a dipole about 400' away. When transmitting on the TS-850, I could listen to the weakest of stations on the K2 within 2 kc of the TS-850's freq. Though when transmitting on the K2, there was wide-band noise on the TS-850, covering up a layer or two of signals. It didnt matter which rig was using which antenna, the results were the same. I tend to think this was a TX phase noise issue, and not a more robust RX in the K2.

Can anyone shed some light? If this is an issue, is there any resolve?

Many thanks, Kenny K2KW

Torsten Clay

Re: K2 Transmitted Phase Noise?

In reply to this post by Kenneth Silverman

Kenneth Silverman wrote

Do K2/100's have a known transmitted phase noise issue? I looked at the
reflector archives, and there was some comment by K6SE (SK) in 2005 that
seemed to indicate there was, but the scenario seemed rather specific.

I used a pair of K2/100's as a SO2R pair for 5 years. I never felt that TX phase noise was a limitation for me. I could listen quite well on other bands except near the harmonics of the transmitter. This is at either 100W or 1500W level. I have ICE bandpass filters and stubs and most of my antennas have reasonable isolation.

Tor
N4OGW