I suspect the issue with the Icom preamps and a TS-2000 is that the Icom preamp does not appear to RF-sense.. if there's DC on the coax, it's in line, if there's not DC on the coax, it's bypassed. I run the SSB SP-2000 and it can handle 200 watts RF-sensed. No sequencer necessary with the rig barefoot.
The box you referenced on eBay protects the TS-2000 from amplifiers that need a lot of current from the radio to switch them, or have high voltage levels in the switching circuit ( bad design )
I did find this link which had a lot of useful info:
http://forums.qrz.com/showthread.php?287072-ICOM-AG-25-amp-TS-2000-Questions
On 8/24/2012 12:15 PM, Lawn, Richard wrote:
I have an icom preamp and wish I didn't. I'll send you the eBay link separately. Rick
This link is very useful and one I didn't find when I searched. It seems that with the particular preamp and xcvr I have a sequencer is needed to ensure dx is removed from the coax before rf is introduced. I think the easiest solution is to get a different preamp once I get my icom repaired. I could also swap it with the mirage I'm using at home with the 847 which I think is immune to rf or is switched. Unless you have an icom xcvr their preamps are a bad purchase. Thanks everyone. Rick W2jaz
Sent from my iPad http://RickLawn.com
On Aug 24, 2012, at 12:43 PM, "Bob DeVarney W1ICW" we1u@myfairpoint.net wrote:
I suspect the issue with the Icom preamps and a TS-2000 is that the Icom preamp does not appear to RF-sense.. if there's DC on the coax, it's in line, if there's not DC on the coax, it's bypassed. I run the SSB SP-2000 and it can handle 200 watts RF-sensed. No sequencer necessary with the rig barefoot.
The box you referenced on eBay protects the TS-2000 from amplifiers that need a lot of current from the radio to switch them, or have high voltage levels in the switching circuit ( bad design )
I did find this link which had a lot of useful info:
http://forums.qrz.com/showthread.php?287072-ICOM-AG-25-amp-TS-2000-Questions
On 8/24/2012 12:15 PM, Lawn, Richard wrote:
I have an icom preamp and wish I didn't. I'll send you the eBay link separately. Rick
I've had phenomenal success with the SSB preamps over the last 25 years. I have one for both 2 meters and 70 cm and if I had anything worth mentioning on 6 meters for an antenna I would have one there as well. Prior to that I used Landwehr.
For my EME station I am using a DB6NT receive-only, only because at the time the Deutschemark ( or Euro ) was cheap and I could get the DB6NT cheaper shipped from Germany than I could get an equivalent SSB receive only here. I have no regrets, the DB6NT is a thing of beauty as only German workmanship can make.
I see that ARR is now making an rf-switched preamp that handles some power now too, but I'd stick with the SSB if I were you, only because they will handle up to 700 watts if you sequence them; 200 RF-sensed.
On 8/24/2012 1:28 PM, Lawn, Richard wrote:
This link is very useful and one I didn't find when I searched. It seems that with the particular preamp and xcvr I have a sequencer is needed to ensure dx is removed from the coax before rf is introduced. I think the easiest solution is to get a different preamp once I get my icom repaired. I could also swap it with the mirage I'm using at home with the 847 which I think is immune to rf or is switched. Unless you have an icom xcvr their preamps are a bad purchase. Thanks everyone. Rick W2jaz
I have been using external (mast mounted) preamps for 2m and 70cm from ARR with my TS-2000 for 2 years and quite happy with their performance. These RF-switched preamps just work always and they're weather proof so virtually no maintenance is needed. Note that they can only handle maximum 160W RF, which is good enough for me. http://www.advancedreceiver.com/page10.html
Thu XV9AA
-----Original Message----- From: Bob DeVarney W1ICW [mailto:we1u@myfairpoint.net] Sent: Saturday, August 25, 2012 1:06 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Ts2000 with external preamps
I've had phenomenal success with the SSB preamps over the last 25 years. I have one for both 2 meters and 70 cm and if I had anything worth mentioning on 6 meters for an antenna I would have one there as well. Prior to that I used Landwehr.
For my EME station I am using a DB6NT receive-only, only because at the time the Deutschemark ( or Euro ) was cheap and I could get the DB6NT cheaper shipped from Germany than I could get an equivalent SSB receive only here. I have no regrets, the DB6NT is a thing of beauty as only German workmanship can make.
I see that ARR is now making an rf-switched preamp that handles some power now too, but I'd stick with the SSB if I were you, only because they will handle up to 700 watts if you sequence them; 200 RF-sensed.
On 8/24/2012 1:28 PM, Lawn, Richard wrote:
This link is very useful and one I didn't find when I searched. It seems
that with the particular preamp and xcvr I have a sequencer is needed to ensure dx is removed from the coax before rf is introduced. I think the easiest solution is to get a different preamp once I get my icom repaired. I could also swap it with the mirage I'm using at home with the 847 which I think is immune to rf or is switched. Unless you have an icom xcvr their preamps are a bad purchase.
Thanks everyone. Rick W2jaz
participants (3)
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Bob DeVarney W1ICW -
Lawn, Richard -
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