[amsat-bb] Re: Ts2000 with external preamps

Lawn, Richard RLawn at uarts.edu
Fri Aug 24 10:28:37 PDT 2012

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.

Sent from my iPad

On Aug 24, 2012, at 12:43 PM, "Bob DeVarney W1ICW" <we1u at 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

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