[Moon-net] IC746 transient output spikes

[Russ K2TXB]

Hi Lance.  In addition to Leif's comments, common fix is to use a sequencer
to delay switching the solid state amp to TX until after the spike would be
over.  So the spike passes harmlessly to the tube amp.  But if there is no
tube amp, then YIKES, the spike hits the antenna and maybe the preamp.  So,
you have to make sure the antenna relay is sequenced off first, on last.
(This assumes that you are properly using the antenna relay as energized for
receive.)

73, Russ K2TXB

> -----Original Message-----
> From: moon-net-bounces at list-serv.davidv.net 
> [mailto:moon-net-bounces at list-serv.davidv.net] On Behalf Of 
> LANCE COLLISTER
> Sent: Friday, March 07, 2008 3:41 PM
> To: moon-net at list-serv.davidv.net
> Subject: [Moon-net] IC746 transient output spikes
> 
> 
> A bit off topic, perhaps, but I know others here also have these rigs.
> 
> I have an IC746, and have been pleased with it so far.  
> However, I often see RF power output spikes when I switch to 
> XMIT. This is more of a concern now, because I am planning to 
> use this with a solid state amp which cannot tolerate any 
> such excessive power input spikes.  Is there some work-around 
> for this problem that I can implement here?  I look forward 
> to any suggestions you might be able to provide.
> 
> Thanks and 73, Lance
> --
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, 
> WA1JXN/C6A, ZF2OC/ZF8) P.O. Box 73 Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11, 6m DXCC #815
> 
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