just so you know the rollback is not a feature, it is an integral part of the design if the radio employs that, which all modern radios do, it would cause the entire transmitter not to operate properly or at all. Even an old tented I used bad in the day at the EOC once in a while had rollback for high swr and that radio would be over 30 years old today.
Enjoy and have a radioactive time
Michael Thurman
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On Sep 2, 2014, at 9:02 PM, Pat Byrne <[log in to unmask]> wrote:
> Mike,
> I'd go ahead and have a great time. Lived through the tube
> transmitter era and I think you are so well within spec. that you
> should be just fine.
> Enjoy.
> Pat, K9JAUAt 09:06 AM 9/2/2014, you wrote:
>> Hi all:=20
>>
>> I'm mostly an SSB op, currently running an Ameritron 811H amp, driving =
>> it with a typical 45/50W of drive.=20
>> Should I really be concerned about hurting the 102's tubes with an =
>> extended period of operating? I'm thinking of the CQWW SSB contest in =
>> October.=20
>> I played in the ARRL's International DX Phone contest back in march with =
>> no ill affects to my 102 but some of my friends have been recommending =
>> that I shouldn't do that again and I dodged a bullet.=20
>> Considering that a good set of 6146s can dissipate a combined 100W, I =
>> don't think I'm coming even remotely close to that at 45/50W in tune/CW =
>> mode, with an SWR of 1.0/1 and 0 reflected power based on my TW-1's =
>> announcements. .=20
>> After getting that 45/50W in tune mode, I switch to SSB and control the =
>> amp's output with the mic gain and ALC control. In SSB, I'm just peaking =
>> over 600W. The amp is rated at 600W CW and 800W SSB.=20
>> I'm also thinking of when this transceiver was brand new in the early =
>> 80s. Wouldn't owners spend hours operating in all capable modes at the =
>> time? Running various amps, not exactly resonant antennas and the like?=20=
>>
>> I do have a backup rig but how my 102 performed in the last contest, =
>> makes me want to use her again. The filtering was absolutely fantastic =
>> and I got outstanding audio complements, opping with a Heil Pro Micro =
>> Duel with the HC-6 element and 500/600W amp.=20
>> With a solid state rig, they employ a roll back for SWR protection but =
>> when operating for long hours can they handle the beating that tubes =
>> can? Let's say if the rollback and cooling fails, how much beating would =
>> they take?=20
>>
>>
>> 73:=20
>> Mike VO1AX=20
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