True. I think there's no RF alignment when replacing the finals in a
broad band PA, but there would be a need to set the idling bias for best
linearity.
Without the PA protection of circuit breaker, fast overloaded fuse, or
current limiting in the power supply all it takes for that "operator
error" is to cough after changing the radio band and before changing the
tuner. Or to have the family dog bark out the shack window at a squirrel
with the rig on SSB and the VOX enabled.
73, Jerry, K0CQ
On 11/21/2010 1:31 PM, d.e.warnick@comcast.net wrote:
>
>
> Let's put to bed the idea that mismatched loads should not be an
> issue. I have 2 Palstar tuners, an AT5K and a BT1500A. Great high
> quality products. Mismatched loads "should not" be an issue. However,
> switching to the wrong antenna, having a tuner set for a wrong band,
> a break in an antenna wire have all happened over the past few years.
> Operator error should be assumed to happen at least once in a
> lifetime. That's all it takes to wipe the finals out of one of my
> Omni VI+'s. I have 2 962 and 1 961 PS's. In every case to date of a
> cockpit error (like having the power turned up when tuning, rather
> than at 10 watts where I "thought" it was), the power supply shut
> down. I had to turn PS and rig off and on to get back on the air.
> Somehow that seems like a better alternative than replacing finals
> and retuning or realigning. It also allows me some arrogance in
> setting up a new antenna.
>
>
>
> Just my thoughts on the issue.
>
>
>
> Dave
>
> WA3F
>
>
> ----- Original Message ----- From: "Roger Rippy"<svtincup@yahoo.com>
> To: TenTec@contesting.com Sent: Sunday, November 21, 2010 8:43:02 AM
> Subject: [TenTec] Power Suppy for Omni 6& tuners
>
> At the beginning of this month, I had asked the list about tuners and
> the feedback was extremely helpful. I have been operating for the
> past several weeks with my new LDG Pro 200 and I am very pleased with
> my decision. The tuner works well with both my Omni 6 and Triton
> rigs, and it certainly has increased the ease of operation.
>
> I understand that the older TT rigs were not built with current
> protection for mismatched loads and I do have TT power supplies. My
> question is in response to Jim Brown's point about using any power
> supply. If you think or know that mismathed loads should not be an
> issue, then what is the level of risk using a linear power supply? I
> am not familiar with either an "Airpax" or an after market magnetic
> circuit breaker; but I will do the reasearch since I may need to use
> a non-TT power supply at some future date. I am under the impression
> that TT can rebuild a 961 or 962 power supply but the cost may be
> significant; therefore the linear supply option.
>
> Roger Rippy W7RIP Bozeman, Montana
>
>
>
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