Got the RED & YELLOW

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w-u-2-o
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Joined: Fri Mar 10, 2017 1:47 pm

Re: Got the RED & YELLOW

Postby w-u-2-o » Tue Sep 05, 2017 3:35 pm

.

Now that's a thing of beauty! :D

Interesting little double cross-over at the top. What amp are you using?

I would have predicted S-ATT = 18dB with a 10dB attenuator, however 14dB is within the range that others have reported (8000's seem to vary a little bit in terms of their internal construction, nobody has a handle on this yet, even after asking Apache directly).

Two pages of thrash all because of an assembly error at the factory. :x You had everything correct from the start! At least now we'll know the symptoms if someone else asks about the same symptoms. :roll:

So how's your transmit IMD? I bet it looks very nice, now!

73!

Scott
Bill in Georgia
Posts: 51
Joined: Sun Apr 09, 2017 8:03 pm

Re: Got the RED & YELLOW

Postby Bill in Georgia » Tue Sep 05, 2017 7:14 pm

Yes it sure looks good....IMD at 250 watts, id down -85 .....
Awful lots of towel twisting to find it's a honest mistake....

But sure do want to thank you and all the guys for hanging in there...and yes a lot was learned....

Thanks A;;..and keep an eye of that monster hurricane..185 mph winds..most ever in the Atlantic...

Bill ... KC4PE
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w-u-2-o
Posts: 2273
Joined: Fri Mar 10, 2017 1:47 pm

Re: Got the RED & YELLOW

Postby w-u-2-o » Tue Sep 05, 2017 8:51 pm

What amp are you using?
Bill in Georgia
Posts: 51
Joined: Sun Apr 09, 2017 8:03 pm

Re: Got the RED & YELLOW

Postby Bill in Georgia » Wed Sep 06, 2017 5:33 pm

The amplifier is a former Alpha 78.
However the 8874's were replaced with a pair of Eimac 3CX 800's....

I released a pair of 9500's when the issue of repair/replace come to the forefront...

But the modded 78 served me well has the spot auto tuning.. runs cool at 1500 has plenty of head room....so...

-Bill

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