[TowerTalk] LPDA'S and single SS devices amps

[Joe Subich, W4TV]

The spec for the "single pallet" HF board (1000 W) shows the 1 dB
compression point at 500 W!  That means the "1000 W" unit will have
significant IMD above 500 W PEP and the "1500 W" amplifier will have
fairly significant IMD above 100W PEP.  Not exactly "clean".

73,

    ... Joe, W4TV


On 10/26/2013 8:41 PM, Mike Fahmie wrote:
> I looked at the CommAmps website, nowhere could I find the word 'Linear' or any IMD spec's. I'm sure that they are linear to a degree, but would sure like to see it spec'd.
> -Mike-
> WA6ZTY
>
>
>
>> ________________________________
>> From: Mike & Becca Krzystyniak <k9mk at flash.net>
>> To: 'Larry Stowell' <lclarks at nc.rr.com>; towertalk at contesting.com
>> Sent: Saturday, October 26, 2013 4:12 PM
>> Subject: Re: [TowerTalk] LPDA'S and single SS devices amps
>>
>>
>>     There is another generation of LDMOS devices that were introduced in the past year or so.
>>     Exception robustness on extreme SWR's at all phase angles.
>>     These devices are the generation of parts that will meet the needs of most users.
>>
>>     On the SSPA front, check out http://www.commamps.com/
>>
>>     Bobby in introducing a dual pallet solution on an HF-6M amp, offers like solutions at 2M and higher.  My take is it should be comparible to the Dishtronix in capability, smaller in size, and like the Dishtronix it has the ability to keep the power at 1500 watts into all phase angles (typical SWR's).
>>
>> Mike K9MK
>>
>>
>>
>> -----Original Message-----
>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Larry Stowell
>> Sent: Saturday, October 26, 2013 5:35 PM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] LPDA'S and single SS devices amps
>>
>> I have to agree with Steve my T-8 is great across the “bands” I started with a C31XR and it was good on 20 and 10 but terrible on 15 very limited bandwidth. I replaced it with a 4L Steppir with the 40m it was a great antenna worked well until Zeus intervened. The only thing was it was heavy and floppy, a lot of torque. I had a new one in hand $3500 (thanks insurance company) looked up at the tower and sold it bought the T-8 $800 half the weight and not floppy works well.
>>
>>
>> Rick I disagree with your statement. As a owner of a Tennadyne T-10 and currently a T-12 your statement is flat out wrong. I swept my T-12 with my rig expert AA-230 analyzer and it was below 2-1  across the 13-30 mhz. range. Not sure what you are talking about, OR WHAT BRAND. But to say mediocre SWR is a false statement.
>>
>> 73,
>> Steve W1DXH
>>
>>
>> Dick take a look at at  http://expertampsusa.com/ The talk about a new model 1.3K-FA using one device.
>>
>>
>> I would be curious to see how these LDMOS devices perform. Has anyone any data on the M2 boxes they sell for 6 and 2 ?
>>
>> An HF Amp, using one or two of these devices would be very interesting.
>>
>> 73, Dick, W1KSZ
>>
>>
>> 73
>> Larry K1ZW
>> Durham, NC
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