[Amps] Titan 425: High SWR on 28 MHZ

[rlm]

On Wednesday, October 15, 2003, at 03:22  AM, John Bohnovic wrote:

> At 09:58 AM 10/14/03, rlm wrote:
>> •  The 10m tuned input of the Titan 425 needs to be reworked to raise 
>> the Q (from around 0.6 to around 2) if it driven with other than a 
>> Ten Tec radio.  Another solution is to use a tuner after the radio.
>
> Rich,
>
> What is so different about TenTec radios?

•  Ten-Tec's Chebyshev output filter apparently exhibits some Xc.  To 
compensate for this, a 50pF tuned input C-in is used.  Normally, c. 
200pF is used for C-in of a 10m g-g tuned input.


> I've never had a problem driving any amplifier with my TenTecs. Are 
> you suggesting that TenTec designed the Titan 425 to work with only 
> TenTec radios? (If they did they sure would be placing a limit on the 
> sales of the amp.)

•  A tuner semi-fixes the problem.  There are no perfect amplifiers.

>
> How does the Q affect the SWR in this case? Did he report that the SWR 
> was acceptable in one part of the band and not the other?

•  No

> His choice of words "most of the time" leaves me wondering what he 
> means by that.
>
> 73..de John/K4WJ
>
>
>
Rich Measures, AG6K, 805.386.3734.  www.somis.org/