During the time I owned it, I drove my Swan MK II with Johnson Rangers,
a Kenwood TS-530SP (6146's), a Kenwood TS-450S/AT, a Yaesu FT-900AT, an
FT-1000D, and a few other miscellaneous cats and dogs. It never once
hicupped, nor did any of the above rigs have any problem driving it.
Having been exposed to a few later model fancier amps since then I wish
I had the MK II back. I suppose it's worth noting that all the solid
state rigs had built-in tuners, all of which handled the input of the MK
II just fine. Of course, the Rangers and the TS-530SP didn't much give a
rip what they transmitted into, they just tuned up and worked. :)
73, Jerry W5KP
MIKE DURKIN wrote:
> I didnt know the Swan Mark II didn't have an input matching network, my only
> experience is with the SB220 and HL2k witch do have input networks. If its
> not needed, then is it to help keep harmonic transmition down while the input
> impeadence is not close to 50ohms?? I havea yokogawa P9306UL medical liner
> that has grounded grid 3-500z's - are you saying that i can remove the input
> network?? I have a FT-450AT that i would like to use with it.
>
>
> Date: Sun, 14 Dec 2008 07:49:31 -0500
> Subject: Re: [Amps] Input impedance of pair 3-500z's in GG
> To: patriot121@msn.com
>
>
>
>
>
>
>
>
>
> In a message dated 12/13/2008 8:12:32 P.M. Eastern Standard Time,
> patriot121@msn.com writes:
> Yes,
> but dosn't the impedance vary wildly throughout the AC wave form??
> Isnt
> that why the input circuitry is there ... because a solid state transceiver
> cant handle the changes....
>
>
> Yes that is true, but one can notice that an amplifier such as a Swan Mark
> II which has no input matching network can be used with a radio such as a
> Yeasu FT-847 with fairly good success. For 2 reasons, one is that the 847
> does not fold back on swr as quickly as most other radios ESPECIALLY ICOM'S
> and
> two, since the input of the pair of 3-500's is close to 50 ohms the radio is
> happy. Even at 85 ohms, the SWR is still tolerable. But as we know
> there are other reasons why tuned input circuits are advisable. In
> developing a tuned input circuit, using a fixed resistance as a load to
> develop
> the circuit is an approximation, final adjustment will have to be made by
> actually adjusting the input circuit as the amp is being
> driven.
>
>
> Make your life easier with all your friends, email, and favorite sites in one
> place. Try it now.
> _________________________________________________________________
> Send e-mail faster without improving your typing skills.
> http://windowslive.com/Explore/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_speed_122008
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|