[Amps] Ampleon BLF189XR 1900W LDMOS transistor

[Roger (K8RI)]

The bandwidth needs to allow for clean AM, so it needs to be the same 
for all modes including digital and slow scan. 6 KHz would give us some 
speed on digital!
Like Jim said, Imagine the contesters on a contest weekend.

73

Roger (K8RI)


On 10/25/2016 Tuesday 1:16 PM, Jim Thomson wrote:
> Date: Thu, 20 Oct 2016 08:47:03 -0400
> From: "Paul Christensen" <w9ac at arrl.net>
> To: <amps at contesting.com>
> Subject: Re: [Amps] Ampleon BLF189XR 1900W LDMOS transistor
>
>> "It's about time the FCC imposed  2.8 KHz bandwidth limitation with a
> requirement that *all* products outside the required bandwidth be suppressed
> by at least 30 dB (preferably 40 dB) plus 10*log(PEP/100) above 100 W "
>
> That would preclude use of most legacy gear we've been using for a long
> time.  It would be an enviable goal for new product, however.
>
> Although I'm not a fan of bandwidth regulation, Canada created a
> well-thought bandwidth plan that allows for variable bandwidth by band of
> operation.  For example, their RBR-4 regulation (previously RIC-2) sets a
> maximum bandwidth on 80m/40m of 6 kHz, independent of mode, followed by the
> following restriction:  "The bandwidth of a signal shall be determined by
> measuring the frequency band occupied by that signal at a level that is
> 26?dB below the maximum amplitude of that signal."  On the 30m, the maximum
> bandwidth is 1 kHz.
>
> Today, we can achieve much better than -26 dBc.  However, if the U.S.
> imposes a strict bandwidth on "all emission products" for voice, then
> arguably, we need a coordinated effort with Canada and many other "strong
> signal" countries to follow.  For example, here on the east coast, there are
> times when Canadian and EU stations are stronger than many U.S. stations on
> 20m -- and greater in number.  During those conditions, a U.S. bandwidth
> limit may only be of moderate help, especially when strong, non-U.S.
> stations exceed a 2.8 kHz voice bandwidth.
>
> Paul, W9AC
>
> ##  Not gonna happen anytime soon.  Ill enjoy my 6 khz bw on all hf bands thank you very much.
> Folks up here who operate AM, are also only allowed 6 khz BW.   Thats why they have the 6 khz rule.
> On AM, that means CXR and both usb and lsb.   You need a bare minimum of 3 khz audio, so the total
> RF BW now becomes 6 khz.... IE:  3 up and 3 down.    If 6 khz AM is ok, then so is 6 khz SSB.
>
> ##  Worry more about 10,000  brain dead contesters on the weekends.   If you use  2.8 khz or less
> BW  on ssb, then you are back to using phonetics all the time.   Since I started using essb back in 2001,
> I have never used phonetics, even on noisy low bands.   You require more PO when using narrow  2.8 khz
> ssb.   I have already run these various tests  hundreds of times.  Intelligibility drops way off with narrow ssb bw.
>
> ## We are only allowed  750w po on CW mode, so we are down 3 db from our friends to the south of us.
> But its all semantics anyway, since trying to enforce a BW rule is  next to impossible.   Esp when the typ
> ham  bozo  adds his  RX BW  to my TX BW, to try and obtain total BW.
>
> Jim  VE7RF
>
>
>
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