To: | "Michael Tope" <W4EF@dellroy.com> |
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Subject: | Re: [Amps] 10dB and propagation |
From: | R.Measures <r@somis.org> |
Date: | Mon, 7 Feb 2005 09:13:12 -0800 |
List-post: | <mailto:amps@contesting.com> |
On Feb 6, 2005, at 6:09 PM, Michael Tope wrote: You stole my thunder, Ian. Yuri and Rich seem to be agreeing with each other about two totally different things. What Rich was talking about is path loss that varies as a function of EIRP. In my opinion, this is a very questionable thesis given the amount of power involved (even 10dB above the legal limit in the US is a drop in the bucket - remember we are talking about microwatts/meter^2 whereas the old sol is in range of KW's/meter^2). Mike -- Which is why I was originally skeptical. However, the Stanford Research Institute's ionospheric project used 8171 amplifiers. Yuri seems to be making the claim that path loss can be a highly variable function of location, antenna height, frequency, local terrain, the ionosphere, the neutral atmosphere, etc. I certainly hope nobody is disputing that. If they are then they haven't been on the air very much :):) The time constant was long and was seemingly related to sun angle and serendippity.
Numerous On-Off sequences comparing the signal change with On-Off sequences from others on the group who were using 10db gain amplifiers.
The V-gain was x 10.
Not likely because the mains-V was 240v +/- 5% at both sites and no change had been made in the anode or screen supplies. I measured 1200V-pk output into 50-ohms (14kW), and my guess is that adding 3db (28kW) was not do-able short of going to an 8281 (4cx15.....), a more capable anode supply, and most likely a 200a mains service.
Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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