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| To: | <[email protected]> |
|---|---|
| Subject: | Re: LF: Better picture of the 807 based 500kHz TX |
| From: | "Graham" <[email protected]> |
| Date: | Tue, 18 Dec 2012 23:31:05 -0000 |
| Importance: | Normal |
| In-reply-to: | <CAKvcm2evEerTZqS07BZTUD8acksEv34vLApYU3wnCOGEDHSYMQ@mail.gmail.com> |
| References: | <CAKvcm2d8JffcrF9E7MojDPtEZVaJGTwxiX6yU0dWUUs0tYYuWQ@mail.gmail.com><[email protected]><CAKvcm2cgFMiw2fkhCXvh+op-35cxQX65F3GsNM7bBEgKee_3QQ@mail.gmail.com><[email protected]><CAKvcm2cwH8j7yVD2p+Qd+EcrMbzURfzbYFe_0K688-F75vBTjQ@mail.gmail.com><[email protected]> <CAKvcm2evEerTZqS07BZTUD8acksEv34vLApYU3wnCOGEDHSYMQ@mail.gmail.com> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Why the stabilised screen supply ? G.. -------------------------------------------------- From: "Dimitrios Tsifakis" <[email protected]> Sent: Tuesday, December 18, 2012 9:07 PM To: <[email protected]> Subject: Re: LF: Better picture of the 807 based 500kHz TX By the way, here is my current 40 m 807 transmitter.This was the first attempt at building a valve TX. people.physics.anu.edu.au/~dxt103/valves/807/ I will use the same type of chassis for the 472 kc version but I will use an old 450-0-450 (50 mA), transformer which also has a 225-0-225 and 6.3 windings, for a more compact result. My hope is that I can draw a bit more than 50 mA without overheating the transformer and is based on the fact that CW is not 100% duty cycle and also I am not using the other windings to their maximum current ratings. 73, Dimitris VK1SV |
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