tag:blogger.com,1999:blog-7590176649168185428.post7985270011686297018..comments2024-03-29T07:34:28.586-04:00Comments on SolderSmoke Daily News: "Receiver Here is My SWR meter OM..."Bill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-7590176649168185428.post-19699217346022326422015-12-28T08:00:57.235-05:002015-12-28T08:00:57.235-05:00Bill,
You are missing an opportunity to have "...Bill,<br />You are missing an opportunity to have "free" electricity. When not operating on 160M you need to gin up a voltage doubler circuit and with that you can charge batteries or run your Frankenstein Radio off of that power source. I think this idea originally appeared in a "transistor radio circuits book" from Tom KneitelN6QWhttps://www.blogger.com/profile/09160697334746659660noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-67835304445319066022015-12-27T19:27:24.958-05:002015-12-27T19:27:24.958-05:00I remember a schematic - I could probably replicat...I remember a schematic - I could probably replicate it - for a crystal AM receiver, that used a second tuned stage (but fixed, to the strongest station in your area) to power a transistor amplifier for (modern, not crystal) headphones.<br /><br />Mike Yancey, KM5Z<br />Dallas, TexasMike Yanceyhttps://www.blogger.com/profile/03492198274592573762noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-26490445227814238932015-12-27T17:36:18.193-05:002015-12-27T17:36:18.193-05:00Bill,
Strong local signals like this can challenge...Bill,<br />Strong local signals like this can challenge many receivers as the frequency and TX is so close and your wire long. I run my inverted L as a folded monopole as written up in the past by Bill Orr. Not only does this provide an impedance transformation to something close to 50ohms it seems to attenuate off frequency signals.<br />http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/hr/1990/03/page49/<br />I use zip cord speaker wire. It is bit shorter than 40m because of the velocity factor of the wire in transmission line mode.<br />Andrew de vk5cv / vk5zuc@hotmail.comAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-80182685036907046792015-12-27T14:06:16.638-05:002015-12-27T14:06:16.638-05:00There is a great article in January, 2016 QST on h...There is a great article in January, 2016 QST on how to roll your own BCB reject filter. Pg. 69Bruce - KK0Shttps://www.blogger.com/profile/07111415158794117864noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-12362859825859369852015-12-27T13:41:33.169-05:002015-12-27T13:41:33.169-05:00With this much RF available out of thin air, throw...With this much RF available out of thin air, throw an electrolytic cap across the diode output and you have the makings of a "free power" source that can power a couple of transistors for an audio amplifier. You will have a "free power" radio receiver that can run a small speaker. Fun!Bruce - KK0Shttps://www.blogger.com/profile/07111415158794117864noreply@blogger.com