tag:blogger.com,1999:blog-6542457291632389556.comments2024-02-05T10:19:38.199+02:00N4HAY / ZS6RSHAnonymoushttp://www.blogger.com/profile/11900428914896369364noreply@blogger.comBlogger52125tag:blogger.com,1999:blog-6542457291632389556.post-65562012300072798702022-03-04T08:13:58.402+02:002022-03-04T08:13:58.402+02:00888casino Casino PA - Dr. Maryland
888casino has a...888casino Casino PA - Dr. Maryland<br />888casino has a <a href="https://drmcd.com/%ea%b5%b0%ed%8f%ac%ea%b0%80%ec%9e%a5-%ec%9d%b8%ea%b8%b0-%ec%9e%88%eb%8a%94%ec%b6%9c%ec%9e%a5%eb%a7%88%ec%82%ac%ec%a7%80%ea%b0%80%ea%b2%8c.html" rel="nofollow">군포 출장샵</a> tremendous sportsbook, live casino, table <a href="https://drmcd.com/%ec%b6%98%ec%b2%9c%ec%b5%9c%ea%b3%a0%ec%9d%98%ec%b6%9c%ec%9e%a5%ec%95%88%eb%a7%88%eb%b0%9b%ec%95%84%eb%b3%b4%ec%84%b8%ec%9a%94.html" rel="nofollow">춘천 출장샵</a> games, and slots galore in PA. <a href="https://www.mapyro.com/%eb%ac%b8%ea%b2%bd%ec%b5%9c%eb%8c%80%ea%b7%9c%eb%aa%a8%ec%b6%9c%ec%9e%a5%ec%83%b5.html" rel="nofollow">문경 출장마사지</a> 888 Casino is <a href="https://worrione.com/" rel="nofollow">바카라 사이트 검증</a> available <a href="https://drmcd.com/%ea%b3%b5%ec%a3%bc%ec%b5%9c%eb%8c%80%ea%b7%9c%eb%aa%a8%ec%b6%9c%ec%9e%a5%ec%95%88%eb%a7%88.html" rel="nofollow">공주 출장마사지</a> in four locations within the state.samouelfaidleyhttps://www.blogger.com/profile/09646627553316616940noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-82512587270906605432022-01-23T16:50:22.965+02:002022-01-23T16:50:22.965+02:00Da.Da.Constantin Rusuhttps://www.blogger.com/profile/12959087644397138179noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-82338092136526175202021-08-04T13:34:32.924+02:002021-08-04T13:34:32.924+02:00Thanks for sharing. I needed a band pass filter ab...Thanks for sharing. I needed a band pass filter about two months ago. Following an online search, I discovered the anatech electronics website. I received all of my required <a href="https://www.anatechelectronics.com/products/standard/band-pass-183.html" rel="nofollow">band pass filter</a> requirements on time from them based on that I have also requested for a custom band pass filter design and received the best product from them in a short time. If you require any band pass filters, you can also contact them.Hendryhttps://www.blogger.com/profile/17353982573135682233noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-2294571934384522072019-06-18T09:05:08.489+02:002019-06-18T09:05:08.489+02:00You did a wonderful thing and should be proud of y...You did a wonderful thing and should be proud of yourself for sharing. Thank you! I am very happy to your post its a great post, I'm glad you enjoyed the post.Keep sharing such useful information's. So informative blog, thanks for providing valuable information.<br /><a href="http://www.panaceapgx.com/" rel="nofollow">bipolar genetic testing</a><br />Jhon machttps://www.blogger.com/profile/15268898196520486192noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-64584560912446477242019-06-14T16:22:33.339+02:002019-06-14T16:22:33.339+02:00This comment has been hidden from the blog.villi johnshttps://www.blogger.com/profile/13321149893786259936noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-35695902996656935912018-08-06T18:08:21.715+02:002018-08-06T18:08:21.715+02:00Hi, I also have constructed this Signal Source. ...Hi, I also have constructed this Signal Source. I used a J310. It delivered a distorted output signal, but in my case it was the top half of the sine wave being more "rounded" than its lower half of the sine wave. Interesting to note that your signal became better when you used a lower Idss (MPF102) JFET. I might try this, and see what happens. Anonymoushttps://www.blogger.com/profile/11205388909517415147noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-31517274013707779732018-01-28T16:41:07.312+02:002018-01-28T16:41:07.312+02:00Hello Randy,
if you need help send me the parts a...Hello Randy,<br /><br />if you need help send me the parts and I will built it for you. No Problem!<br /><br /> 73 de DH6SAU Harry.<br />ernamanzhttps://www.blogger.com/profile/02921583532447630137noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-4718971593763573892016-03-11T01:54:51.310+02:002016-03-11T01:54:51.310+02:00Thanks for the comment Richard. I for one, am comp...Thanks for the comment Richard. I for one, am completely confused as to why one would operate a BALUN well outside the impedance specification that it is built, designed and specified for. I am aware that this is the practice amongst many hams, especially when running a doublet into a balanced feeder. I suggest that better practice is to deploy a balanced ATU for this configuration. This will cancel out reactances and allow the presentation of the correct a resistive load to the BALUN thereafter.Anonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-87941856199415200902016-03-10T23:12:22.048+02:002016-03-10T23:12:22.048+02:00Dick thanks for those results. I'd be interes...Dick thanks for those results. I'd be interested in seeing what losses the balun presents when it's operated well outside of standard impedance since I think many hams will use this with a multi-band antenna they are likely to be driving it at impedance as much as 10:1 from 50ohm.<br /><br />72<br />Rich AA4OOAA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-40934998631326049132015-11-19T04:33:44.488+02:002015-11-19T04:33:44.488+02:00No but sometimes I wish it wouldNo but sometimes I wish it wouldAnonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-41972274848776046192015-11-19T04:29:52.525+02:002015-11-19T04:29:52.525+02:00Does it turn up to 11 ?Does it turn up to 11 ?AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-58469328172917818912015-08-24T09:55:50.891+02:002015-08-24T09:55:50.891+02:00Richard Yes that is the reason. Class A is very in...Richard Yes that is the reason. Class A is very inefficient unfortunately. If current draw is an issue maybe an audio output transformer and a slightly different design could reduce current drain to 1/2 or for a good design 1/3 of what a resistor based class A amp will draw. Of course the trade off is the cost of the transformer and the fact that the range available these days is greatly reduced. If you can find an old driver transformer which used to drive a push pull transistor output stage it should do the job. <br />73 Mark VK6WVMarkDhttps://www.blogger.com/profile/02578197889402236960noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-59852123725801563402015-08-24T04:49:58.924+02:002015-08-24T04:49:58.924+02:00Hi Mark
Ok I think I know why you recommend 270 oh...Hi Mark<br />Ok I think I know why you recommend 270 ohms as opposed to 150 ohms for the collector resistor. This is because I only need 1V p-p output. I could get more power into the headphones than 1V if I used 150 Ohms. However this would require higher quiescent current. Anonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-64283470256272740672015-08-24T04:20:33.656+02:002015-08-24T04:20:33.656+02:00Will do Richard and many thanks for the comments ...Will do Richard and many thanks for the comments and all noted. It took me sometime to find the correct jack for the mic. Eventually I sourced one from Aircraft Spruce. So my plan is to first get the headset correctly matched. Thereafter some time down the road I will tackle the mic. That will also need a pre-amp I think and of course a voltage source as you indicate. I think the radio shack speaker issue needs a different solution to this high impedance headphone kind of amp since I am assuming it is a low impedance.Anonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-92225799530961623712015-08-24T04:16:29.167+02:002015-08-24T04:16:29.167+02:00Hi Mark,
many many thanks for your reply. You will...Hi Mark,<br />many many thanks for your reply. You will be amused to hear that I figured it out about 30 minutes after my experiment to increase the voltage across the emitter resistor. We then went on a long sunday evening to take our dog for a walk. That is when the penny dropped hi! Of course I was starving the transistor of current since it was being consumed by the load and thus turning off. In fact the calculations show that the transistor would indeed turn off at about 250 - 300mV load voltage.<br />Now I thought that R3 (collector resistor) should be changed to 150ohms and that about 14mA (or more) would be needed. With a collector load of 150ohms I think I would get maximum power transfer to the load. Please kindly let me know why you recommend 270 Ohms? Thank you Mark and your comments are exactly what I was hoping for by posting the write up. 73. DickAnonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-47612121076636961512015-08-24T01:48:09.645+02:002015-08-24T01:48:09.645+02:00Richard, you have made the same mistake I used to ...Richard, you have made the same mistake I used to make when I started design. Your amplifier can not supply enough current for your load. AT 1V from Ohms law your 150 Ohm headphones need about 7 mA, or more likely 10mA to stay linear. Change your R3 to 270 Ohms and scale your other values and you should be okay. 73's Mark VK6WVMarkDhttps://www.blogger.com/profile/02578197889402236960noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-53076345632826695312015-08-24T01:40:06.751+02:002015-08-24T01:40:06.751+02:00As I used to be an active pilot I had a DC H10.13....As I used to be an active pilot I had a DC H10.13.4 headset. When I operated QRO my ICOM 746 would drive the audio sufficiently but I needed an adapter for the mic on the headset. I wired up an adapter for the mic and experienced my first real RF bite as the mic touched my lips. I tried all manner of things to shield that connection to no avail. <br />When you work up a clean amp circuit I'd be interested in using it to drive my external Yaesu PA speaker. Ive tried choking the power supply to my little radio shack speaker amplifier but it still picks up RF on 30m.AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-74204604378962322882015-08-24T01:37:24.538+02:002015-08-24T01:37:24.538+02:00As I used to be an active pilot I had a DC H10.13....As I used to be an active pilot I had a DC H10.13.4 headset. When I operated QRO my ICOM 746 would drive the audio sufficiently but I needed an adapter for the mic on the headset. I wired up an adapter for the mic and experienced my first real RF bite as the mic touched my lips. I tried all manner of things to shield that connection to no avail. <br />When you work up a clean amp circuit I'd be interested in using it to drive my external Yaesu PA speaker. Ive tried choking the power supply to my little radio shack speaker amplifier but it still picks up RF on 30m.AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-21432256906050321892015-08-21T11:34:33.060+02:002015-08-21T11:34:33.060+02:00I like the "board" design of his homebre...I like the "board" design of his homebrew tuner.AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-76059151531339952512015-08-21T11:34:27.094+02:002015-08-21T11:34:27.094+02:00I like the "board" design of his homebre...I like the "board" design of his homebrew tuner.AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-71376696727710213012015-08-14T13:27:53.406+02:002015-08-14T13:27:53.406+02:00Dick, could this work as an amplifier for my exter...Dick, could this work as an amplifier for my external 4 ohm Yaesu speaker for my Ham radio? <br />My Elecraft KX3 doesn't have a PA circuit and the headphone output doesn't have enough juice to drive my external Yaesu speaker. When I've tried using an old small battery powered RadioShack speaker amp it picks up RF during transmit and makes a ruckus.AA4OOhttps://www.blogger.com/profile/08437750216586991500noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-38951871645003696562015-07-31T14:44:10.691+02:002015-07-31T14:44:10.691+02:00Great to see you and Berry on Saturday. The party ...Great to see you and Berry on Saturday. The party was a lot of fun. Sorry I missed FOBB, but we were chasing wild ponies on Shackleford. What a beautiful weekend that was. Glad you had smooth sailing at Ebeneezer. Last time I was there, a ranger told me I couldn't operate unless I obtained a special use permit - egad ! I'm going to e-mail you info about the segmented dipole I use for these events. Saves having to erect several separate antennas. Did you see the video Paul posted from his FOBB /MM ops? See you on Skeeter and Peanut Power. 73, Marc W4MPS Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-91425224724928191832015-07-25T12:20:44.583+02:002015-07-25T12:20:44.583+02:00Hi Pierre for some reason my replies to your comme...Hi Pierre for some reason my replies to your comments don't seem to get published. I wanted to check to see if you receive them? Many thanks 73 DickAnonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-79955587301418642632015-07-25T07:20:21.661+02:002015-07-25T07:20:21.661+02:00Dick,
A while back I tried to determine what work...Dick,<br /><br />A while back I tried to determine what works best for me and my Elecraft K2. <br /><br />I was most impressed with the in-ear headphones (Bose ?). The audio output was rather impressive, same for the audio quality. Needless to say the earbud headphones are tiny and weigh next to nothing i.e. ideal for ultralight portable. <br /><br />73 – Pierre ZS6A<br />Pierrehttps://www.blogger.com/profile/16230877697387453564noreply@blogger.comtag:blogger.com,1999:blog-6542457291632389556.post-29113147963706111802015-07-21T01:16:53.002+02:002015-07-21T01:16:53.002+02:00Hi John, Many thanks for the comment. Yes amazing ...Hi John, Many thanks for the comment. Yes amazing as it seems I did take almost all this 'stuff' along for our last Field Day contest 2015. I did feel pretty well prepared and could definitely have cut down in many areas at the expense of comfort of course. Good luck with your QRP adventure. Enjoy! 72 de Dick n4HAY Anonymoushttps://www.blogger.com/profile/11900428914896369364noreply@blogger.com