tag:blogger.com,1999:blog-7702184209705146469.post6799160647822054027..comments2024-02-05T13:29:20.361-05:00Comments on DuWayne's Place: SNA Jr. II update UPDATED 8/29/16DuWaynehttp://www.blogger.com/profile/11286645084920270476noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-7702184209705146469.post-41339151085567597212016-10-27T19:52:56.039-04:002016-10-27T19:52:56.039-04:00If you have a scope check that you have output acr...If you have a scope check that you have output across the whole sweep range. With the input open you should have a baseline around -70 db. With a cable from the output to input a sweep should give a straight line around -5 db. Use a 10-20 db pi attenuator in line to check the response of the detector. If that works check the RLB.<br />DuWaynehttps://www.blogger.com/profile/11286645084920270476noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-84679905935244028462016-10-27T19:16:27.392-04:002016-10-27T19:16:27.392-04:00Hi DuWayne:
I have my snajr up and running, are t...Hi DuWayne: <br />I have my snajr up and running, are there simple tests to make the dds and detector circuit is working. I hooked my dummy load to rlb but showing only vertical lines after the sweep.<br />Thanks and 73 Ross K7RSBAnonymoushttps://www.blogger.com/profile/06952049495957258744noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-56590404057973396662016-10-20T14:47:10.263-04:002016-10-20T14:47:10.263-04:00FYI, I DFRobot will do a run of 10x 10x10 boards f...FYI, I DFRobot will do a run of 10x 10x10 boards for < $25<br />Good quality too, or so I have heard. I will report back when they arrive... could be some time.<br />/ Gerrygerrykhttps://www.blogger.com/profile/14393163615008388024noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-34634032133476312262016-10-20T04:00:39.051-04:002016-10-20T04:00:39.051-04:00Great, thanks. I'll let you know how the build...Great, thanks. I'll let you know how the build goes.<br />73<br />Gerrygerrykhttps://www.blogger.com/profile/14393163615008388024noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-63640436356322381862016-10-19T17:21:17.358-04:002016-10-19T17:21:17.358-04:00They are all 1206 size. Or you could use 0.1"...They are all 1206 size. Or you could use 0.1" leaded components with the leads cut very short and bent over.DuWaynehttps://www.blogger.com/profile/11286645084920270476noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-32227644995513280372016-10-19T16:15:25.045-04:002016-10-19T16:15:25.045-04:00Hi Duwayne...
Do you have a BOM for this by any ch...Hi Duwayne...<br />Do you have a BOM for this by any chance?<br />I could order by value, but I don't have enough SMD experience to be sure I got the right packages.<br />/ Gerrygerrykhttps://www.blogger.com/profile/14393163615008388024noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-22783066855179669892016-08-11T02:14:11.206-04:002016-08-11T02:14:11.206-04:00Hi DuWanye,
Thanks for the info, will give it a tr...Hi DuWanye,<br />Thanks for the info, will give it a try.<br />Best regards............Peter GW4ZUA Peterhttps://www.blogger.com/profile/06519305641111176464noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-18007128440807800262016-08-10T15:33:38.113-04:002016-08-10T15:33:38.113-04:00.
I used a power reference based on one from W!GHZ....<br />I used a power reference based on one from W!GHZ more information in a previous post http://kv4qb.blogspot.com/2015/10/20-mhz-power-reference-calibrating.html<br />After it was finished I measured the output with a scope and used a table of dBm to voltage conversion to get a more accurate reading, it was within 1.5 dBM http://ifmaxp1.ifm.uni-hamburg.de/DBM.shtml<br />If you do not have cal signal measure the output of the DDS connected to the log amp and use the table to get a dBM reading you can put in the sketch to calibrate.DuWaynehttps://www.blogger.com/profile/11286645084920270476noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-6531986801798645802016-08-10T13:59:48.080-04:002016-08-10T13:59:48.080-04:00Hello DuWayne,
Congratulations on an excellent pro...Hello DuWayne,<br />Congratulations on an excellent project.<br />I just had to make one,<br />My version was built on a single sided pcb, although I did use surface mount components on the copper side, around the ad8307 and I also screened the ad8307, and as yet I have not found a case for it.<br />While all the functions appear to be working I was wondering if you have a test method or calibration type check? My ad8307 came from china but I don't think it is a fake!<br />Best regards............Peter GW4ZUA <br /> Peterhttps://www.blogger.com/profile/06519305641111176464noreply@blogger.comtag:blogger.com,1999:blog-7702184209705146469.post-59259466793148367192016-06-10T19:52:04.831-04:002016-06-10T19:52:04.831-04:00Hello Duwayne, ive been following your build Any l...Hello Duwayne, ive been following your build Any location on where you posted your sketch? Ive put together a promini,encoder,si5351 ad8307 and working sketch but would like to try adding a display and sweep function like you have here, Great work, cant wait for the article in QRP :)<br />mike kd7uraMikehttps://www.blogger.com/profile/04097358197170407513noreply@blogger.com