Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- Qrptech
- Messages
Search
Re: QCX Arrived!!
Advice? Take your time and follow the instructions carefully. Double check each component before soldering. Don't rush the build. Relax and enjoy it. The qcx is a fantastic little radio that performs well above what its price would lead you to believe. Good luck Mike M. Ku4qo On Tue, Dec 31, 2019, 10:56 AM Michael Johnson <mike@...> wrote: Hi All, |
Re: micro-stripline SWR meter
Kurt Loken
开云体育Incidentally...I got a hold of a RS-232 to TLL converter ($5) ?and got my elecraft W1 talking to my “Arduino” board. ?It isn’t the final SWR and power feedback solution I’m going for in the low cost setup in the long term, but I I can now start coding my main project. On Dec 31, 2019, at 9:24 PM, Jerry Wolczanski <jerrywolczanski@...> wrote:
|
Re: micro-stripline SWR meter
Kurt:
As part of a project for an upcoming FDIM talk, I built about six different versions of SWR indicators.? The micro-strip-line has a lot going for it...but sensitivity isn't one of them.? The Stockton bridge like W8DIZ offers have terrific sensitivity and very low insertion loss.? Just saying.... good luck Jerry W KI4IO Warrenton, VA |
Re: micro-stripline SWR meter
开云体育Take it one step further...use 300 ohm twin lead overlapped with
a heavier gauge wire. On 12/31/19 11:51 AM, Kurt Loken wrote:
|
Re: micro-stripline SWR meter
Kurt Loken
toggle quoted message
Show quoted text
On Dec 31, 2019, at 5:05 AM, w8diz <w8diz@...> wrote:
|
Re: QCX Arrived!!
Kurt Loken
开云体育Hi MJ, I recently built the 20M version...great kit and great radio. ? I’m partial to see through cases (acrylic) if a case is even wanted at all. ?The circuits built are beautiful and look better than any mono color case in my opinion. ?I think it is a shame that a project isn’t done until you have hidden all that makes it actually great. ?Imagine if our world had more of the inner workings of our daily electronic devices visible as part of the art of packaging...would be more interesting to my taste. Also...if I remember the manual right...I think you don’t need to mount the connectors to the board...you can just wire them to your case instead. Good luck, Kurt-ae6uj On Dec 31, 2019, at 9:56 AM, Michael Johnson <mike@...> wrote:
|
QCX Arrived!!
Michael Johnson
Hi All,
Newish to the group and not so technically oriented.? Done a couple of smallish kit builds, but the QCX really caught my eye.? So, in the spirit of the season, any advice???? The package looks pretty straight forward.? Been through the manual and will do so once more before warming up the iron.?? I have not decided on a case just yet.? The gallery has some excellent ideas but I think I'll wait until I get the board up and running.? One question:? is there a good source for header pins and plugs for remoting the inputs, rotary's and plug-ins? Have a happy new year.? Most of the discussion on this group is beyond me, but I stumble along none the less. Vy 73 MJ, WO9B |
Re: micro-stripline SWR meter
开云体育Instead of PCB Strips, maybe try parallel wires? One main RF wire and two pickup wires Just a thought...and very simple...and CHEAP -Diz On 12/30/19 9:52 PM, Kurt Loken wrote:
|
Re: micro-stripline SWR meter
Kurt Loken
开云体育Thanks everyone. ?Great stuff. ?I am very enamored by the micro strip design though. ?There is a simple elegance to it and it isn’t really power limited like the qrp bridge kit...but hard to beat the price on that for sure. ? I saw a board from Bulgaria on eBay like what I want, but it would be $25 and I am intentionally trying to keep the price down on the project as a design requirement. I may end up getting my xacto knife out and carving my own board for the micro strip for a prototype, but I was hoping a cheap $5 to $10 kit was floating around out there. ? I am really enjoying Arduino boards...they really are a revelation...makes it easy to do cool stuff. Thanks again, Kurt-ae6uj On Dec 30, 2019, at 6:23 PM, Dale Hardin <joe.dale.hardin@...> wrote:
|
Re: micro-stripline SWR meter
Graham
Diz, W8DIZ still sells his universal SWR bridge kit ? $12.00 Not stripline but does work well for HF and may work in your application cheers, Graham ve3gtc? On Mon, Dec 30, 2019 at 9:04 PM Kurt Loken <kurt.loken@...> wrote:
|
micro-stripline SWR meter
Kurt Loken
Hello All, I'm looking for a low cost, high quality SWR meter solution I can use with an Arduino project.? Anyone made this "stripline" solution?? Looks interesting. I would rather not etch my own board or hunt down the parts as time is money...anyone have a kit of the thing or know where I could find one?? I really just want the board and non-meter parts...I don't need the analog meter. Thanks, Kurt-ae6uj |
QRP Guys regen rx build (Was: Tube Regenerative Receiver 12SN7/12V6)
Tomorrow (Mon.) may be the "big day" for me and Alex.? Together we are assembling the QRP Guys K8TND Regenerative Receiver Kit <?, a 4.5 to 12.7 MHz Hartley circuit.
There are only about a dozen components left to install, both electronic and mechanical before the proverbial "smoke-test". The most difficult step will be winding the toroidal transformer (only because he's never done it before).? I decided to wind the main winding to show him how to do it then let him do the Antenna and Tickler windings.?? This morning, I checked his soldering under high magnification and didn't find any joints that weren't acceptable.? Not perfect but absolutely -much- better than my soldering when I was 10 Y/O (he's 9).? Until I reviewed the photographs I shot, I didn't notice that he wasn't holding the iron handle at the balance point (I think I may have spooked him when I told him that past the handle insulator it was very hot).? He was holding it way back near the end where the cable enters.? ?Now I'm even more amazed at how well he did. More tomorrow after the end of our session. 73.......Steve Smith WB6TNL ? ? ? ? ? ? ? ? "Snort Rosin"? ?? |
Re: 2n2/40+ audio amp
开云体育On 12/28/2019 9:28 PM, Michael Maiorana
wrote:
You are welcome Mike.
The gain figures did not include Q14.? That stage adds another 10 dB of power gain.
Try this: Any of the nominal 1K primary transformers to 8 Ohms will work fine.? I've used 500, 800, 1K, and 1.2K primaries in various incarnations of that push-pull amplifier.? 800 Ohm primary was used in the simulation circuit that produced the output levels that I quoted in the previous email.? We used the 500 Ohm version in the NorCal 2N2/XX rigs.
72 and keep having fun;? Happy New Year to all, Jim, K8IQY
|
Re: 2n2/40+ audio amp
Straight from the horse's mouth. Thank Jim! Can you clarify if the stated gain includes the audio pre-amp stage consisting of Q14? I'd like to build it as designed, but those audio transformers are tough to find.? Thanks again and best 72 Mike M.? KU4QO On Sat, Dec 28, 2019 at 10:57 AM Jim Kortge <jim.k8iqy@...> wrote:
|
Re: 2n2/40+ audio amp
Jim,
toggle quoted message
Show quoted text
Thanks for jumping in to help us out! The 2n2xx is an interesting design, especially these days when so much is hidden in large IC's and DSP code. There's much to be learned from going back to basics. Jerry, KE7ER On Sat, Dec 28, 2019 at 07:57 AM, Jim Kortge wrote:
|
Re: 7 MHz Oscillator Ideas - good enough
Not meaning to hijack but ask question, I have both a rx/tx 40m and a 20m transceiver ?kitted by Ramsey so if I use my regulated power supply my kits won’t drift badly. Also I was told by friend to Band pass Filter upgrade for FCCcompliance... should I build it’s own box attached to output or? Thank you for your time.Mark kc0mh
|
Re: 2n2/40+ audio amp
开云体育On 12/28/2019 7:58 AM, Michael Maiorana
wrote:
Mike, That audio amplifier has a voltage gain of 60 dB, and a power gain of 83 dB.? The input impedance is 1700 Ohms and the output impedance is 8 Ohms as designed.? It can supply 125 millwatts of output power into 8 Ohms with a drive level of 1 millivolt.? It is also dead quiet with no input signal.? You won't know that it is "on" until it has an input signal.? No hiss at all.? Anything else you would like to know? 72 and keep up the good work, Jim, K8IQY
|
2n2/40+ audio amp
Can someone tell me what the expected voltage or power gain should be in the audio amp circuit in the 2n2/40+ receiver? The other receiver stages are clearly marked in the schematic with their expected gains. I'm trying to understand?the gain distribution in the receiver. Thanks! Mike M. KU4QO |
to navigate to use esc to dismiss