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QRSS transmitter 160m band, help needed please
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Chris McWhinnie
More likely to need a bit more feedback? try some?capacitance ~30pF? from base to emitter or base to collector. Or across other oscillator components. It may kick-start.? Sent from Chris McW's iPhone Amateur radio callsign: G?MQW
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"woodiescbj"
Many thanks for your relpy Chris, I will try that out.
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--- In QRPLabs@..., Chris McWhinnie <chrismac@...> wrote:
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"zl1ujg"
Hi
Another thing one could try assuming its the older QRSS TX, not the new multimode one, is to bypass the collector resistor of the oscillator transistor. A 100nF capacitor across that resistor may help. The unbypassed resistor provides (unintentional) negative feedback and in some situations can cause problems. Kevin ZL1UJG |
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"woodiescbj"
Hi Kevin, thanks for your reply, yes its the old one I have always wanted to do something on top band I thought this would be a good way to start, I will give your idea a try this weekend.
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Vy 73 de Colin DD5CF --- In QRPLabs@..., "zl1ujg" <zl1ujg@...> wrote:
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"Philip"
Hi Colin
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I built one and it works very well...running last night in fact... Not had any problems with the osc starting up though.. Few things I timkered with.. I couldnt get enough FSK shift with the twisted wire C3 so I used a 10pf small variable trimmer cap which cured it.. My output power was much lower than my other QRSS kits and I found that increasing C11 coupling cap, from the PA to the output filter from 1n to 15n helped in that respect.. Also, the slip of paper instruction for the 160 meter version has some caps labeled wrongly (I think..... please check Steve). It says C5 & C6 are 820pf and C7 & C8 are 2.2nF... I think it should read C5 & C8 are 820pf and C6 & C7 are 2.2nF... Good luck with it Philip G4JVF --- In QRPLabs@..., "woodiescbj" <jobaco@...> wrote:
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"woodiescbj"
Hi Phillip many thanks for your reply, yes I had spotted the mistake on the slip of paper I have built a couple of BPF's so it didn't look right ( note to Steve the info about the wrongly labled slip is from Phillip so thanks should go to him)thank you also for the info on the changes you made I will look into that once I get the kit to osc, is there much QRSS activity on 160m? I was looking on the internet but could find any grabbers for top band, it all seems to be centered around 30m band
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73 de Colin DD5CF --- In QRPLabs@..., "Philip" <pcteee@...> wrote:
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"woodiescbj"
Hi Steve, I spotted the mistake, but Phillip G4JVF was the first to publish it, so the thanks should go to him, on a different subject I now have the Ultimate QRSS chip V 1.3 (thank you to you and Hans for all your hard work I know you both do this in your spare time) I will use my U-QRSS for mainly for WSPR but will not be connecting a GPS module, I have no problem with entering Time and Loc per hand, so my question is do I need the V 1.4 upgrade?
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I will be buying another U-QRSS kit and I am looking at the website everyday in the hope that the number of kits will change from 3 to 100+, I can see this as being another Tony Parks story with your kits being sold out within a couple of hours. 73 de Colin DD5CF --- In QRPLabs@...m, Stephen Farthing <squirrox@...> wrote:
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"woodiescbj"
Thanks for the link Steve.
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73 Colin --- In QRPLabs@..., Stephen Farthing <squirrox@...> wrote:
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Stephen Farthing
Colin,
Thanks for the note. To answer your questions in reverse order :- I plan to do another 200 kits and have all the parts apart from some of the processors, which i used to recover from the faulty firmware problem. ?However I need a spare couple of days to get the parts in bags, bubble wrap the LCDs etc and so on and I have a few other things to do with my time.?
You will not need the 1.4 upgrade, the difference between 1.3 and 1.4 is to correct a bug with the calculation of the maidenhead locator from the GPS NMEA Lat data which affects people east of 0 degrees.?
And yes, thanks to Phillip! 73s Steve |
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"Philip"
Colin
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There isn't much activity at the moment on 160 but Chris on this link operates a 160 grabber quite often and being the nice guy he is, will set up his grabber if you contact him.... He was spotting my signal yesterday evening... Philip G4JVF --- In QRPLabs@..., "woodiescbj" <jobaco@...> wrote:
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"woodiescbj"
Thanks for the info Philip, sorry for the extra L in the last post ;)
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73 Colin --- In QRPLabs@..., "Philip" <pcteee@...> wrote:
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