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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Re: G7NKS multiple spots |
| From: | John P-G <[email protected]> |
| Date: | Wed, 16 Sep 2009 21:20:47 +0000 |
| In-reply-to: | <C2B4D69309994436A1C18F1A29179585@AGB> |
| References: | <[email protected]> <[email protected]> <00a901ca370a$417ecc70$0217aac0@jimdesk> <261B000671B34914A1173F8F77A6D3CF@JimPC> <C2B4D69309994436A1C18F1A29179585@AGB> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Thunderbird 2.0.0.23 (Windows/20090812) |
Graham wrote: JIm,I think you find that is caused by 50 hz mains hum .... may be a hum loop in the audio system / pc-tx earthling , not likely to be psu problem as frequency is 50 (fund) and 150 ( 3 rd harm)I had a similar problem with my valve HF set , that was a slight ripple on the PA HT line caused by the 100% duty cycle of wspr, not part of the design criteria for ssb/cw , caused spots to appear +/- 100 Hz due to the full wave rectification in the psu Oddly though Jame's twin spots of Jim are 100Hz apart: M0BMU 0.503944 M0BMU 0.503844 John -- IP90gg Clousta, Shetland http://gm4slv.blogspot.com |
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