tag:blogger.com,1999:blog-9071048343455395511.post8152761573312880553..comments2024-03-24T22:03:31.205+00:00Comments on Roger G3XBM's (Mainly) Amateur Radio Blog: WSPR non-reciprosity?Roger G3XBMhttp://www.blogger.com/profile/13673890140751539870noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-9071048343455395511.post-7642305688715280042014-06-21T12:54:02.865+01:002014-06-21T12:54:02.865+01:00Usually I am giving other stations better reports ...Usually I am giving other stations better reports than they give me. Appreciate I may be off in frequency a bit, but that is NOT the reason Bob. CN8LI is just above lower band edge with me currently.<br /><br />G0LRD has just frequency calibrated one of my transmissions, so I should be able to offset a tad.Roger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-21916217902437904572014-06-21T11:50:56.042+01:002014-06-21T11:50:56.042+01:00Also being off frequency at either end can lose ba...Also being off frequency at either end can lose band edges. I think you are reporting CN8LI about 25Hz lower than he is putting him right on band edge according to you. I have him 25Hz in. I used to find the most drift on receive in the cycle after a transmission. FT897 with cooling fans good for 100 watts permanently on on Tx at 5 watts out!It caused me to miss a few on 28MHz, several on 50MHz and completely useless at 144MHz. I now have phaselock to an external OCXO. Also previously I could not complete a JT9 QSO on 28MHzBob G3WKWhttps://www.blogger.com/profile/17774644129884638614noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-21028975556291004622014-06-21T11:31:13.194+01:002014-06-21T11:31:13.194+01:00Roger's WSPR signals are very clean at my rece...Roger's WSPR signals are very clean at my receiver so I don't think there is an ALC problem. <br /><br />I thought of another possible reason for asymmetry: The frequency stability changing during receive and transmit. Most rigs are very stable during receive, but the short-term heat generation of transmit tends to cause drift on non-TCXO rigs. I think your rig Roger does this a little. Some, but certainly not all, of your transmissions show a slight slant and -1 drift reading.David (G0LRD)https://www.blogger.com/profile/11377879585873483008noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-49647139393259344782014-06-21T09:33:55.441+01:002014-06-21T09:33:55.441+01:00I had it once before, when I put down the ALC | au...I had it once before, when I put down the ALC | audio input, suddenly I got reports. 73 PaulPaul Stam PAØKhttps://www.blogger.com/profile/13472039726489965017noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-79215344314612818032014-06-20T23:40:22.854+01:002014-06-20T23:40:22.854+01:00Other possible causes:
- You are not putting out ...Other possible causes: <br />- You are not putting out the power you think you are. I wonder if this might explain the non-reciprocity between us that we sometimes see.<br />- Aircraft Doppler might be hitting you worse than others owing to your proximity to flight paths from Stansted. Certainly this evening a lot of your 6m signals were quite badly disrupted.<br /><br />Cheers, David G0LRDDavid (G0LRD)https://www.blogger.com/profile/11377879585873483008noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-88750290963693895002014-06-20T23:27:12.108+01:002014-06-20T23:27:12.108+01:00Hi Roger,
Just to let you know, the reason you get...Hi Roger,<br />Just to let you know, the reason you get few spots from me is due to high noise level beaming in your direction at least (S4). I can normally get nice decodes of you when I beam east and the noise floor drops to a decent level, as does the aircraft scatter.<br /><br />73 Colin - G6AVKG6AVK_QRPphttps://www.blogger.com/profile/15520998805514960469noreply@blogger.com