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Uneven power on HF bands.

wm lewis All Messages By This Member #52527 Is the rig hooked up to a tuner/antenna or a dummy load. Could be a mismatch using tuner/antenna combo.Rig will automatically roll back power to protect finals. A 1:1 swr does not mean a 50 ohm load just a low reflected signal.
Jeff Steinkamp All Messages By This Member #52531 开云体育 The first question is are you measuring this into a dummy load or into and antenna?? If memory serves me correctly, you will see a bit of power drop, into a dummy load on 12 and 10 meters, probably between 90 - 95 watts maximum, in CW with key down.? This is normal with most? solid state radio these days.? I think my 857 gives me around 93 watts on 10 meters. wm lewis wrote on 6/18/2022 07:42: toggle quoted message Show quoted text Is the rig hooked up to a tuner/antenna or a dummy load. Could be a mismatch using tuner/antenna combo.Rig will automatically roll back power to protect finals. A 1:1 swr does not mean a 50 ohm load just a low reflected signal. -- Jeff K. Steinkamp (N7YG) Tucson, AZ Scud Missile Coordinates N32.2319 W110.8477
David Hardwick #52533 Try the Radio on a 50ohm dummy load first? before getting any further? into this discussion . You could have anything from a Plug to a relay to and SWR unit in line causing a minute amount of + or - j being seen by the Rig . toggle quoted message Show quoted text On 19/06/2022 4:47 pm, Adrian Fewster wrote: I disagree, the 1:1 swr does mean a 50 ohm resistive load. 50 + 0j. As I mentioned, indicated alc is minimal and there is no alc reduction of power due to swr sense, re; smenu items 53 -55 alc settings for reasonable swr protection,. as swr is 1.5:1 or less on each band. The same results occur using a DL as mentioned. I had just wondered if anyone had seen a hardware alignment to even up the individual band PO. Do you disagree with Rick Fearns ?? > Remember also that any reflected power eventually dissipates as antenna radiation and feedline heat loss after perhaps many reflections, between radio and feedpoint, which is the importance of using low loss feedline. 73 Adrian On 19/6/22 00:42, wm lewis wrote: Is the rig hooked up to a tuner/antenna or a dummy load. Could be a mismatch using tuner/antenna combo.Rig will automatically roll back power to protect finals. A 1:1 swr does not mean a 50 ohm load just a low reflected signal.
Dennis Colthurst All Messages By This Member #52534 5103881604 toggle quoted message Show quoted text On Sat, Jun 18, 2022 at 21:47, Adrian Fewster <vk4tux@...> wrote: I disagree, the 1:1 swr does mean a 50 ohm resistive load. 50 + 0j. As I mentioned, indicated alc is minimal and there is no alc reduction of power due to swr sense, re; smenu items 53 -55 alc settings for reasonable swr protection,. as swr is 1.5:1 or less on each band. The same results occur using a DL as mentioned. I had just wondered if anyone had seen a hardware alignment to even up the individual band PO. Do you disagree with Rick Fearns ?? > Remember also that any reflected power eventually dissipates as antenna radiation and feedline heat loss after perhaps many reflections, between radio and feedpoint, which is the importance of using low loss feedline. 73 Adrian On 19/6/22 00:42, wm lewis wrote: > Is the rig hooked up to a tuner/antenna or a dummy load. Could be a > mismatch using tuner/antenna combo.Rig will automatically roll back > power to protect finals. A 1:1 swr does not mean a 50 ohm load just a > low reflected signal. > > > > > >

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