Re: [Elecraft] sub receiver question... 3db loss w/ 2 rcvrs
Bill NY9H wrote: > I heard an ICOM employee explain that the 7700 was better than the > 7800 because the 7700 did not have the 3db loss ... because it only > had one receiver in the 7700 ! wow ..that must make it a > "contest set" . > > i certainly don't mind the split loss in the 7800 or the k3.. > lease help support this email list: http://www.qsl.net/donate.html > The 3dB loss is meaningless. All modern receivers have way more sensitivity than they need 73, Ross N4RP -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question... 3db loss w/ 2 rcvrs
I heard an ICOM employee explain that the 7700 was better than the 7800 because the 7700 did not have the 3db loss ... because it only had one receiver in the 7700 ! wow ..that must make it a "contest set" . i certainly don't mind the split loss in the 7800 or the k3.. I had installed one in my 756pro3 so i could have a real 2nd receiver. and actually use a minicircuits in the K3 IF out so I can feed both my LP-PAn & the SDR/IQ... I like rocky on the LPpan bill __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
G'day, A contrary opinion, yes it is noticeable, particularly when trying to work signals near the noise. I usually have to crack where the callers are going through and then toggle the sub-RX off to make sure I have good copy on the target. In some circumstances I still find that using REV is the better option. Naturally if the target is head and shoulders above the noise, no problem, and the sub-RX sure makes working split a treat. Regards, Mike VP8NO K2 #1400 K3 #345 - Original Message - From: "Jim Danehy" To: "Elecraft Reflector" Sent: Friday, October 16, 2009 8:12 PM Subject: [Elecraft] sub receiver question >I own K3 # 3355. Love it. Only thing I do not have is the digital >recorder and the sub receiver. I am considering the sub receiver. I >read in the operating manual that there is a -3 db loss when both >receivers are using the "splitter" (common antenna). Is that >interpretation correct ? I would probably not be using two antennas >except on 160 and 80 which I operate sparingly in the winter. If I >use the sub receiver and the main receiver from the same antenna >can you notice the -3 db loss ? As we know that is a halving of the >signal. One db is the lowest difference your ear can detect. > > Jim W9VNE > K2 & K3 owner __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
3dB accross the combiner using both recievers, for low band use not an issue. The digi audio recorder is great. On air play-back is excellent. cheers Paul zl1ajy I own K3 # 3355. Love it. Only thing I do not have is the digital recorder and the sub receiver. I am considering the sub receiver. I read in the operating manual that there is a -3 db loss when both receivers are using the "splitter" (common antenna). Is that interpretation correct ? I would probably not be using two antennas except on 160 and 80 which I operate sparingly in the winter. If I use the sub re -- View this message in context: http://n2.nabble.com/sub-receiver-question-tp3838936p3839265.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
On Fri, 16 Oct 2009 16:17:18 -0700 (PDT), Bill W4ZV wrote: > > > >jim danehy wrote: >> >> I own K3 # 3355. Love it. Only thing I do not have is the digital recorder >> and the sub receiver. I am considering the sub receiver. I read in the >> operating manual that there is a -3 db loss when both receivers are using >> the "splitter" (common antenna). Is that interpretation correct ? I would >> probably not be using two antennas except on 160 and 80 which I operate >> sparingly in the winter. If I use the sub receiver and the main receiver >> from the same antenna can you notice the -3 db loss ? As we know that is a >> halving of the signal. One db is the lowest difference your ear can >> detect. >> > >Yes there's a 3 dB loss because the signal is split into two. On the low >bands, you will never notice a 3 dB loss because the ambient noise is so far >above the K3's sensitivity. > >73, Bill Bill is correct about probably not noticing the difference, but if it bothers you, you have the option of turning each receiver's preamp on. 73, Tom, N5GE n...@n5ge.com K3 #806, K3 #1055, PR6, XV144, XV432, KRC2, W1 and other small kits. 2 W2's on order 1 K144XV on order http://www.n5ge.com http://www.swotrc.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
Jim Danehy wrote: > I own K3 # 3355. Love it. Only thing I do not have is the digital > recorder and the sub receiver. I am considering the sub receiver. I > read in the operating manual that there is a -3 db loss when both > receivers are using the "splitter" (common antenna). Is that > interpretation correct ? I would probably not be using two antennas > except on 160 and 80 which I operate sparingly in the winter. If I > use the sub receiver and the main receiver from the same antenna can > you notice the -3 db loss ? As we know that is a halving of the > signal. One db is the lowest difference your ear can detect. Hi Jim, This is correct. Virtually all true dual-receive implementations use a 3-dB splitter to route the signal to both receivers while preserving impedance match. Most of the time you won't notice the 3 dB loss. It would only come into play on a band where both the noise and signals are extremely weak, and if it's an issue, you can turn the sub receiver off or use a separate antenna. You'll want a separate antenna anyway so you can use diversity receive, which works amazingly well in fading conditions. 160 and 80 meter operators in particular use this technique. I'd suggest matching the crystal filters on the main and sub receivers, at least those you might be using for diversity receive. 73, Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
Jim: I don't even notice it. The noise is similarly halved, so I just turn the gain to a comfortable level. The "loss" is that half the signal is going to each receiver. Others can explain it more technically, but I don't notice this "loss" Dick, K6KR Sent from my iPhone On Oct 16, 2009, at 4:12 PM, "Jim Danehy" wrote: > I own K3 # 3355. Love it. Only thing I do not have is the digital > recorder and the sub receiver. I am considering the sub receiver. I > read in the operating manual that there is a -3 db loss when both > receivers are using the "splitter" (common antenna). Is that > interpretation correct ? I would probably not be using two antennas > except on 160 and 80 which I operate sparingly in the winter. If I > use the sub receiver and the main receiver from the same antenna can > you notice the -3 db loss ? As we know that is a halving of the > signal. One db is the lowest difference your ear can detect. > > Jim W9VNE > K2 & K3 owner > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] sub receiver question
jim danehy wrote: > > I own K3 # 3355. Love it. Only thing I do not have is the digital recorder > and the sub receiver. I am considering the sub receiver. I read in the > operating manual that there is a -3 db loss when both receivers are using > the "splitter" (common antenna). Is that interpretation correct ? I would > probably not be using two antennas except on 160 and 80 which I operate > sparingly in the winter. If I use the sub receiver and the main receiver > from the same antenna can you notice the -3 db loss ? As we know that is a > halving of the signal. One db is the lowest difference your ear can > detect. > Yes there's a 3 dB loss because the signal is split into two. On the low bands, you will never notice a 3 dB loss because the ambient noise is so far above the K3's sensitivity. 73, Bill -- View this message in context: http://n2.nabble.com/sub-receiver-question-tp3838936p3838954.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] sub receiver question
I own K3 # 3355. Love it. Only thing I do not have is the digital recorder and the sub receiver. I am considering the sub receiver. I read in the operating manual that there is a -3 db loss when both receivers are using the "splitter" (common antenna). Is that interpretation correct ? I would probably not be using two antennas except on 160 and 80 which I operate sparingly in the winter. If I use the sub receiver and the main receiver from the same antenna can you notice the -3 db loss ? As we know that is a halving of the signal. One db is the lowest difference your ear can detect. Jim W9VNE K2 & K3 owner __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Sub Receiver Question
-.-. --.-N3TU -.-. --.- wrote: How do I get the sub receiver to receive? I can hear my main receiver on the left speaker and static on the right receiver. It sounds like I don't have an antenna on the sub. I checked the sub receiver's frequency with the main receiver and there is activity on the band. Have you selected the right antenna input for the sub-RX? Hold BSET, then tap ANT. See page 37 of the owner's manual. ~Iain ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Sub Receiver Question
How do I get the sub receiver to receive? I can hear my main receiver on the left speaker and static on the right receiver. It sounds like I don't have an antenna on the sub. I checked the sub receiver's frequency with the main receiver and there is activity on the band. -- View this message in context: http://n2.nabble.com/Sub-Receiver-Question-tp1442011p1442011.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
