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1. [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: G3SJJ <g3sjj@btinternet.com>; Date: Mon, 11 Dec 2006 09:48:21 +0000; I am noticing a receive loss of around 10-12 dB. I have checked Antenna B and receive antenna inputs. They are the same. What I do notice is around 2-4 s units difference in indicated signal strength; /archives//html/Yaesu/2006-12/msg00010.html (6,543 bytes)
2. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "dsthill" <dsthill@cbcbarbados.bb>; Date: Mon, 11 Dec 2006 11:28:18 -0400; Hi Chris As someone who zapped an FT1kmpMK5 about a year ago, I think it's easier than you think. I hope you were using bandpass filters on this rig. It's a common mistake I think to not use them in; /archives//html/Yaesu/2006-12/msg00011.html (8,191 bytes)
3. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "Mike K9MI" <k9mi@sbcglobal.net>; Date: Mon, 11 Dec 2006 16:01:14 -0000; Since the ARRL has the new "F" class (operating from an EOC) we have been operating from our EOC where the antennas for the 2 rigs we use are within about 40ft, and at the same height. Testing shows; /archives//html/Yaesu/2006-12/msg00012.html (10,719 bytes)
4. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: G3SJJ <g3sjj@btinternet.com>; Date: Mon, 11 Dec 2006 16:26:49 +0000; Thanks Mike. We had plenty of separation and bandpass filters. The suspicion is that the radio hasn't been smoked as a result of the contest, but there is definitely a receive fault. I am trying to d; /archives//html/Yaesu/2006-12/msg00013.html (11,444 bytes)
5. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "Cecil Acuff" <chacuff@cableone.net>; Date: Mon, 11 Dec 2006 17:37:19 -0600; I maybe way off but I think someone posted this type of problem a while back and it turned out to be a defective Inrad roofing filter. Roofing filter was removed and things returned to normal. Any ch; /archives//html/Yaesu/2006-12/msg00014.html (13,305 bytes)
6. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: G3SJJ <g3sjj@btinternet.com>; Date: Tue, 12 Dec 2006 12:30:44 +0000; There is a suggestion that my low RF gain could be a fault in the roofing filter. With the IF gain set at 13, I bypassed the filter, ie left it in position but put the coax leads back to their origin; /archives//html/Yaesu/2006-12/msg00015.html (7,572 bytes)
7. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "Tyler Stewart" <k3mm@verizon.net>; Date: Sat, 16 Dec 2006 00:52:15 -0500; Over the years, I've had several of the small coils in both the LP/HP and bandpass filters go bad...I'm sure due to excess RF. They seem pretty fragile. Since I started using RX limiters in the RX li; /archives//html/Yaesu/2006-12/msg00021.html (8,410 bytes)
8. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "G3SJJ" <g3sjj@btinternet.com>; Date: Sat, 16 Dec 2006 14:40:58 -0000; Thanks Ty. Well the problem does seem to be further along. I have determined that the sub-rx is mores sensitive than the main rx but several s-units, so the fault looks to be in the main rx IF chain.; /archives//html/Yaesu/2006-12/msg00022.html (9,376 bytes)
9. Re: [Yaesu] Ft1kMP loss of receive gain (score: 1): Author: "Tyler Stewart" <k3mm@verizon.net>; Date: Sat, 16 Dec 2006 20:50:05 -0500; Is it frequency dependent? A good check is find the points where it rolls over to the next bandpass filter and see if the sensitivity drop appreciably. All my problems have been confined to the HPF a; /archives//html/Yaesu/2006-12/msg00024.html (10,195 bytes)

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