[AMRadio] Source Broadcast Xmtrs

[John Tate]

In fact, the FT-990 includes AM and the manual has instructions on how to properly setup for AM operation. That doesn't mean it is in the same class of quality audio and signal production that most AM operators strive to acheive. 

 Does the FT-990 have a good reputation for AM? So far we have you saying yes and Ed saying no. I don't recall hearing ANY FT-990 rigs on A.M. for the last 3 years that I have been enjoying AM. You're in Tampa Bay I think Ron, I'm in S. Louisiana. Maybe we can set up a schedule for next weekend on 40 meters and I can have a listen for myself? What do you say?

 73, John KX5JT
----- Original Message -----
From: Ron Youvan
Sent: 06/11/11 10:40 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Source Broadcast Xmtrs

 Hi Ed Sieb: > I can tell you categorically that the FT-990 is very poor on AM. For one thing, the ALC > cannot be removed, leading to compression and backwards modulation on audio peaks. The > proper way to run a rice-box on AM is to lift the ALC, so as to allow good positive > peaks. As well, the '990, unless modified, has poor audio bandwidth on AM. ------------------------------------------------ A Stradivarius is only of value to a master violinist. ------------------------------------------------ Operating manual for FT-990 - page 33. AM transmission Transmitter power output in the AM mode is limited to 25 Watts (carrier). All you need to do is to adjust the MIC control to avoid overmodulating, and select the desired power level. [] With the AM mode selected, set the meter selector to the PO position, and preset the RF PWR control fully clockwise. [] Even if you have already set the MIC control as described for SSB transmission, you will need to readjust it to avoid overmodulation. [] VOX operation can be used in the AM mode, but for now, make sure the VOX switch is off, so as not to confuse adjustments. [] Close the PTT switch and speak in to the micro- phone while adjusting the MIC control to the point where slight movement of the (PO) meter can be seen. Don't set it too far beyond this point or your signal will be distorted. [] Adjust the RF PWR control for the desired output. The speech processor is disabled in AM mode. ------------------------------------------------ The FT-990 has a good reputation for good AM quality. -- Ron KA4INM - You can't fool me ... ... I'm a moron. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html