"Rich Carter" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Ron I'm using a Daiwa HF wattmeter on the peak setting. While I realize the meter should show a low reading, I would expect that a I should need to reduce the RF gain from max to prevent overdriving the rig. Since the rig lacks speech compression, I don't know what I should measure, but I would expect a 300W rig to drive at least 10W or or more. What do others see on their meters?
It seems to me that the collins mic I have is not matched properly. I have my hands full alignment issues. It may be best for me to replace the mic with something that is known to work with this rig. Rich - KE1EV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wagner > Sent: Sunday, January 20, 2008 7:37 AM > To: [EMAIL PROTECTED] > Subject: RE: [drakelist] Microphone question > > > Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > Rich, > It has been a while since I had my TR3, but I do remember > that a 600 ohm hand mic I had tried was not good match for > the rig. I would guess 2K ohms would be in the ball park. > They were made in the days of high impedence mics. > > As far as getting only a few watts out, how are you measuring > that? Most watt meters I have seen (unless they are peak > reading) only show a few watts of RF on the Drakes while > measuring SSB. Drakes are not using compression, so they > have a very large peak to average power ratio. What that > means is that unless the meter is designed to read peak > power, it will show a very low average power. Average power > being what most meters read. My TR7 typically shows about 5 > watts on my Drake MN4 watt meter. > And I know that on a peak watt meter I have ~200 watts going out. > > One last thing, on AM it will also show low power. Drakes > use controlled carrier AM. That is the carrier changed as > you spoke. What that does is lower the heat on the finals. > The TV sweep tubes were designed for high peak, low average > power. If you ran them any other way, you wore them out very > quickly. Ideal for uncompressed SSB service, not so good for > other service. > > Hope this helps. > > 73, > Ron WD8SBB > > On Sat, 19 Jan 2008, Rich Carter wrote: > > > The mic came with the rig. I assume they should work > together. The > > mic seems to work, but it doesn't have enough drive for the > radio. I > > only get a couple of watts out for SSB if I yell into the mic. The > > problem could be in the rig, but I thought it best to check > the mic first. I opened it up. > > There's a 4 ohm microphone element and a matching transformer that > > says BT3 > > 001 on it. I can find no specs for the mic. What is more > frustrating > > is there appears to be no information about what the drake > transceiver > > wants for mic impedance. I don't have any matching > transformers in my > > spare parts bin. Before I run out there and buy some > parts, I thought > > it best to see if anyone knows what the heck the rig wants. > > > > Thanks for the reply > > Rich > > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe > drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
