"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- I agree with Garey 100%: it is a SYSTEM. Note the unusual heatsink Drake used. I have not seen this design used by anyone else. It is obviously designed for exhaust, just as Garey pointed out. If I remember correctly, the heatsink design was patented.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Garey Barrell Sent: Monday, November 21, 2005 10:42 AM To: drake Subject: Re: [drakelist] TR7 fan recommendations Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- This comes up every once in a while.... The fan on the TR-7 should always be mounted to blow air OUT. A piece of electronic equipment that is DESIGNED to be fan cooled has a cooling _SYSTEM_. The TR-7 system is designed for the air to be pulled in through the slots in the top and bottom of the cabinet and blown OUT via the fan. Reversing this flow does not cool the entire transceiver as effectively. As for the PTO temperature, the absolute temperature is not particularly important, rather the change in temperature as the heatsink heats and cools with transmissions. Blowing air IN forces the heated air from the heatsink past the PTO area, causing the PTO temperature to fluctuate. The dial lamp that some cite as a source of PTO drift is actually a constant heat source that helps to stabilize the PTO area at a slightly higher temp. There IS a "warmup" time for the TR-7 for this temperature to stabilize. 73, Garey - K4OAH Atlanta Drake C-Line Service Manual <http://www.k4oah.com> Floyd Sense wrote: > > "Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist > gang > ---------------------------------------------------------------------- > > I have a set of temperature probes and will take some readings near > the PTO with the fan blowing in and out to see what happens to the > temperature. Hard to believe that mounting the fan to blow in, rather > than out, would result in less PTO temperature rise. > > 73, Floyd - K8AC > ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
