"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- An interesting aside is that the L/C pass band filter in both the 2-B and R-4 series below the C are interchangeable. I had a parts unit R-4B with a good filter unit and transplanted it temporarily in my 2-B just for curiosity. It worked fine but of course I would have had to make some kind of switch plate for the front panel to identify the selectivity positions and the tuning ranges. Instead I'm building a 2 section coupled resonator to use on the 2-B strictly for AM reception. I don't like that 3.6kHz position in the 2-B and modifying the filter unit for a wider pass band is not practical.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Garey Barrell Sent: Wednesday, December 07, 2005 12:46 PM To: Steve Berg Cc: [email protected] Subject: Re: [drakelist] 2B vs. R4B Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Steve - The 2-B Passband tuner has three L/C bandwidths available. 0.5 kHz at -6 dB // 2.75 kHz at -60 dB 2.1 kHz at -6 dB // 7.50 kHz at -60 dB 3.6 kHz at -6 dB // 10.5 kHz at -60 dB The R-4/A/B all have four L/C bandwidths. 0.4 kHz at -6 dB // 2.6 kHz at -60 dB 1.2 kHz at -6 dB // 4.8 kHz at -60 dB 2.4 kHz at -6 dB // 8.2 kHz at -60 dB 4.8 kHz at -6 dB // 20 kHz at -60 dB The R-4C has two crystal bandwidths standard. 2.4 kHz at -6 dB // 4.2 kHz at -60 dB 8 kHz at -6 dB // 28 kHz at -60 dB (Roofing Filter) Optional filters were available. 250 Hz at -6 dB // 600 Hz at -60 dB 500 Hz at -6 dB // 1000 Hz at -60 dB 1.5 kHz at -6 dB // 3 kHz at -60 dB Optional filters in AM Mode ONLY. 4 kHz at -6 dB // 7.5 kHz at -60 dB 6 kHz at -6 dB // 10 kHz at -60 dB The 2-BQ Q Multiplier is a VERY effective accessory for the 2-B. It offers a variable bandwidth, tunable IF peaking filter for CW or a tunable IF notch filter. The Heath Q Multipliers work just about the same, since the circuit is almost identical. The QF-1 requires power (available from the 2-B Accy Jack). 73, Garey - K4OAH Atlanta Drake C-Line Service Manual <http://www.k4oah.com> Steve Berg wrote: > > Steve Berg <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > How do the 2B selectivity curves compare with the R4B curves? I'm new > to Drake equipment and thought that the 4 series used crystal filters. > A thread here now tells me that this is not the case. Also, how well > do the 2B receivers work with Q multipliers like the 2BQ and the > Heathkit series? I use my 2B with a Gonset GSB-100 exciter, probably > heresy on this list, but they work well together on both CW and SSB > from my limited experience. > > 73, > > Steve WA9JML > ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
