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Re: Drake T4XC and R4C
¿ªÔÆÌåÓýHi Ralph, ? This isn¡¯t two rigs, but one receiver and one transmitter that can be operated as separates or transceive off of either VFO. ? With this much gain discrepancy between 80m and 15 meters there is a problem, likely alignment.? There could be some variation in the different band crystal output level, but I doubt it.? For certain the AGC threshold is all over the map.? A 1 microvolt signal (-107 dBm) should read S3 on all bands 80 ¨C 10 meters.? With those S meter readings there is no chance the S meter will read S3 at -107 dBm on all bands. ? With low gain on 80 and 40m reception may not be drastically affected since band noise is so much higher on the low bands.? The bottom line is Skip asked if this was the way the R-4C should operate and it is not operating anywhere near spec. ? Rob, NC0B ? From: [email protected] [mailto:[email protected]]
On Behalf Of Ralph Mowery via groups.io
Sent: Monday, March 27, 2023 4:15 PM To: [email protected]; [email protected] Subject: Re: [DRAKE-RADIO] Drake T4XC and R4C ? People would be better off if they scraped the numbers off the old rigs s-meters. ? As you have a calibrated generator you probably have a meter you can put across the speaker.? Send in a low level signal in the two rigs and see if you can hear or measure the audio at the speaker and see if the two? rigs seem to hear the weak signal equally.? This will tell you if the low s-meter indicates a problem or just a low meter reading. ? Ralph ku4pt ? ? ? On Monday, March 27, 2023 at 04:51:31 PM EDT, Skip via groups.io <wb4yvo@...> wrote: ? ? Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9.. |
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Re: TR7/R7 Extender Boards and Puller
I like PA0CMU's copy better. Easier on the fingers. :)
Of course a classic PC slot cover works best for the DR7. 73 -Jim NU0C On Tue, 28 Mar 2023 00:48:38 +0000 "Stan Gammons via groups.io" <buttercup11421@...> wrote: Here's a pic of the board extractor I have.? Seems like I got it with |
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
Oops. Missed one. RIT centering also requires the Jumper Board if you have a very early Parent Board. Later boards have a bottom access hole in the Parent.
On Mon, 27 Mar 2023 19:46:37 -0500 "Jim Shorney via groups.io" <jimNU0C@...> wrote: The only board you need for alignment is the Jumper Board for VCO and Translator alignment. In my experience the VCO and Translator rarely need alignment. They pretty much work or they don't. IIRC the Carrier Balance pot is accessible though a hole in the DR7. 2nd IF/Audio cans through rear panel holes. Most of the boards you would NOT want to put on extenders to align or alignment will not be optimal. |
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Re: TR7/R7 Extender Boards and Puller
Here's a pic of the board extractor I have.? Seems like I got it with
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the extender board kit?? Or I got it when I ordered the service manual.? Too much water under the bridge. I'm not sure. 73 Stan KM4HQE On 3/27/23 19:40, Jim Shorney wrote:
You can find instructions for making your own copy of the Drake board extractor near the bottom of this page: |
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Re: TR7 Extender Boards for sale. And a bad DR7 board, maybe.
The only board you need for alignment is the Jumper Board for VCO and Translator alignment. In my experience the VCO and Translator rarely need alignment. They pretty much work or they don't. IIRC the Carrier Balance pot is accessible though a hole in the DR7. 2nd IF/Audio cans through rear panel holes. Most of the boards you would NOT want to put on extenders to align or alignment will not be optimal.
73 -Jim NU0C On Mon, 27 Mar 2023 09:42:56 -0500 "Keith Erickson" <kognw@...> wrote: Extender boards needed for trouble shooting, alignment think not so much. |
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Re: TR7/R7 Extender Boards and Puller
You can find instructions for making your own copy of the Drake board extractor near the bottom of this page:
73 -Jim NU0C On Mon, 27 Mar 2023 15:16:19 -0700 "aa5wg via groups.io" <aa5wg@...> wrote: Hello to the group. |
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Re: T4XC AGC
¿ªÔÆÌåÓýWhoops, my message was lost¡NO, I haven¡¯t done the 6146 mod and don¡¯t? plan to unless I blew my 6JB6s and I couldn¡¯t find any more. ?Seeing as how I have NEVER LOST ANY final since 1965, I am doubtful I ever will have to! 73, Gary? WB6OGD? On Mar 27, 2023, at 5:03 PM, W6MQI via groups.io <w6mqi@...> wrote:
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Re: T4XC AGC
¿ªÔÆÌåÓýOn Mar 27, 2023, at 5:03 PM, W6MQI via groups.io <w6mqi@...> wrote:
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Re: T4XC AGC
I looked this situation with my early T-4X.? It had the 1meg resistor. ? |
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Re: Drake T4XC and R4C
¿ªÔÆÌåÓýThe R-4C is not S9 with a -73 dBm test signal.? -80 dBm to even -85 dBm is more typical for S9 from 80m through 10m.?? 160m is typically 10 dB lower in gain.? (That doesn¡¯t matter at all due to 160m band noise.) ? If in transceive mode, the T-4XC LO injection is another variable as your data appears to show.? None of the Drake mixers are near saturation, thus gain differences are typical in transceive mode due to LO level differences.? ? As a starting point consider the attached alignment tips.? (You can ignore the FPS-4 information.) ? Rob, NC0B ? From: [email protected] [mailto:[email protected]]
On Behalf Of Skip via groups.io
Sent: Monday, March 27, 2023 2:51 PM To: [email protected] Subject: [DRAKE-RADIO] Drake T4XC and R4C ? Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9.. |
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Drake T4XC and R4C
Haven't powered up in a while. So I thought I would..? Measured the signal strength using a Calibrated HP Signal Generator..? at -73DBM.? OR S9..
I got the following.. ??????????????????? R4C??????????? T4XC 3.5 ?? Mhz??????? S6????????????????? S2 7.1??? Mhz??????? S8????????????????? S9 14? ?? Mhz??????? S9????????????????? +10 21???? Mhz??????? +10??????????????? +10 28.5? Mhz???????? S9???????????????? +10 They should all be the same I would think...They are NOT Question? Why?? Does this need a good alignment?? Looks like the 3.5 Mhz is way off.. Skip |
Greg W9GB
Rob Sherwood
Jim Shorney
Gary WB6OGD
W6MQI
Skip