Re: [Drakelist] R7 Tuning Instability

Arthur, Check the 25 volt DC input from the power supply board to the VCO. If that voltage is low the VCO doesn’t have the range it needs to tune the 10 and 15 meter bands. If your power supply board is the older type with the dc to dc converter, check the core on the transformer to make sure

[Drakelist] R7 Tuning Instability

I have a Drake R7 that sometimes displays an instability on the higher frequency bands when I first turn it on. On the 21 and 28 MHz bands the frequency reads as 16xxx kHz or 32xxx kHz, and continually increases, as if the radio is slowly counting something. The lower frequency ranges act

Re: [Drakelist] R7 AGC issues

I have no experience with the R7 but some experience with AGC loops in general. It is VERY difficult to design a good AGC and many radios get it wrong. For example, designing it for the user's eyes (vs ears) means paying too much attention to the S-meter indication. Using the loop feedback

[Drakelist] R7 AGC issues

Have had issues with the R7 AGC in fast mode in that the AGC would go into a low frequency oscillation excited by noise. Looking at the AGC line showed a triangular waveform. This caused distortion on AM and SSB signals. This problem went away when the RF gain control was turned

Re: [Drakelist] R7 AGC issues

Wow, nice detective work Paul! I've had correspondence with John too, but it was mostly about the AGC alignment and the subject of the fast AGC never came up. I would agree with the assessment that it is useless, the poppy-ness on noise alone is just to annoying to put up with, and manual

Re: [Drakelist] R7 AGC issues

Thanks Paul for sharing this! I found the fast AGC on the R7 useless, too. I will try the proposed mod on my R7. @Jim, would you say that the service manual describes the right methode for aligning the AGC? I have had my doubts about it in the past, mostly because 'fast' would always create

Re: [Drakelist] R7 AGC issues

On Sat, 11 May 2013 22:52:57 +0200, Dieter Horst wrote: @Jim, would you say that the service manual describes the right methode for aligning the AGC? I have had my doubts about it in the past, mostly because 'fast' would always create trouble. Yes. In my discussions with John, he told me that

[Drakelist] R7 For Sale

One and All, I have a very clean, fully functional R7 I would like to sell.  I have had the radio for about two years.  It hears very well and looks quite nice.  I am asking $1100 plus shipping from 80118.  If you are interested please email or give me a call.  Paypal plus fees will work, or

[Drakelist] R7 crystals

Sorry to interrupt, but does the R7 aux board use the R4 crystals or the SPR4 crystals? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] R7 crystals

On Sat, 8 Oct 2011 13:53:21 -0700 (PDT), Neil M Califano wrote: Sorry to interrupt, but does the R7 aux board use the R4 crystals or the SPR4 crystals? Neither. From the AUX-7 manual: The AUX7 is a plug-in unit which allows the user to program up to 8 auxiliary 500 kHz frequency ranges for

[Drakelist] R7 Incorrect Frequency

My R7 has suddenly developed the following problem: The frequency and frequency read-out on many of the bands is 2 MHz too low. So, for example, when I switch to the 80-meter band, and the receiver should be tuned to, say, 3650 kHz, it instead reads as 1650 kHz, and the received is in fact

[Drakelist] R7 transceive with T-4XC???

Hi to all: Can the Drake R7 receiver transceive with the Drake T-4XC transmitter?   Or, would I have to use the mute button on the R7 before transmitting? 73, Chuck - AA5WG ___ Drakelist mailing list Drakelist@zerobeat.net

Re: [Drakelist] R7 transceive with T-4XC???

Chuck - You can't 'transceive' with the pair, as there is no Premixer (PTO + BAND) signal in the R-7. The 7 Line sends the PTO signal back and forth for transceive. You CAN use the pair in SEPARATE by using the ANT and MUTE cables to connect the two, and depress the MUTE button on the R-7.

[Drakelist] R7 receiver

I see a R7 listed on Ebayhad what is listed as a FCC moda dimmer control added below bandswitch knob. Description states it dims panel lights ( I would assume vfo dial meter). Is this something Drake did at factory to R7's ( never saw one before),or is it a mod someone did after they

Re: [Drakelist] R7 receiver

Hi Paul, This does not look like Drake-original to me at all. Look at the text which is not even well aligned... 73, Dick PA2DW Op Mon, 04 Jan 2010 21:57:09 +0100 schreef Drakedude draked...@comcast.net: I see a R7 listed on Ebayhad what is listed as a FCC moda dimmer control

Re: [Drakelist] R7 receiver

I currently own two of the 'FCC-spec' R7s. As built by Drake. The dual BNCs on the rear (along with the IF buffer board) were added at the factory on special order. Each BNC connector has silk-screened lettering underneath that indicates its function. This also matches the rest of the

Re: [Drakelist] R7 receiver

On Mon, 04 Jan 2010 17:25:30 -0500, jfmull...@aol.com wrote: The dual BNCs on the rear (along with the IF buffer board) were added at the factory on special order. Does anyone happen to have a schematic of this IF buffer board? -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A.

[Drakelist] R7

May be interested in your swap Paul cqdek...@gmail.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

[drakelist] R7?

Floyd Sense [EMAIL PROTECTED] made an utterance to the drakelist gang -- Anyone have an R7 or R7B they'd like to part with? 73, Floyd - K8AC -- Submissions:

Re: [drakelist] R7 questions

Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Lars E. Pettersson wrote: Lars E. Pettersson [EMAIL PROTECTED] made an utterance to the drakelist gang

Re: [drakelist] R7 questions

Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- James - You have two of the four differences. #3 is the addition of an RC network in the AM filter slot that essentially uses the roofing filter (six

RE: [drakelist] R7 questions

Grant Youngman [EMAIL PROTECTED] made an utterance to the drakelist gang -- The only difference between the 4 kHz and 6 kHz filter with the synchro-phase AM detector is the selectivity. I had both filters, and always

Re: [drakelist] R7 questions

Lars E. Pettersson [EMAIL PROTECTED] made an utterance to the drakelist gang -- On 06/12/2006 03:26 AM, N5ARW wrote: 3) I also have a 1979 version of the service manual. Were there different versions of the manual as there was

Re: [drakelist] R7 questions

Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Grant Youngman wrote: Grant Youngman [EMAIL PROTECTED] made an utterance to the drakelist gang

RE: [drakelist] R7 questions

Grant Youngman [EMAIL PROTECTED] made an utterance to the drakelist gang -- The following accessories and modifications have been added to update your R7 to an R7A for more versatility. The biggest difference, aside from the

[drakelist] R7 questions

N5ARW [EMAIL PROTECTED] made an utterance to the drakelist gang -- I was very pleased to finally get a R7 this weekend, and I have a few questions for the group. 1) What are the differences between the R7 and the R7A. I know

Re: [drakelist] R7 questions

James: The R7A operator's manual that came with my R7A is an amended R7 manual. The table of contents contains the following wording: R7/R7A Supplement The following accessories and modifications have been added to update your R7 to an R7A for more versatility. 1) A noise blanker (NB7A) has

RE: [drakelist] R7 audio

:[EMAIL PROTECTED] Namens Garey Barrell Verzonden: dinsdag 30 mei 2006 4:45 Aan: DW Harms; Drakelist Onderwerp: Re: [drakelist] R7 audio Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Dick - Questions

RE: [drakelist] R7 audio

board. I ended up doing this with all the boards. --Ed G-- -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of DW HarmsSent: Friday, May 26, 2006 6:45 PMTo: drakelist@www.zerobeat.netSubject: [drakelist] R7 audio Drakelist de PA2DW

Re: [drakelist] R7 audio

Dick: There is an error in the R7 alignment instructions in the R7 service manual. If someone ever followed these instructions on your or Everet's R7 in the past, the R7 would sound just as you described. I have the correction to the instructions at home. Right now I'm traveling and can't get to

[drakelist] R7 audio

Drakelist de PA2DW, I am using a R7 in combination with my TR7 for some time now, with utmost satisfaction. What I do notice though, is the difference in the way the R7 sounds in comparison with the TR7 receiver. Especially with the AGC in position fast, the audio sounds very much like

[drakelist] R7 or 7a wanted

Rodger Singley [EMAIL PROTECTED] made an utterance to the drakelist gang -- I know this is a long shot but I would like to add either an R7 or 7A to complete my Drake 7 line station. If anybody is considering selling theirs

[drakelist] R7

Hello all, Im looking for a digital copy of the R7 service manual and TR7 user manual. Who can help me? The R7 I own seems to work well except the audio which is not the Drake quality. It sounds sharp (much more high tones then the TR7) and ticks. Its tiring to listen to! I suspect

Re: [drakelist] R7/TR7/R7A buttons

mike maghakian [EMAIL PROTECTED] made an utterence to the drakelist gang -- buttons are sold ! __ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone.

Re: [drakelist] R7(A) SL500, 500 Hz filter

Lars E. Pettersson [EMAIL PROTECTED] made an utterence to the drakelist gang -- On Tue, 2004-12-07 at 05:02, Rein A. Smit wrote: I am looking for the specs of a SL500 filter crystal for the R7/R7a How many crystals? 8 poles.

Re: [drakelist] R7(A) SL500, 500 Hz filter

Rein A. Smit [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi Lars, Thanks. I should have waited with the question as I found I believe another side with a partial R7 manual, no schematics. And there, the auxiliary

[drakelist] R7 display

Robert Nickels [EMAIL PROTECTED] made an utterence to the drakelist gang -- I turned my R7 on for the first time in a while and was greeted by a blank display. I'd be interested in hearing from anyone who might have run into

[drakelist] R7

Enrico Oliva [EMAIL PROTECTED] made an utterence to the drakelist gang -- I need the schematic diagram of the R7 receiver. Could anybody please suggest a source? Thanks 73 Enrico

[drakelist] R7 low level on 10M

I have a TR7 and an R7 ... I have noticed that the R7 sensitivity is lower on 10M than the TR7- enough that I notice the audio level difference ... normal? Or should I realign the R7. -- Submissions:[EMAIL PROTECTED]

[drakelist] R7-TR7 cable

Hi Drake net, anybody could help me in finding an interconnection cable between an R7 and a TR7? 73 to everybody by IOKPL, Pietro -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe

Re: [drakelist] R7-TR7 cable

http://www.wb4hfn.com/DrakeArticles/DrakeParts/TransceiveCable.htm On Friday, October 3, 2003, at 07:24 AM, Pietro Lapiana wrote: Hi Drake net, anybody could help me in finding an interconnection cable between an R7 and a TR7? 73 to everybody by IOKPL, Pietro