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# <a name="2m Radio Receiver for the LV2 Re"></a> 2m Radio Receiver for the LV2 Recovery Node

### <a name="Overview:"></a> Overview:

A 2m amateur radio receiver which sends audio (in out case, DTMF tones) to the [[Recovery Node|RecoveryNodeLV2]].

- Good link: [http://www.geocities.com/hagtronics/2\_meter.html](http://www.geocities.com/hagtronics/2_meter.html)
- Ground radio [Yaesu FT-1500m](http://www.yaesu.com/amateur/ft1500m.html).

### <a name="Work in progress"></a> Work in progress

**2 METER RECEIVER PARTS LIST**

I have to confess I cheated here. Since I am typing with 9 3/4 fingers, the less of IT I have to do the faster this is going to get done. So, I grabbed the original parts list and deleted what we were NOT going to use. I then altered the parts to suit the fact that we were going surface mount as much as was possible (given sufficient funds, of course.)

These resistors are the 1206 type surface mount items. Unless indicated, all part numbers are Digi-Key (even though Mouser, if they have them, is likely to be cheaper. That is why many of the original parts were Mouser part numbers, but I know Digi-key is THE source.) Note that all parts pertaining to the U-controller are gone, as per instructions. It turns out these smaller resistors have the same dissipation rating, i.e. 1/4 watt, as the thru-hole type. Note that we may have some of these in our present stocks. The smallest amount Digi-Key sells of these is a strip of ten, so we will have some left over. I think it good to make more than one of the recievers so we have a spare, unless money is ultra-tight.

    R1,R2,R4,       1K      311-1K ETC-ND
    R7,R17,R18,R19
    R3              1.8K    311-1.8K ETC-ND
    R5              4.7K    311-4.7K ETC-ND
    R6              47K     311-47K ETC-ND
    R8,R11          20K     311-20K ETC-ND
    R9              470     311-470 ETC-ND
    R10             680     311-680 ETC-ND
    R12,R13         2K      311-2.0K ETC-ND
    R14             10K     311-10K ETC-ND
    R15             1MEG    311-1.0M ETC-ND
    R16             100     311-100 ETC-ND

Pricing on these, per strip of 10, is 97 cents, so we are looking at $11 for resistors, unless we have some of these values on hand.

    C1                      82pF    311-1110-1-ND
    C2, C30                 27pF    311-1155-1-ND
    C3                      5PpF    311-1094-1-ND    These two are smaller
    C4                      2pF     311-1091-1-ND   ones, none in 1206
    C5                      15pF    311-1151-1-ND
    C6                      100pF   311-1161-1-ND
    C7,C8,C9,C10,
    C11,C12,C13,
    C17,C19,C26,C33,C41     0.1uF   311-1179-1-ND   12 total
    C14                     51pF    311-1219-1-ND
    C15                     120pF   311-1162-1-ND
    C16,C27, C34            10UF    PCS2106CT-ND    10 volt tantalums
    C18,C22,C25             100pF   311-1161-1-ND
    C20                     20pF    311-1153-1-ND
    C21                     10pF    311-1150-1-ND
    C23                     18pF    311-1152-1-ND
    C24,C28                 0.047uF 311-1178-1-ND
    C25                     100pF   311-1110-1-ND
    C29                     0.33uF  311-1180-1-ND
    C31                     22pF    311-1154-1-ND
    C32                     3-10pF  SG2021CT-ND

Note that I changed the value of C41, which is the audio output coupling capacitor from a .47 to a .1. I did this because the DTMF decoder is really sensitive and the output of this chip is about 8 times or so more than what that chip needs. Also, there was no surface mount .47 cap. The price per strip varies from about 65 cents up to slightly more than a dollar.

L1,L2 36-46 nH, SMT COIL DIGI-KEY [[TKS2713CT]]-ND

The originally spec'd part is NO LONGER AVAILABLE. I chose the closest equivalent part to it, though. They give a nominal L of 38 nf. Just how much we can tweak it is a good question... Ask Glenn if possible.

L3 TOKO QUAD COIL DIGI-KEY TK1302-ND [[RMC2A6597HM]]

L4 21-32nH, SMT COIL DIGI-KEY [[TKS2700CT]]-ND

Again, the originally spec'd part cannot be had. They have the right PART NUMBER, but the wrong specs. So, since I know oscillators like high q inductors (so they make nice sine waves, Duh, is this true?) I chose a ferrite core item. The brass core units have a lot lower Q, e.g.90 for the ferrite and about 60 for the brass core items. I just want to do this right. Again, check with Glenn. Note that all of the coils run several dollars each.

X1 10.245 MHz, 30PF PARALLEL MODE 300-8052-1-ND

X2 10.000 MHz, 30PF PARALLEL MODE 300-8051-1-ND

More amusement: NONE of the crystals in the [[DigiKey]] catalog have the 30 pf parallel mode spec. I just chose the most stable surface mount item they had, and it had 18 pf instead of 30, as do they ALL. If we really need special rocks (see Glenn about this term) we will need to order them special, and the lead time is pretty hairy, from what I hear. Again, ask Glen to see if this change is important. The crystals are about a dollar and a half.

F1 12.5 kHz 2 POLE XATL DIGI-KEY X701-ND FILTER, 10.7 MHz

F2 12 kHz CERAMIC FILTER DIGI-KEY TK2334-ND 455 kHz

FIL1-5 PANASONIC EMI FILTER DIGI-KEY [[P9809CT]]-ND

Another "Duh" kind of thing, but unless these things are really expensive I would rather put one wherever it says "5 volts filtered." I do want a sanity check, or rather checks, each step of the way. I do NOT want to have another clamp debacle, please Oh, and these will go on top of the board, but they still are small.Turns out they are dirt cheap, so a couple of extra ones for the reciever chip turns out to be trivial in the sceme of things, i.e. 30 cents each.

IC1 [[MC13135P]]

IC2 [[MC145170P]] [[MC145170D2]]-ND Surface Mount!!!

I found a combination of chips -- 2 of them -- that pretty much replaces the MC13135 part. They are the NE612 and NE614. Both are readily available surface mount... Save more room, simpler reciever. Best of all, these are the new improved versions, so they will be current for a while. As for the freq. Synth, I'd order more than one, if possible. This is a Cmos part and I may inadvertently pop it, don't know how sensitive it is...I live on the fourth floor and a ground wire is gonna be pretty long, etc. I may very well have popped some of the parts on the downconverters,but I was careful not to touch any leads except with a grounded soldering iron... The synth was about $5.

Q1,Q2 MPSH10, NPN, [[FMMTH10CT]]-ND Surface mount equivalent.

D1 MV104, VARICAP [[ZDC833ACT]]-ND Surface mount equivalent.

Note that the varicap seems to have a wider range, but am going to check it out anyway. If that is the case, the list is done and I can commence learning the high strangenesses of Eagle. It looks like our total parts costs are going to be under $100 -- there are things needed that aren't on this list, and at least one item on this list I have no clue as to it's price.

Looks like the slightly higher inductance of the inductor used in the oscillator cancels out the slightly lower capacitance of the varactor. Again, suggestions are wanted. Glenn, HELP?!!!

It really does look like the 2" x 3" x 3/4" dimensions are very likely.

[[DennisYoung]] - 22 Feb 2003.

The new schematic, or rather, the cleaned up one, is at <http://www.ece.pdx.edu/~dy/reciever.pdf> (ADG: and attached below) There is also a postscript file, but the .pdf file is smaller and will work in both acrobat and ghostview, so get that one. Am having considerable trouble with EAGLE, but will be able to both learn enough to do the board (need more input, hope to get it tonight) **and** generate some really good notes. I will need them. [[DennisYoung]] - 01 Apr 2003.

Checked out the written notes, and they are as suspected. I also downloaded the most current version of the "PSAS" library, and found the tape I recorded of the night the workshop was given. It looks like I will end up writing a tutorial after all -- transcribe the tape, add it to what I have, then add in things as I work on this schematic/board combo. I need to print out the schematic, will do that tomorrow when I can get to school. Present printer dead. [[DennisYoung]] - 02 Apr 2003

I had the dubious privelege of being sick for an entire month and then had computer problems. I am back up and running. I discussed matters with Tim re use of Eagle and we discussed the possibliliy (screwed up spelling, drat!) of using the router, as this is a very simple board. Problem is, I lost everything in the process of upgrading, horrible mess -- hardware dying, need job to finish school(actually to pay new medical bills) and buy computer parts to put together something less ancient. But I am making progress. I beat on the computer for about a week to ensure it would do the job prior to resuming work on this stuff. After, I will be able to build the board(s) -- I think we want a spare if money is available. This board is the same size as mentioned, and expet a new schematic and layout of board within a day or two. Then, I will suppy materials to Tim and we can make boards. I would like to tin them, though. Glen, are you there? Will tin make the RF unhappy? Silver won't, I know -- but that setup would cost over 50 dollars.

[[DennisYoung]] - 01 Jun 2003