Cobra 148 Tuning Cans.

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Tim
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Cobra 148 Tuning Cans.

Post by Tim » 22 Apr 2018, 10:21

Can anyone furnish me with what value each of the cans are?, I believe L16 is 100uM but need to know what all the rest are, mate of mine has one that someone has destroyed the cores on some and superglued in the others so they all need replacing. Thanks all. It's the MK11 PB-010A.

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cb4ever104
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Re: Cobra 148 Tuning Cans.

Post by cb4ever104 » 22 Apr 2018, 11:20

I emailed "Toko" (now Murata) a while back asking them if they could give me technical information on their inductors from the late 70s/early 80s. They eventually got back to tell me that they didn't keep part records that far back . So I don't think you'll find that information anywhere . But you never know .

My advice is to get a scrap board . Any old Uniden or Ranger one will do and get the parts from that .
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Tim
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Re: Cobra 148 Tuning Cans.

Post by Tim » 22 Apr 2018, 16:00

Hmmm, I don't think robbing them from any old Uniden or Ranger would serve the purpose as the uM values of each and their position on the board would still need to be known, no good putting a 100uM can where a 470uM should be but thanks for the suggestion.

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cb4ever104
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Re: Cobra 148 Tuning Cans.

Post by cb4ever104 » 22 Apr 2018, 16:49

First of all L16 isn't "tunable" . It's a fixed inductor . Manual says 100uH . That's Henrys . There's no M in that . 90% of the cans in a 148 GTL-DX are used in similar radios from the same era . When I said an old scrap board , obviously I'm not talking about some old Uniden 40 channel AM radio . I'm talking similar Uniden , or Ranger EPT36001X multimode SSB boards . Nearly all of the "tunable" cans in these export radios are the same . The VCO ones might be slightly different in some , but the 10.965 , RX and TX stages are more or less the same . Hope that clarifies things .
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Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

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DX-Digger
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Re: Cobra 148 Tuning Cans.

Post by DX-Digger » 22 Apr 2018, 20:49

ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ

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Re: Cobra 148 Tuning Cans.

Post by cb4ever104 » 23 Apr 2018, 08:26

DX-Digger wrote:
22 Apr 2018, 20:49
Maybe G4CFY can help.
http://www.spectrumcomms.co.uk/Components.htm
Thanks . Forgot about them . They'll be fine for the main IF and mixer stages . The small local oscillator ones are harder to come by .
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

zephyr
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Re: Cobra 148 Tuning Cans.

Post by zephyr » 23 Apr 2018, 21:07

You can find all the tuning coil numbers on the mk2 schematic on CBTricks.

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astradyne
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Re: Cobra 148 Tuning Cans.

Post by astradyne » 24 Apr 2018, 14:03

I have a complete scrap MK2 PCB here. It's minus the PLL, regulators, outputs etc but all the tuning cans are present.
Never, ever, ever....bloody anything ever!

Far too many radio's to list here. But I do own a legal one...

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