42IF122 Transformer - Page 1
Forum section: electronics / general

author: christopher iles
author_rank: Regular Contributor
timestamp: January 04, 2017, 07:39:02 am
content: Hello and happy new year.Do you have any 42IF122 10.7MHz IF transformers for sale please?I need three of them for my MMR 40 transceiver build.Regards,Chris, G0VOE. Somerset, England.

author: CJay
author_rank: Super Contributor
timestamp: January 04, 2017, 10:34:59 am
content: These look very similar to Toko IF transformers, have you tried Tony Nailer at Spectrum Communications or the GQRP Club to see if there's an alternative (Spectrum's 2u6L looks like a possible and they're also carried by GQRP Club sales)?It may also be possible to pull something suitable from old radios (I've got a full shelf of scrap PMR, CB and other transceivers so may be able to help), I think you'd need three of them?

author: christopher iles
author_rank: Regular Contributor
timestamp: January 04, 2017, 11:53:12 am
content: Thank you for the fast reply. I can't find the 42IF122 anywhere but have some KANK3334 transformers which if I remember rightly are around 5uH, 4 -14 MHz.Maybe they'll work.Kind regards,Chris.

author: CJay
author_rank: Super Contributor
timestamp: January 04, 2017, 02:02:38 pm
content: There's a spec sheet here:http://www.kitsandparts.com/42IF122.htmThe 3334 seems to have 4 turns on the secondary, the original only one, it may work with some tweaking, definitely worth a try.

author: SingedFingers
author_rank: Frequent Contributor
timestamp: January 05, 2017, 10:33:09 am
content: My heart always sinks when something involves playing "find the IF transformer". I really wish people would just use Amidon cores and standard trimmers in their kits and be done with it.Spectrum's Toko replacements are however wonderful as is their service generally. I recently built the 40m bandpass described in QRP Basics with their IF cans and it just worked.Did the receiver. Now for a license, and then a transmitter!

author: CJay
author_rank: Super Contributor
timestamp: January 05, 2017, 12:00:31 pm
content: Me too, I managed to find an estate car's worth of 'scrap' stuff from a radio tech who is fairly local to me so I'm pretty well set up for HF and VHF bits to salvage but it's always a case of fingers crossed when it comes to transformers, it's very rare to find one that's not marked up with a 'house' part number.Similar on the license as well, it's a case of finding the time on a weekend to do the exams and have a practical assessed.

author: SingedFingers
author_rank: Frequent Contributor
timestamp: January 05, 2017, 12:55:23 pm
content: That's a pretty handy haul!I can probably do the foundation exam now but they're run by amateur radio clubs apparently and I didn't pick this interest for the rag chewing - just want in, tick the boxes, out and home

author: CJay
author_rank: Super Contributor
timestamp: January 05, 2017, 05:04:57 pm
content: Very handy, some of it wasn't 'scrap' and I've resurrected a fair few pieces of equipment out of the pile, he retired and just gave it all away, I was in the right place at the right time for once.I tried to contact three local clubs at the start of last year about the exam, one replied and has been really helpful but I just can't make their timetable work, the other two, yeah, still waiting for a reply.And they wonder why new licensee numbers are falling.

author: SingedFingers
author_rank: Frequent Contributor
timestamp: January 05, 2017, 05:50:59 pm
content: Excellent. That's a rarity in this day and age.That sounds like a veritable nightmare. I am slightly worried about this process actually and that sort of matches my concerns. I was going to try and track a human down at the Kempton Rally in April. Guildford and Harrow are the closest two clubs - there is a complete vacuum around me unfortunately.I'm wondering how long it'll be before pirate QSOs are the norm. Deregulation tends to happen when things drop like that.

author: christopher iles
author_rank: Regular Contributor
timestamp: January 08, 2017, 09:43:16 am
content: Hello again,Just to confirm that I tried a kank3334 in the receive part of the radio and it tunes up fine with no modifications!Cheers,Chris.

author: SingedFingers
author_rank: Frequent Contributor
timestamp: January 08, 2017, 11:48:20 am
content: Excellent - glad to hear a success story

author: CJay
author_rank: Super Contributor
timestamp: January 09, 2017, 10:04:12 am
content: Quote from: christopher iles on January 08, 2017, 09:43:16 amGood to know.