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KG6BAJ > NWSGRP 04.10.09 05:15l 55 Lines 2073 Bytes #999 (0) @ WW
BID : 12283_N1OES
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Subj: Re: 30 meter mod for a Kenwood TS-520
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Sent: 091003/2000Z @:KG6BAJ.#NCA.CA.USA.NOAM #:12283 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.equipment
** FROM : Michael Black <et472@ncf.ca>
On Sun, 4 Oct 2009, Jack Pagel wrote:
> Fred McKenzie wrote:
>> In article <YY3wm.2947$cW.944@newsreading01.news.tds.net>,
>> Jack Pagel <nz9u@tds.net> wrote:
>>
>>> Was there ever a modification that will enable transmit on 30 meters?
>>> Thanks,
>>
>> Jack-
>>
>> As I understand the TS-520, it has tuned circuits plus a heterodyne crystal
>> for each band. You could sacrifice 40 Meters, retune the coils for 30
>> Meters, and change the 40 Meter heterodyne crystal for one that is 3 Mhz
>> higher. In theory, it would then tune from 10.0 MHz when the dial
>> indicated tuning from 7.0 MHz.
>>
>> Retuning the coils might be as simple as changing a tap on a coil or
>> replacing a capacitor in a parallel-tuned circuit. Doesn't the TS-530 have
>> the WARC bands included? You might look at it for ideas on how best to
>> modify the TS-520.
>>
>> Be careful, since you could easily end up transmitting outside the Ham
>> bands!
>>
>> 73,
>> Fred
>> K4DII
>
> I just picked up a TS-520 at a local hamfest. It receives 30 meters with no
> problem, with the WWV monitor switching, so I thought it may not be so
> difficult to add the transmit too. I read about someone doing that with a
> TS-180, which I know nothing about those radios. Years ago I took out 40 and
> put in 30 meters on a HW-8 QRP rig. It was easier going up frequency than it
> would have been if I took out 20 meters instead.
>
Maybe. Certainly you're part way there. There's the position on the
bandswitch, the crystal oscillator and low level tuned circuits.
The key part may be that there's no contacts for the transmitter tuned
circuits on the bandswitch. So there's no place to solder tuned circuits
for transmitting. So you have to find a similar switch with similar
contacts and transplant them into the rig, then add the tuned circuits.
Michael VE2BVW
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