On the other side of the coin I have been looking forward toward the
144mhz option for use as an IF to drive my 2 meter IF microwave transverters.
Whether the output be 25 or 50 watts it would be nice to have the capability to
bypass the final stage in order to supply about 1 watt of drive for external
transverters. I’m sure I’m not the only one planning to use external
transverters. That’s sure a lot simpler than trying to attenuate 50 watts in
the transmit path without affecting the receive path. I realize that the drive
level may be software variable, but the possibility of the setting
inadvertently changing either through operator error or through a software
glitch is risky. Also, I don’t know if this is true for the flex, but some
radios when set for low power produce an initial high power pulse upon keying
which is also a concern.
Jim
K5HY
> From: [EMAIL PROTECTED]
> To: flexradio@flex-radio.biz
> Date: Tue, 1 Jul 2008 09:06:53 -0700
> Subject: Re: [Flexradio] 144 and 432 - Low Power Design?
>
> I'd like to add my vote for 50W on the 2M/432 PA. I've been holding off on
> my purchase of the 5000 waiting for the 2M/432 module. However, 25W won't
> drive my amps to legal limit. For that matter, I don't know of any 2M or
> 432 legal limit amps that can provide full power with only 25W drive.
> 35-45W is typical. I don't want to have to add a brick for 2 dB more power.
> The 2M/432 power output will probably be the major determining factor in my
> decision to buy the 5000. Look at the competing rigs (IC-910 and TS-2000).
> They both do 50W or more on these two bands. Even the IC-7000 does 35W on
> 432. I am confident that the 5000 receiver is better than any of these
> radios, but I need the TX side of things to be acceptable also.
>
> 73,
> Clay W7CE
>
> ----- Original Message -----
> From: "John"
> To: "'Mike Valentine'" ;
> Sent: Tuesday, July 01, 2008 7:29 AM
> Subject: Re: [Flexradio] 144 and 432 - Low Power Design?
>
>
>> Mike,
>>
>> The initial design called for a 25w PA on both bands; however, we have not
>> yet finalized the design. We will reevaluate.
>>
>> John P. Basilotto
>> W5GI
>> Chief Operating Officer
>> Marketing and Sales
>> Office 512 535-5266
>> Fax 512-233-5143
>> 13901 Pond Springs Rd
>> Suite 250
>> Austin, TX 78729
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Mike Valentine
>> Sent: Tuesday, July 01, 2008 6:29 AM
>> To: flexradio@flex-radio.biz
>> Subject: [Flexradio] 144 and 432 - Low Power Design?
>>
>>
>>
>> -----Original Message-----
>> From: Mike Valentine
>> Sent: Monday, June 30, 2008 6:02 PM
>> To: '[EMAIL PROTECTED]'
>> Subject: 144 and 432 - Low Power Design?
>>
>> Tim,
>>
>> Regarding 2M and 432 transverters, I am disappointed to understand that
>> they will be 25 watt output efforts. Is this still true?
>>
>> When one is contemplating high performance VHF or UHF stations, high
>> power final amplifiers are de rigueur. A transverter with 25 watts
>> output needs an inter-stage amplifier (with attendant signal quality
>> degradation and potential amp-chain instability) to adequately drive a
>> kilowatt amplifier of the ordinary 2-hole type.
>>
>> Much, much better would be 50 (or more) watts output from the
>> transverter to directly drive a tube-type final amplifier.
>>
>> One may complain that there are no easy-to-engineer solutions in this
>> power output level. Down East Microwave produces "high power" versions
>> of their transverters that produce 60 watts on 144 or 222 and 50 watts
>> on 432 using commercial RF power modules. The "HP" versions cost more
>> than the 10 to 25 watt styles, but they are so much cheaper and such a
>> better solution than putting a beefy solid-state amp between the
>> transverter output and amplifier and hoping for the best. I've done it
>> both ways and the high-power transverter is my proven favorite. Oh that
>> Flex would do it, too!
>>
>> Does Flex have any comments on the subject of transverter output power?
>>
>> Cheers,
>>
>> Mike - W8MM
>> Cincinnati
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Tim Ellison
>> Sent: Monday, June 30, 2008 10:09 AM
>> To: Alan NV8A; Flexradio
>> Subject: Re: [Flexradio] Prices
>>
>> As for #2, there is no pricing information for the addition of 144/440
>> capability to the FLEX-5000 yet.
>>
>>
>>
>> -Tim
>>
>> _______________________________________________
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>> Knowledge Base: http://kb.flex-radio.com/ Homepage:
>> http://www.flex-radio.com/
>>
>>
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>> Knowledge Base: http://kb.flex-radio.com/ Homepage:
>> http://www.flex-radio.com/
>>
>
>
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