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VK2ZRG > NEED 12.04.05 01:43l 49 Lines 1397 Bytes #999 (0) @ WW
BID : 1277_VK2ZRG
Read: GUEST
Subj: Re: Motorola MRF 245 data
Path: DB0FHN<DB0NOE<DB0GAP<DB0FSG<DB0MRW<DB0WUE<DK0WUE<7M3TJZ<SV1CMG<I0TVL<
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Sent: 050411/0808Z @:VK2WI.#SYD.NSW.AUS.OC #:65087 [SYDNEY] FBB7 $:1277_VK2ZRG
From: VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
To : NEED@WW
VK2ZRG/TPK 1.83d Msg #:1277 Date:11-04-05 Time:9:06Z
>R:050406/1612z @:DB0FRB.#BW.DEU.EU [TheBox 1.9c1 REV.5 ] DB19c1 $:645DB0FRB005
>From: DO1GUM @ DB0FRB.#BW.DEU.EU (Ulrich C.)
>To: NEED @ ALL
>
>Hi All,
>i'm looking for a datasheet of the old transistor Motorola MRF 245.
>Is there anybody out there who is able to help me????
>Many thank to you.
>73 de Ulrich C., DO1GUM, A05
>
Hello Ulrich
The MRF245 is similar to the MRF247 except that the gain is around 1 dB less,
however the MRF247 is not listed as a similar replacement in a cross reference
list. Some brief data may be found in the ARRL Handbook.
Here is the data from a 1980 Motorola RF Data Manual for a MRF245.
80 watt, 175 MHz controlled Q RF Power transistor Case 316-01
Minimum gain at 175 MHz/80 watts = 6.4 dB
VCEO 18 volts
VCBO 36 volts
VEBO 4 volts
Peak IC 20 amps
250 watts total device dissipation at TC = 25 Celesius
Thermal resistance junction to case = 0.7 deg C/watt
Output capacitance = 250 pF maximum
Typical performance at 145 MHz is 80 watts out with 10 watts drive
with a Vcc of 12.5 volts. Collector efficiency = 60%
Hope that helps.
73s from Ralph VK2ZRG@VK2WI.#SYD.NSW.AUS.OC
/ack
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